KR101710300B1 - Method of repairing bridge surface pavement using ultra rapid hardening latex modified concrete with enhanced freezing and thawing durability, salt damage resistance and crack resistance - Google Patents

Abstract

The present invention relates to a bridge surface pavement and repair method using rapid latex modified concrete. More specifically, physical characteristics such as bending strength, tensile strength, and compression strength are realized at an early stage in a repairing process of damaged pavement of a bridge surface. Therefore, the present invention minimizes a traffic control period, has excellent adhesion with the existing pavement, and removes a crack and separation. More specifically, the present invention has enhanced resistance with respect to freezing-thawing and salt to have excellent long-term durability and removes limitation of a usage period of a repair agent. Moreover, the present invention is conveniently used in a site and prevents a loss of a material and environmental pollution.

Description

TECHNICAL FIELD [0001] The present invention relates to a method for repairing and paving bricks using a quick-setting latex modified concrete having improved resistance to freezing, thawing, and cracking resistance, }

The present invention relates to a method of repairing pavement pavement using ultra rapid latex modified concrete, more specifically, since it can secure initial strength in a short time, construction can proceed quickly, traffic interruption can be minimized, And is excellent in long-term strength and durability so that the maintenance effect can be maintained for a long time.

Asphalt concrete roads are widely used because of their many advantages such as easy work, quick opening of traffic and comfortable ride. However, the above-mentioned asphalt concrete road has a characteristic of being sensitive to climate, so that cracks occur frequently and it is vulnerable to water, resulting in a large number of potholes, which often hinders safe running of the vehicle and smooth traffic communication. Also, in the case of cement concrete road, the road breakage caused by the joint cutting part occurs frequently due to the characteristics of the road.

Damage of such road pavement is mainly caused by snowfall or rainfall, and it may lead to accidents during driving due to the flatness caused by this, so urgent repair should be done.

Especially, in the case of bridges, the effects of plastic deformation due to heavy traffic and damage due to impact, climate change due to regional characteristics, effects on freezing and thawing, influence of deflection vibration in long bridges, It is easy to cause damage due to the corrosion of the reinforcing steel caused thereby and the acceleration of the damage of the bridge top concrete.

If the bridge pavement is damaged as described above, it is necessary to remove the damaged part and repair the part. Especially, when the bridge is closed for a long period of time, traffic congestion occurs. Therefore, There is a need. Also, it should have excellent bonding with existing pavement, long-term strength and durability are excellent, and maintenance effect should be maintained for a long time.

Conventional bridge repair method is mainly used for asphalt overlay and polymer concrete thin layer pavement maintenance method. However, it takes a long time to work, poor bonding with existing pavement, and poor strength and durability, there was.

As a technique for solving such a problem, Korean Patent Registration No. 10-0806849 discloses a method in which the upper package of the base layer is crushed and the base layer is cut by using high-pressure spraying, and then the concrete is laid and cured to repair the cross- Method. In this method, a thin layer of latex modified mortar is applied before concrete is poured, and concrete is laid on it to form a maintenance layer with excellent bonding strength. However, the method proposed in the present invention is not a method which is significantly different from a general bridge maintenance method used in the prior art, and also in the case of latex modified mortar, the initial strength development speed is not fast, have.

On the other hand, Korean Patent No. 10-0403979 proposes a method for preparing a quick-setting latex modified concrete composition for emergency repair of a bridge top plate. In this technique, the defoaming agent is injected at a certain rate relative to the latex resin to remove the air, thereby enhancing the internal strength and decreasing the porosity, thereby lowering the possibility of breakage to freezing and thawing. However, it is difficult to extract air by injecting defoaming agent, which is not a general technique as a general technique in the repairing method using a mortar, and it is difficult to say that the defoaming agent shortens the curing period, manifests initial strength and strengthens the strength.

The present invention has been developed to overcome the limitations of the above-described conventional techniques, and it is an object of the present invention to minimize the period of traffic control by repairing damaged pavement pavement with physical characteristics such as bending strength, tensile strength and compressive strength, It has excellent durability against long-term durability because it is excellent in bonding with existing packaging and is free from cracking and peeling. Especially, it is resistant to freeze-thaw and salt- And to provide a repair method of a pavement pavement having characteristics that can prevent material loss and environmental pollution.

As a means for solving the above-mentioned problems,

(a) preparing a masonry composition for repairing a masonry packing, wherein the masonry composition for repairing the masonry packing comprises

(1) 50 to 100 parts by weight of cement, 0.5 to 10 parts by weight of clinker, 0.5 to 10 parts by weight of plaster, 0.5 to 10 parts by weight of alpha type hemihydrate, 0.1 to 5 parts by weight of silica fume, 0.01 to 5 parts by weight of fly ash, 10 to 70% by weight of a first powder component comprising 0.5 to 10 parts by weight of limestone, 1 to 20 parts by weight of blast furnace slag, 0.01 to 10 parts by weight of calcined pozzolan and 0.01 to 10 parts by weight of microsilica; 0.05 to 0.2 parts by weight of a viscosity enhancer, 0.3 to 1.1 parts by weight of a fluidizing agent, 0.1 to 0.5 parts by weight of a curing accelerator, 0.1 to 0.4 parts by weight of a retarding agent, 2 to 7 parts by weight of a siliceous waterproofing agent, 5 to 15 parts by weight of a CSA- And 42 to 64 parts by weight of silica sand and 30 to 90% by weight of a second powder component comprising 100 parts by weight of the powder component.

(2) One or more powder or liquid rubber selected from ethylene-vinyl acetate (EVA) resin, NR (natural rubber) resin, NBR (natural rubber-butadiene rubber) resin and SBR 1 to 20 parts by weight of a modified latex component obtained by mixing a resin with cement-like quick-setting cement, carbon black and fibers;

(3) 1 to 7 parts by weight of methyl methacrylate, 5 to 20 parts by weight of styrene monomer, 1 to 10 parts by weight of n-butyl acrylate, 0.1 to 10 parts by weight of methyl acrylate, 0.1 to 10 parts by weight of isobornyl acrylate, 0.05 to 5 parts by weight of an initiator and 0.05 to 5 parts by weight of an emulsifier;

(4) 1 to 10 parts by weight of a hydrophilic polyvinyl alcohol short fiber component;

(5) 1 to 5 parts by weight of an additive component comprising a mixture of a preservative, an antifoaming agent and a humectant; And

(6) 10 to 50 parts by weight of water, 5 to 50 parts by weight of the filler and 10 to 40 parts by weight of the filler and 20 to 70 parts by weight of the aggregate, Preparing a masonry composition for maintenance of a pavement packing;

(b) crushing the fractured portion of the pavement package, but partially breaking only the upper portion of the pavement so that the inner pavement is not damaged;

(c) cutting the shredded portion by high pressure spraying and removing foreign matter present on the cutting surface;

(d) placing a mortar composition for repairing a pavement packing prepared in the step (a) on a cut surface from which the foreign matter is removed; And

(e) curing and finishing the surface of the poured masonry repair mortar composition;

The present invention provides a method for repairing a pavement of a pavement.

In order to achieve the above object,

In one embodiment of the present invention, the mixture of 100 parts by weight of the natural pozzolana of the above (1) and 1 to 20 parts by weight of calcium is calcined at 1000 to 1200 ° C. for 0.5 to 1 hour, Is in the range of 10 to 20 占 퐉.

Further, according to an embodiment of the present invention, the (d) in 100 ~ 300g / m ² primers prior to placing the bridge deck package repair mortar composition prepared in the above (a) to a cutting surface of said foreign substance removing In a range of from 0.1 to 10 mu m.

Further, in one embodiment of the present invention, the fluidizing agent contained in the second powder component of the powder component is characterized by using a naphthalene-based, melamine-based or polycarboxylic-acid-based fluidizing agent.

Further, in one embodiment of the present invention, the coating agent may further include 10 to 50% by weight of an epoxy resin, 10 to 50% by weight of a polymethylmethacrylate resin 1 to 20% by weight of an inorganic filler, 0.1 to 5% by weight of an accelerator, 0.05 to 20% by weight of an emulsifier and 10 to 80% by weight of water are mixed in an amount of 5 to 40% by weight, a diluent of 1 to 25% 1 to 10% by weight of an emulsifier, 5 to 20% by weight of an accelerator, and 50 to 90% by weight of water are mixed with 100 parts by weight of the main component of the aqueous solution And 5 to 50 parts by weight of a polyamide and 0.1 to 40 parts by weight of an amine compound based on 100 parts by weight of an epoxy resin.

According to the present invention, an acrylic mixed resin is used for repairing a damaged portion of a pavement pavement, and a clinker, a plaster, an alpha type semi-gypsum, a silica crumb, fly ash, limestone, blast furnace slag, calcined pozzolan, It has excellent physical properties such as bending strength, tensile strength and compressive strength, and has excellent adhesion with existing pavement pavement, excellent chemical resistance and waterproof property, excellent resistance to freezing and thawing and salt corrosion , A siliceous waterproofing agent, a CSA-based swelling agent, and a fluidizing agent, the mortar curing rate can be greatly improved and the waterproof effect can be enhanced. In addition, the effect of improving the initial strength can be remarkably increased by including the modified latex rubber type resin component. Further, the physical properties are further enhanced by making the internal structure more dense by using the monomer component, the initiator component and the emulsifier, It is possible to secure the strength, which can dramatically shorten the working time, minimize the traffic control time, and significantly improve the resistance to freezing and thawing and salting, so that the maintenance effect can be maintained for a long period of time.

Hereinafter, the present invention will be described in detail.

First, the repair process of the pavement packing according to the present invention comprises the following five steps. In other words,

Step 1: Preparation of Mortar Composition for Repairing Pavement Pavement

Step 2: Breakage of the pavement package Partial crushing step

Step 3: High Pressure Cutting and Removal of Foreign Material

Step 4: Putting Mortar Composition for Maintenance of Pavement Pavement

Step 5: Mortar composition curing and surface finishing step

Hereinafter, each of the above steps will be described in detail.

First, the preparation of the masonry composition for maintenance of the pavement packing in the first step is prepared by mixing the following six components to prepare a repairing agent, mixing 10 to 40 parts by weight of the filler and 20 to 70 parts by weight of the aggregate.

That is, the repairing agent according to the present invention

(1) 50 to 100 parts by weight of cement, 0.5 to 10 parts by weight of clinker, 0.5 to 10 parts by weight of plaster, 0.5 to 10 parts by weight of alpha type hemihydrate, 0.1 to 5 parts by weight of silica fume, 0.01 to 5 parts by weight of fly ash, 10 to 70% by weight of a first powder component comprising 0.5 to 10 parts by weight of limestone, 1 to 20 parts by weight of blast furnace slag, 0.01 to 10 parts by weight of calcined pozzolan and 0.01 to 10 parts by weight of microsilica; 0.05 to 0.2 parts by weight of a viscosity enhancer, 0.3 to 1.1 parts by weight of a fluidizing agent, 0.1 to 0.5 parts by weight of a curing accelerator, 0.1 to 0.4 parts by weight of a retarding agent, 2 to 7 parts by weight of a siliceous waterproofing agent, 5 to 15 parts by weight of a CSA- And 42 to 64 parts by weight of silica sand and 30 to 90% by weight of a second powder component comprising 100 parts by weight of the powder component.

 (2) One or more powder or liquid rubber selected from ethylene-vinyl acetate (EVA) resin, NR (natural rubber) resin, NBR (natural rubber-butadiene rubber) resin and SBR 1 to 20 parts by weight of a modified latex component obtained by mixing a resin with cement-like quick-setting cement, carbon black and fibers;

(3) 1 to 7 parts by weight of methyl methacrylate, 5 to 20 parts by weight of styrene monomer, 1 to 10 parts by weight of n-butyl acrylate, 0.1 to 10 parts by weight of methyl acrylate, 0.1 to 10 parts by weight of isobornyl acrylate, 0.05 to 5 parts by weight of an initiator and 0.05 to 5 parts by weight of an emulsifier;

(4) 1 to 10 parts by weight of a hydrophilic polyvinyl alcohol short fiber component;

(5) 1 to 5 parts by weight of an additive component comprising a mixture of a preservative, an antifoaming agent and a humectant; And

(6) 10 to 50 parts by weight of water.

Hereinafter, the main components of the composition will be described in detail.

First, in the present invention, the powder component is a mixture of a first powder component and a second powder component, wherein the first powder component is a component serving as a binder and the second powder component is a component . ≪ / RTI >

The cement contained in the first powder component of the powder component according to the present invention is formed so as to increase strength such as initial compressive strength, flexural strength, adhesive strength, and shorten the curing time. Specifically, the above-mentioned cement component may be a general portland cement, or may be a mixture of a quick-speed cement, an alumina cement, an awwin cement, and the like.

In the present invention, the clinker contained in the first powder component of the powder component is composed of calcium silicate, alite, berylite, celite and the like. The clinker serves to promote the mixing of the binder and water. If the content of the clinker is less than 0.5 parts by weight, mixing of the binder and water is not easy. When the amount of the clinker is more than 10 parts by weight, the content of the clinker is preferably in the range of 0.5 to 10 parts by weight, There is a problem that the strength is lowered.

In addition, in the present invention, the gypsum contained in the first powder component of the powder component serves to improve the adhesion by increasing the viscosity when the binder is mixed with water. It is preferable that the gypsum is contained in the first powder component in the range of 1 to 10 parts by weight. When the content of the gypsum is less than 1 part by weight, the problem that the viscosity and adhesion of the repairing agent according to the present invention is lowered If it exceeds 10 parts by weight, there is a problem that the strength is lowered.

In addition, in the present invention, the plaster included in the first powder component of the powder component serves to easily mix the components contained in the binder with water. When the content of the plaster is less than 0.5 parts by weight, the various components contained in the binder are easily mixed with water. There is a difficult problem, and when it exceeds 10 parts by weight, the strength and chemical resistance are deteriorated.

Further, in the present invention, the alpha-hemihydrate gypsum contained in the first powder component of the powder component is obtained by heating the alumina solu- tion at a temperature of about 75 to 100 ° C under a reduced pressure of not less than -600 torr for not less than 1 hour, The alpha type hemihydrate gypsum is produced by heating with alpha type hemihydrate gypsum. When the alpha type hemihydrate gypsum is mixed with cement, the shrinkage expansion rate is almost zero, and cracks due to shrinkage expansion are suppressed. More specifically, in general, gypsum is largely divided into natural gypsum and chemical gypsum. The purity is determined according to the content of SO ₃ , and the gypsum gypsum is divided into the gypsum gypsum, half gypsum and anhydrous gypsum do. It is transformed into alpha type, beta type or anhydrous gypsum depending on the dehydration condition. It is transformed into beta type when dehydrated in a dry state, and alpha type when dehydrated in a wet state. Alpha-type hemihydrate gypsum has more than 10 times more strength than beta-type hemihydrate gypsum, has a short initial curing time, and has the effect of suppressing cracks due to expansion and shrinkage. In addition, the alpha-type hemihydrate gypsum plays a role of strengthening the high strength, quickness and expandability together with the CSA type expanding agent described later, and it plays a role of supplementing the disadvantage of the CSA type expanding agent.

In the present invention, it is preferable that the alpha-hemihydrate gypsum is contained in the first powder component in the range of 0.5 to 10 parts by weight. When the content of the alpha-hemihydrate gypsum is less than 0.5 part by weight, If the amount is more than 10 parts by weight, the reaction speed is increased and the pot life is shortened.

In the present invention, the silica fume contained in the first powder component of the powder component is an amorphous active silica having an average particle diameter of about 0.15 mu m and is a nearly spherical particle. Silica fume improves water resistance and chemical resistance by filling effect between binder particles due to the characteristics of spherical particles, and improves the strength of the filler. In particular, silica fume also plays a role in improving the adhesion performance of the repair agent. It is preferable that the silica fume is contained in the range of 0.1 to 5 parts by weight in the first powder component. When the content of the silica fume is less than 0.1 part by weight, the water repellency and chemical resistance of the filler are lowered, There is a problem, and when it exceeds 5 parts by weight, cracks may occur.

In addition, the fly ash contained in the first powder component of the powder component in the present invention (fly ash) is silicon burning coal in facilities that use coal-fired power plants the fuel remaining components remain in the oxide form oxide (SiO ₂ ) Or aluminum oxide (Al ₂ O ₃ ) component. When the fly ash is mixed with concrete, workability is improved, curing heat is lowered, and long-term strength and water tightness are improved, which is economical. It is preferable that the fly ash is contained in the first powder component in the range of 0.01 to 5 parts by weight. When the content of the fly ash is less than 0.01, the adhesion performance of the filler is deteriorated. When the fly ash is more than 5 parts by weight There is a problem that the chemical resistance is lowered.

In addition, the limestone included in the first powder component of the powder component in the present invention plays an auxiliary role in improving the adhesion of the repairing agent according to the present invention. It is preferable that the limestone is contained in the first powder component in the range of 0.5 to 10 parts by weight. When the content of the limestone is less than 0.5 part by weight, the effect of improving the adhesion of the repairing agent is lowered, There is a problem that the chemical resistance is deteriorated.

In the present invention, the blast furnace slag included in the first powder component of the powder component is a by-product generated in the process of manufacturing steel in an ironworks or the like. The main component of the blast furnace slag is alumina silicate. When the blast furnace slag is mixed with the binder, And serves to enhance the durability and chemical resistance of the repair agent. In particular, the blast furnace slag has a low water permeability and serves to improve the water resistance of the repair agent according to the present invention and to improve the resistance to freezing and thawing and salting. It is preferable that the blast furnace slag is contained in the first powder component in the range of 0.01 to 5 parts by weight. When the content of the slag is less than 0.01 part by weight, the durability, chemical resistance, water resistance, There is a problem that the resistance is lowered. When the amount exceeds 5 parts by weight, cracking of the repairing agent may occur and there is a problem that the weight of the repairing agent increases.

In the present invention, the calcined pozzolana contained in the first powder component of the powder component is prepared by adding calcium to natural pozzolana, which is mainly composed of fine red, volatile acid earth, To improve the water resistance of the repair or reinforcement according to the present invention. Specifically, a mixture obtained by mixing 100 parts by weight of natural povolacne with 1 to 20 parts by weight of calcium is calcined at 1000 to 1200 ° C. for 0.5 to 1 hour and then pulverized to have an average particle size of 10 to 20 μm . When the above-mentioned treated soapollane is applied to the mortar, it enhances the denseness of the tissue to increase water resistance and strength. It is preferable that the lower pozzolana is contained in the first powder component in a range of 0.01 to 5 parts by weight. When the content of the lower pozzolana is less than 0.01 part by weight, the water repellency of the repair agent is lowered and more than 10 parts by weight There is a problem that the strength of the repairing agent is lowered.

Also, in the present invention, the microsilica contained in the first powder component of the powder component is silica particles having a particle diameter of 10 to 200 탆, and serves to improve the strength and chemical resistance of the filler according to the present invention. If the content of the microsilica is less than 0.01 part by weight, the strength and chemical resistance of the filler deteriorate, and if the content of the microsilica exceeds 10 parts by weight There is a problem that the adhesion performance of the repair agent is deteriorated.

In the present invention, the second powder component of the powder component is used for minimizing side effects and improving the performance when the first powder component is used.

In the present invention, the siliceous waterproofing agent contained in the second powder component of the powder component improves the waterproofing property by chemically and physically filling the pores of the cemented product and making it densified. If the amount of the siliceous waterproofing agent is less than 2 parts by weight, the waterproof effect is insignificant. When the amount of the silicate-based waterproofing agent is more than 7 parts by weight, So that the physical properties are reduced.

In the present invention, it is preferable that the CSA (Calcium sulphoaluminate) based expansion agent contained in the second powder component of the powder component is included in the range of 5 to 15 parts by weight of the second powder component. If the content of the CSA-based expanding agent is less than 5 parts by weight, the effect of shrinkage reduction is insignificant. If the amount exceeds 15 parts by weight, expansion occurs to cause destruction of the cured body and physical properties such as strength may be deteriorated.

 In the present invention, the viscosity enhancer contained in the second powder component of the powder component may be a cellulose-based thickener, a starch-based thickener, or the like. In the present invention, the viscosity enhancer is preferably included in the second powder component in the range of 0.05 to 0.2 part by weight. If the amount is less than 0.05 part by weight, separation of the material may occur. If the amount is more than 0.2 part by weight, And the construction quality may be deteriorated.

In the present invention, the fluidizing agent contained in the second powder component of the powder component may be a fluidizing agent such as naphthalene-based, melamine-based, polycarboxylic-based or the like. In the present invention, it is preferable that the fluidizing agent is contained in the second powder component in the range of 0.3-1.1 parts by weight. If the content is less than 0.3 parts by weight, the effect of lowering the viscosity can not be exhibited. If the content is more than 1.1 parts by weight Problems such as material separation and bleeding may occur.

In the present invention, the curing accelerator contained in the second powder component of the powder component may be an inorganic curing accelerator such as a chloride, an alkali carbonate or an alkali aluminate such as CaCl ₂ , Na ₂ CO ₃ , Al (OH) ₃ or NaAlO ₂ And the curing accelerator is preferably included in the second powder component in the range of 0.1 to 0.5 parts by weight.

In the present invention, the retarder contained in the second powder component of the powder component has a function of suppressing the formation of cement hydrate and freely adjusts the curing time, and it is possible to use tartaric acid, gluconic acid, citric acid, . In the present invention, it is preferable that the retarder is contained in the range of 0.1 to 0.4 parts by weight in the second powder component.

The silica powder included in the second powder component of the powder component of the present invention is preferably included in the range of 42 to 64 parts by weight in consideration of the specific gravity of the composition.

In the present invention, the first powder component and the second powder component obtained by the above composition are mixed in the range of 10 to 70% by weight and 30 to 90% by weight, respectively, to form a powder component.

In the present invention, the modified latex component (2) is prepared by modifying a powdery or liquid latex rubber resin. The latex rubber resin preferably used in the present invention is one selected from ethylene-vinyl acetate (EVA) resin, NR (natural rubber) resin, NBR (natural rubber-butadiene rubber) resin and SBR It is preferable to use a powdery or liquid polymer resin composed of two or more kinds of resin mixtures. In the present invention, the latex-based rubber resin exhibits an increase in fluidity, an increase in working time (working time) and an improvement in workability in a state before curing of mortar, and an increase in surface adhesion force, an increase in cohesive force, an increase in bending strength, And the like. In addition, the latex rubber resin prevents penetration of chlorides and moisture to prevent concrete from being corroded. In the present invention, it is preferable that the latex rubber resin is used by mixing a certain amount of ultra fast cement, carbon black and fibers in the powdery liquid rubber resin. In the present invention, the quick-speed cement can be used with an ultra-fast vulcanized cement such as Awun, and it strengthens the compressive strength when it is mixed with the latex rubber resin.

Also, in the present invention, the carbon black serves to improve the long-term compressive strength when it is mixed with the latex rubber resin.

In addition, when the fibers are mixed with a latex-based rubber resin, they improve bending strength and tensile strength. In the present invention, the fibers may be natural fibers such as cellulose, or synthetic fibers such as nylon and polyester.

In the present invention, the mixing ratio of the powder or the liquid rubber resin constituting the modified latex component to the ultra fast cement, the carbon black and the fiber is preferably 100: 1 to 20: 0.1 to 10: 0.1 to 10 by weight.

In the present invention, the modified latex component (2) is preferably used in an amount of 1 to 20 parts by weight based on 100 parts by weight of the powder component (1). If the modified latex component (2) is used in an amount of less than 1 part by weight, it is difficult to expect an increase in performance. If the modified latex component is used in an amount exceeding 20 parts by weight, the production of etyne zite may be inhibited.

In the present invention, the liquid component (3) comprises 1 to 7 parts by weight of methyl methacrylate, 5 to 20 parts by weight of styrene monomer, 1 to 10 parts by weight of n-butyl acrylate, 0.1 to 10 parts by weight of methyl acrylate, 0.05 to 5 parts by weight of an initiator, and 0.05 to 5 parts by weight of an emulsifier.

In the present invention, the monomer component constituting the liquid component comprises methyl methacrylate, styrene monomer, n-butyl acrylate, methyl acrylate and isobornyl acrylate, wherein the initiator and the emulsifier are mixed.

Specifically, the methyl methacrylate (MMA) serves to improve the viscosity and adhesion of the repair agent according to the present invention. The methyl methacrylate is preferably included in the first liquid component in the range of 1 to 7 parts by weight. When the methyl methacrylate is contained in an amount of less than 1 part by weight, the viscosity of the repair agent is lowered, When the amount of the acrylic emulsion resin is more than 7 parts by weight, the acrylic emulsion resin can not be easily mixed with the long fibers and the binder due to the excessive viscosity. Thus, there is a problem that the dispersibility of the acrylic emulsion resin is deteriorated, There arises a problem that the workability is lowered.

The styrene monomer is polymerized in the form of a polymer by an initiator to promote hardening of the filler according to the present invention and increase the strength. When the styrene monomer is contained in an amount of less than 5 parts by weight, the hardening speed of the repairing agent is lowered and the strength of the hardened repairing agent is lowered If it exceeds 20 parts by weight, it is included more than necessary, which is not economical.

The n-butyl acrylate serves to improve the adhesion of the repair agent according to the present invention. When the amount of the n-butyl acrylate is less than 1 part by weight, the adhesion of the repairing agent decreases, and when 10 parts by weight of the n-butyl acrylate is added to the first liquid component, If it exceeds, economical efficiency decreases.

The methyl acrylate serves to improve the adhesion performance and strength of the filler according to the present invention. When the methyl acrylate is contained in an amount of less than 0.1 part by weight, the adhesion performance and the strength characteristics are lowered, and when 10 parts by weight of the methyl acrylate is contained in the first liquid component, If it exceeds, economical efficiency decreases.

The isobornyl acrylate serves to improve the dispersibility of components contained in the filler according to the present invention. The isobonyl acrylate is preferably contained in the range of 0.1 to 10 parts by weight based on the first liquid component. When the amount of the isobornyl acrylate is less than 0.1 part by weight, the dispersibility of various components decreases, There is a problem that it is difficult to obtain uniform physical properties. When the amount is more than 10 parts by weight, the addition amount of other components is limited, which makes it difficult to obtain excellent strength and adhesion performance of the repairing agent.

In the present invention, an initiator and an emulsifier are included in addition to the monomer component constituted as described above.

In the present invention, the initiator serves to initiate the polymerization reaction of the monomer component. Examples of the initiator include t-butyl peroxybenzoate, benzoyl peroxide, methyl ethyl ketone peroxide, cumene hydroperoxide, t-butyl Asecape, or 2,5-dimethylhexyl-2,5-diperoxybenzoate, and the like can be used. In the present invention, it is preferable that the initiator is used in the range of 0.05 to 5.0 parts by weight based on the liquid component. When the content of the initiator is less than 0.05 part by weight, the polymerization initiating reaction of the monomer is lowered, There is a problem that it is difficult to control the polymerization reaction efficiently if it exceeds 5.0 parts by weight.

In the present invention, when the water is added to the water-retaining agent according to the present invention, the emulsifier easily mixes the water-retaining agent with water. As the emulsifier in the present invention, a glycerin fatty acid ester, a sorbitan fatty acid ester, or a polyglycerin fatty acid ester may be used. In the present invention, it is preferable that the emulsifier is used in the range of 0.05 to 5.0 parts by weight based on the liquid component. When the content of the emulsifier is less than 0.05 part by weight, If it exceeds 5 parts by weight, there is a problem that the strength and adhesion performance of the repairing agent are difficult to be exerted.

In the present invention, the hydrophilic polyvinyl alcohol short fiber component of (4) has a very high resistance to carbon-containing solvent, oil, salt and alkali, and has excellent resistance even when exposed to direct sunlight. In addition, the hydrophilic structure having hydroxyl group on the fiber surface is well dispersed in the liquid phase, has high elastic modulus and excellent adhesion to powder components, has a relatively small diameter to suppress and stabilize microcracks, It is very effective in increasing mechanical properties and is effective in suppressing cracks caused by fatigue and impact load.

The hydrophilic polyvinyl alcohol short fibers used in the present invention preferably have a specific gravity of 1.1 to 1.3 g / cm 3, a diameter of 9 to 12 탆, a tensile strength of 7000 to 9000 kgf / cm 2 and a length of 3 to 8 mm, It is preferably used in a range of about 1 to 10 parts by weight based on 100 parts by weight of the component. If the content of the hydrophilic polyvinyl alcohol short fiber is less than 1 part by weight, it is not effective to suppress plastic cracking, and if it exceeds 10 parts by weight, entanglement of fibers may occur.

In the present invention, as the additive component (5), it is preferable to mix a mixture of an antiseptic, antifoaming agent and wetting agent in an appropriate ratio.

In the present invention, the preservative is used to prevent fungi or bacteria from living. The antifoaming agent is used to suppress the generation of bubbles during the mixing process of the liquid component and the powder component and the mortar production process. Specifically, Defoamer can be used. In addition, the wetting agent may be a low viscosity wetting agent as a surfactant for uniform mixing of the liquid component and the powder component.

In the present invention, the specific mixing ratio of the additive component is not particularly limited. For example, a preservative, a defoaming agent, and a wetting agent may be mixed in a weight ratio of 1: 10: 1 to 10: 1 to 10.

In the present invention, the additive component (5) is preferably used in an amount of about 1 to 5 parts by weight based on 100 parts by weight of the powder component.

In the present invention, the water of (6) is preferably pure water not mixed with impurities unnecessary for the cement hydration reaction, and it is preferably used in a range of 10 to 50 parts by weight based on 100 parts by weight of the powder component .

The terephthalmic packing repairing agent obtained by the above composition exists in a state in which the liquid component and the powder component are separated from each other and is mixed with the filler and the aggregate immediately before use to constitute a mortar composition, that is, a mortar composition for repairing the tare.

Specifically, the masonry composition for repairing the toughening pavement according to the present invention comprises 5 to 50 parts by weight of the above-mentioned cross-linked packing repairing agent obtained by the composition of the present invention, 10 to 40 parts by weight of the filler and 20 to 70 parts by weight of the aggregate .

In the present invention, the filler may be at least one selected from limestone, abrasive, and talc. The content thereof is preferably in the range of 10 to 40 parts by weight. If the amount is less than 10 parts by weight, the effect of inhibiting the shrinkage of the mortar-cured body may be insignificant and the amount of drying shrinkage may increase. If the amount is more than 40 parts by weight, the amount of filler may be excessive and the fluidity and workability may be deteriorated.

The aggregate is preferably silica sand, and silica sand having a particle size of 0.2 to 2.5 mm is suitable for producing a mortar having good adhesion without being separated from water. It is preferable that the aggregate has a ratio of 20 to 70 parts by weight with respect to the whole mortar composition in consideration of workability to mortar.

The mortar composition may further comprise at least one additive selected from 0.1 to 10 parts by weight of a dispersant, 0.01 to 3 parts by weight of an antifoamer and 0.01 to 10 parts by weight of a retarder, if necessary.

Next, a description will be given of a method for repairing and installing the pavement pavement using the mortar composition for repairing the pavement packing according to the present invention.

First, the broken part of the pavement package is crushed. At this time, it is preferable to partially crush the upper portion of the reinforcement so as not to damage the inner reinforcement. At this time, if the disposing position of the axes is displayed on the upper surface of the cross-section pavement and the shredding operation is performed while avoiding the marked points, it can be efficiently performed.

When the upper part of the root is crushed, it is sprayed with high pressure by using a water jet or the like to cut the crushed part. It is preferable that the high-pressure spraying cutting operation is performed on the entire packaging surface using a high-pressure spraying vehicle provided with a spray nozzle for spraying high-pressure water.

Then clean the cut surface and remove any foreign material. It is preferable that the cleaning and the removal of the foreign matter are performed while moving in the longitudinal direction of the bridge by using the vacuum suction vehicle. At this time, a separate surface drying operation may be performed at the same time.

Next, the prepared masonry composition for repairing the pavement packing is poured onto the cut surface removed in the foreign substance.

In this case, the method may further include a step of applying the primer in a range of 100 to 300 g / m < ² > before placing the mortar composition for repairing the tent pavement on the cut surface from which the foreign matter has been removed. The primer can be a commonly used primer and is not particularly limited.

Then, when the poured concrete repair mortar composition is cured, the surface is finished.

Although not required in the present invention, the repair work may be completed by applying the coating agent after the cement composition repair mortar composition is applied and cured.

In the present invention, as the coating agent, it is preferable to use an aqueous coating agent composed of a main component and a curing agent component.

More specifically, in the present invention, the coating agent may contain 10 to 50 wt% of an epoxy resin, 5 to 40 wt% of a polymethyl methacrylate resin, 1 to 25 wt% of a diluent, 0.1 to 15 wt% of a flocculant, 1 to 20 wt% of an inorganic filler 1 to 20% by weight of a water-soluble oil, 1 to 10% by weight of an emulsifier, 1 to 10% by weight of an emulsifier, 0.1 to 5% by weight of an accelerator, 0.05 to 20% by weight of an emulsifier and 10 to 80% 5 to 20% by weight of water and 50 to 90% by weight of water are mixed to prepare an aqueous solution. 5 to 50 parts by weight of a polyamide and 0.1 to 40 parts by weight of an amine compound are mixed with 100 parts by weight of the obtained aqueous solution to obtain a curing agent component By weight to 50 parts by weight of an epoxy coating agent.

At this time, the epoxy resin used in the present invention may be a commonly used epoxy resin, and general epoxy resin, chlorine-containing epoxy resin, novolac epoxy resin, brominated epoxy resin or a mixture thereof may be used.

In addition, the polymethylmethacrylate (PMMA) resin in the present invention enhances the weather resistance of the epoxy resin composition and smoothly accelerates curing and drying. In the present invention, the polymethyl methacrylate resin preferably has a weight average molecular weight in the range of 10,000 to 300,000.

In the present invention, n-butyl glycidyl ether may be used as the reactive diluent.

In the present invention, the coagulant may be silicon dioxide, aerosil, bentonite nanoparticles, silica nanoparticles or the like.

In the present invention, the inorganic filler may be at least one selected from the group consisting of powders of calcium carbonate, talc, heavy carbon, ceramics, clay, silica and dolomite.

In the present invention, the promoter may be phenol.

In the present invention, the emulsifier may be a copolymer of polyoxyethylene and polyoxypropylene.

The polyamide preferably has a weight average molecular weight of 1,000 to 5,000, more preferably 1,000 to 4,000.

In the present invention, the amine compound may be polyoxypropylene diamine.

In the present invention, the water-soluble oil used for preparing the aqueous hardener component may be a silicone oil or an acetate oil.

In the present invention, the host component is cured by the curing agent component to increase cross-linking, and has a good curing property by bringing about the activation of the gravitational force by the gradual rate control in the curing reaction. Also, in the curing process, the epoxy resin is formed in close contact with the inner side by the action of the coagulating agent and is not exposed to the surface, and the inorganic component is agglomerated to the surface to form a matte inorganic layer. . Accordingly, peeling and cracking of the inorganic layer can be prevented, moisture resistance and weather resistance are improved, surface deterioration is prevented, and durability is improved.

The present invention relates to a mortar composition for repairing pavement packing, which suppresses permeation of deteriorating substances such as salts and acidic substances, thereby improving the durability of concrete structures and excellent compatibility with cement.

The present invention also provides a mortar composition for repairing toughening pavement, which is excellent in adhesion to existing base materials, has no neutralization reaction with concrete, has a water resistance, ozone resistance, chemical resistance, water resistance, air permeability, There is an advantage of not occurring.

In addition, the present invention provides a mortar composition for repairing pavement packing according to the present invention which has excellent air permeability, does not cause condensation, does not oxidize the surface of the structure, has excellent permeability, hardens the infiltrated product, It is excellent in waterproof property, particularly, it prevents cracking of the matrix in which shrinkage and expansion are repeated due to temperature change, and is excellent in stretchability and is very suitable for work in a vibration area.

In addition, the mortar composition for repairing the pavement packing according to the present invention is excellent in strength to obtain a good structure, inhibits the penetration of carbon dioxide, and prevents water infiltration. The present invention relates to a mortar composition for repairing pavement packing, which is low in the content of volatile organic compounds (VOC), is environmentally friendly, has no air pollution, exhibits high strength, has excellent early strength, Is excellent and suppresses the generation of cracks. The mortar composition for repairing the pavement packing according to the present invention is excellent in water resistance, weather resistance, chemical resistance and stain resistance, and can protect the matrix and the finish surface from chemical gas, exhaust gas and rainwater, And there is no environmental pollution because organic solvents (thinner, etc.) are not used for construction and equipment cleaning.

In addition, the mortar composition for repairing pavement packing according to the present invention is excellent in compatibility between a liquid component and a powder component, and is easily compounded and easy to apply, and is excellent in workability. The present invention provides a mortar composition for repairing torsion pavement, which is excellent in high elasticity, smoothness, low-temperature stability (cracking resistance) and odorlessness, exhibits good dispersing action with a small mixing ratio with water, and maintains uniform strength and high strength at the same time. In addition, due to the good dispersing action of the binder, a high-density dense textured body is formed, which is excellent in chemical resistance (salt resistance and acid resistance) and inhibits penetration of water, oil and the like.

In addition, since the mortar composition for repairing pavement packing according to the present invention is an inorganic material such as concrete, it is excellent in adhesion force due to the affinity of similar materials and excellent in short-term adhesion strength and long-term stability. And low rebound rate. In addition, when the mortar composition for repairing the treadmill according to the present invention is used, there is an advantage that cracks are not generated due to proper balance of strength and stability.

Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited by the following examples.

[Example]

Example  One

70 weight parts of Portland cement, 5 weight parts of clinker, 5 weight parts of gypsum, 5 weight parts of plaster, 5 weight parts of alpha type hemihydrate gypsum, 3 weight parts of silica fume, 3 weight parts of fly ash, 7 weight parts of limestone, , 7 parts by weight of calcined pozzolan and 3 parts by weight of microsilica were mixed to prepare a first powder component,

5 parts by weight of a siliceous waterproofing agent, 10 parts by weight of a CSA-based swelling agent, 0.1 part by weight of a viscosity enhancer, 1.0 part by weight of a fluidizing agent, 0.2 part by weight of a curing accelerator, 0.2 parts by weight of a retarder, After that,

The obtained first powder component and second powder component were mixed at a weight ratio of 50:50 to obtain a powder component.

Subsequently, the modified latex component was obtained by mixing the ultra-fast cement, carbon black and fibers with the SBR powder resin, and 10 parts by weight of the modified powder component was prepared based on 100 parts by weight of the powder component.

Subsequently, 5 parts by weight of methyl methacrylate, 10 parts by weight of styrene monomer, 5 parts by weight of n-butyl acrylate, 5 parts by weight of methyl acrylate and 5 parts by weight of isobornyl acrylate were mixed, and 3 parts by weight of t-butyl peroxybenzoate And 4 parts by weight of glycerin fatty acid ester were mixed to obtain a liquid component, and 10 parts by weight of the powder component was prepared based on 100 parts by weight of the powder component.

Next, hydrophilic polyvinyl alcohol short fibers were prepared in an amount of 5 parts by weight based on 100 parts by weight of the powder component.

Then, 3 parts by weight of an additive component composed of a mixture of preservative, antifoaming agent and humectant was prepared.

The obtained materials were mixed with 40 parts by weight of water before use to obtain a repairing composition. To 40 parts by weight of the above-prepared filler composition were added 30 parts by weight of filler comprising talc and talc and 60 parts by weight of silica sand to prepare a repair mortar composition .

Comparative Example  1 (Experiment using the composition of Korean Patent No. 10-1528120)

7 parts by weight of methyl methacrylate, 8 parts by weight of styrene monomer, 10 parts by weight of n-butyl acrylate, 10 parts by weight of methyl acrylate and 5 parts by weight of isobornyl acrylate were mixed to prepare a first liquid component, 3 parts by weight of oxybenzoate and 3 parts by weight of glycerin fatty acid ester were mixed to prepare a second liquid component. Then, 5 parts by weight of clinker, 5 parts by weight of gypsum, 5 parts by weight of plaster, 5 parts by weight of anhydrous gypsum and 3 parts by weight of silica fume , 3 parts by weight of fly ash, 7 parts by weight of limestone, 3 parts by weight of slag, 7 parts by weight of calcined pozzolanas and 3 parts by weight of microsilica were mixed to prepare a first powder component. 20 parts by weight of oyster shell powder, 10 parts by weight of purified water sludge powder 10 , 20 parts by weight of waste glass powder, and 40 parts by weight of waste stone powder were mixed to prepare a second powder component.

Then, the first liquid component and the second liquid component were mixed at a weight ratio of 90:10 to prepare a liquid component. Then, based on 100 parts by weight of the liquid component, 5 parts by weight of the first powder component, 8 parts by weight of a powder component and 3 parts by weight of a cellulose long fiber were mixed to prepare a repairing composition.

Forty parts by weight of the above-prepared repair filler composition was mixed with 40 parts by weight of filler comprising talc and talc and 70 parts by weight of silica sand to prepare a mortar composition.

Comparative Example  2

5 parts by weight of clinker, 5 parts by weight of gypsum, 5 parts by weight of plaster, 5 parts by weight of anhydrous gypsum, 3 parts by weight of silica fume, and 3 parts by weight of fly ash 3 7 parts by weight of limestone, 3 parts by weight of slag, 7 parts by weight of calcined pozzolan, 3 parts by weight of microsilica and 2 parts by weight of cellulose long fiber were mixed to prepare a repair composition.

30 parts by weight of a filler comprising stoneware and talc and 60 parts by weight of silica sand were mixed with 40 parts by weight of the above-prepared filler composition to prepare a mortar composition.

Comparative Example  3

5 parts by weight of styrene monomer, 5 parts by weight of t-butyl peroxybenzoate and 5 parts by weight of glycerin fatty acid ester were mixed, and 5 parts by weight of clinker, 5 parts by weight of gypsum, 5 parts by weight of plaster, 5 parts by weight of anhydrous gypsum, 3 parts by weight of fume, 3 parts by weight of fly ash, 7 parts by weight of limestone, 3 parts by weight of slag, 7 parts by weight of calcined pozzolanas, 3 parts by weight of microsilica and 2 parts by weight of cellulose long fibers.

30 parts by weight of a filler comprising stoneware and talc and 60 parts by weight of silica sand were mixed with 40 parts by weight of the above-prepared filler composition to prepare a mortar composition.

Comparative Example  4

30 parts by weight of n-butyl acrylate and 5 parts by weight of glycerin fatty acid ester were mixed, and 5 parts by weight of clinker, 5 parts by weight of gypsum, 5 parts by weight of plaster, 5 parts by weight of anhydrous gypsum, 3 parts by weight of silica fume, 7 parts by weight of limestone, 3 parts by weight of slag, 7 parts by weight of calcined pozzolan, 3 parts by weight of microsilica and 2 parts by weight of cellulose long fiber were mixed to prepare a repair composition.

30 parts by weight of a filler comprising stoneware and talc and 60 parts by weight of silica sand were mixed with 40 parts by weight of the above-prepared filler composition to prepare a mortar composition.

Comparative Example  5

30 parts by weight of isobornyl acrylate and 5 parts by weight of glycerin fatty acid ester were mixed. Then, 5 parts by weight of clinker, 5 parts by weight of gypsum, 5 parts by weight of plaster, 5 parts by weight of anhydrous gypsum, 3 parts by weight of silica fume, 7 parts by weight of limestone, 3 parts by weight of slag, 7 parts by weight of calcined pozzolan, 3 parts by weight of microsilica and 2 parts by weight of cellulose long fiber were mixed to prepare a repair composition.

20 parts by weight of a filler comprising stoneware and talc and 70 parts by weight of silica sand were mixed with 40 parts by weight of the above-prepared filler composition to prepare a mortar composition.

Comparative Example  6

5 parts by weight of methyl methacrylate, 10 parts by weight of styrene monomer, 5 parts by weight of n-butyl acrylate, 5 parts by weight of methyl acrylate, 5 parts by weight of isobornyl acrylate, 0.1 part by weight of t-butyl peroxybenzoate, And 5 parts by weight of gypsum, 5 parts by weight of plaster, 5 parts by weight of anhydrous gypsum, 3 parts by weight of silica fume, 3 parts by weight of fly ash, 7 parts by weight of limestone, 7 parts by weight of calcined pozzolanas, 3 parts by weight of microsilica and 2 parts by weight of cellulose long fibers were mixed to prepare a repair agent composition.

20 parts by weight of a filler comprising stoneware and talc and 70 parts by weight of silica sand were mixed with 40 parts by weight of the above-prepared filler composition to prepare a mortar composition.

Comparative Example  7

5 parts by weight of methyl methacrylate, 10 parts by weight of styrene monomer, 5 parts by weight of n-butyl acrylate, 5 parts by weight of methyl acrylate, 5 parts by weight of isobornyl acrylate, 0.1 part by weight of t-butyl peroxybenzoate, And 0.1 part by weight of ester were mixed, and 46 parts by weight of limestone was further mixed therewith to prepare a repairing composition.

30 parts by weight of a filler comprising stoneware and talc and 60 parts by weight of silica sand were mixed with 40 parts by weight of the above-prepared filler composition to prepare a mortar composition.

<Performance evaluation>

1. Evaluation of compressive strength with time

The compressive strength of the repair mortar composition prepared according to Example 1 and Comparative Examples 1 to 7 with time was evaluated according to the method of KS F 2405, and the results are shown in Table 1.

Sample 1 hour (Mpa) 3 hours (Mpa) 6 hours (Mpa) 24 hours (Mpa) 7 days (Mpa) Example 1 16.2 25.1 35.9 40.8 42.0 Comparative Example 1 8.5 16.9 19.1 25.5 28.1 Comparative Example 2 9.2 18.5 19.9 25.1 27.8 Comparative Example 3 10.1 19.0 22.1 26.9 28.9 Comparative Example 4 9.5 18.2 23.0 25.2 28.0 Comparative Example 5 8.2 17.0 20.1 25.9 27.8 Comparative Example 6 9.7 19.2 22.0 23.8 25.1 Comparative Example 7 10.8 21.0 23.9 27.0 29.9

As can be seen from the results of Table 1, the initial strength characteristics of Example 1, which is a repair mortar composition according to the present invention, are much higher than those of Comparative Examples 1 to 7 which are conventional mortar compositions. As a result, it is possible to minimize the work time, which can shorten the repair work time of the pavement pavement, so that the traffic control is expected to be minimized.

2. Evaluation of bending strength according to time

The bending strengths of the repair mortar compositions prepared according to Example 1 and Comparative Examples 1 to 7 with time were evaluated according to the method of KS F 2408 and the results are shown in Table 2.

Sample 1 hour (Mpa) 3 hours (Mpa) 6 hours (Mpa) 24 hours (Mpa) 7 days (Mpa) Example 1 3.9 5.9 6.8 8.0 9.5 Comparative Example 1 2.5 4.5 5.0 6.4 7.2 Comparative Example 2 2.6 4.7 5.3 6.1 6.9 Comparative Example 3 2.9 4.5 5.1 6.2 7.0 Comparative Example 4 3.0 4.1 4.9 5.8 6.8 Comparative Example 5 2.5 4.2 4.9 5.5 6.5 Comparative Example 6 2.6 4.6 5.3 6.3 7.0 Comparative Example 7 2.9 5.0 5.9 6.5 7.5

As shown in the results of Table 2, the repair mortar composition according to Example 1 of the present invention exhibits a higher bending strength characteristic than the conventional mortar compositions Comparative Examples 1 to 7. As a result, the bonding strength with the existing pavement is excellent and it is suitable to be used for emergency repair of the pavement pavement.

3. Bending strength, compressive strength, tensile strength, bond strength and volume change rate test

The flexural strength, compressive strength, tensile strength, volume change rate and adhesion strength of the repair mortar composition prepared in Example 1 and Comparative Examples 1 to 7 were measured.

The bending strength, compressive strength, tensile strength and adhesion strength were measured according to the standard of KS F 4042-02 after 28 days of the application of the concrete repair agent. The volume change rate was calculated by dividing the volume of the repair mortar composition after 28 days from 0 ° C to 35 ° C Lt; 0 &gt; C, and the results are shown in Table 3 below.

Sample Flexural strength
(N / mm &lt; 2 & Compressive strength
(N / mm &lt; 2 & The tensile strength
(N / mm &lt; 2 & Bond strength
(MPa) Volume change rate
(%) Example 1 25.0 72.8 12.0 3.5 0.0001 Comparative Example 1 17.2 50.0 5.0 2.0 0.0005 Comparative Example 2 15.5 35.5 3.5 0.5 0.0009 Comparative Example 3 10.6 40.0 4.0 1.2 0.0012 Comparative Example 4 8.5 30.5 3.8 1.0 0.0008 Comparative Example 5 11.2 35.0 2.9 0.8 0.0009 Comparative Example 6 8.9 35.5 4.4 0.9 0.0010 Comparative Example 7 10.8 38.0 4.2 1.1 0.0015

Referring to Table 3, the repair mortar composition according to the present invention shows excellent strength and adhesion performance as compared with conventional materials.

4. Waterproof and chemical resistance test

Water resistance and chemical resistance of the repair mortar composition prepared according to Example 1 and Comparative Examples 1 to 7 were measured.

The waterproof property was evaluated by observing the permeability of the water for 6 months on a monthly basis by applying the repair mortar composition on the concrete structure to a thickness of 1 cm and installing a cylindrical water tank on the mortar composition layer.

The chemical resistance was evaluated by treating the mortar composition layer having a salt concentration of 35 ‰ and the sulfuric acid solution having a concentration of 2% on the mortar composition layer after 28 days of curing on the concrete structure for 1 hour each day, And was confirmed for 60 days.

The results are shown in Table 4 below.

Sample Water resistance test
(month) Chemical resistance test (days) Brine Sulfuric acid solution Example 1 - - 45 Comparative Example 1 One 5 15 Comparative Example 2 One 20 5 Comparative Example 3 2 35 10 Comparative Example 4 One 40 15 Comparative Example 5 2 26 8 Comparative Example 6 One 39 12 Comparative Example 7 One 27 9

As shown in Table 4, in the case of Example 1, moisture was not penetrated at all for 6 months, whereas in Comparative Examples 1 to 7, it was confirmed that moisture penetrated after 1 to 2 months. This is interpreted as a result of exhibiting excellent waterproof performance of the repair mortar composition according to the present invention.

In Table 4, it can be seen that no surface damage was caused by the brine treated for 60 days in Example 1, and no surface damage was observed for 45 to 52 days when the sulfuric acid solution was treated. On the other hand, in the case of Comparative Examples 1 to 7, the surface damage occurred 20 to 40 days after the saline treatment, and when the sulfuric acid solution was treated, the surface damage occurred within 5 to 15 days.

This is interpreted as a result of supporting the excellent chemical resistance of the mortar composition for repair and reinforcement according to the present invention.

5. Freeze-thaw resistance, crack resistance and dry shrink resistance

Freezing and thawing resistance, cracking resistance, and drying shrinkage resistance of the repair mortar composition prepared according to Example 1 and Comparative Examples 1 to 7 were measured.

The freeze-thaw resistance was tested by the freeze-thaw resistance test according to KS F 2456.

Crack resistance was tested according to AASHTO PP34-98.

Dry shrinkage resistance was tested according to KS F 2424.

The results are shown in Table 5.

Sample Freeze-thaw resistance (%) Crack resistance Dry shrinkage resistance Reference value: 80% or more Reference value: No crack up to 56 days Reference value: 0.15 or less Example 1 95 No crack 0.01 Comparative Example 1 88 No crack 0.02 Comparative Example 2 87 No crack 0.03 Comparative Example 3 82 No crack 0.03 Comparative Example 4 82 No crack 0.05 Comparative Example 5 80 No crack 0.05 Comparative Example 6 80 No crack 0.04 Comparative Example 7 80 No crack 0.04

As shown in Table 5, it can be seen that the repair mortar composition of Example 1 according to the present invention is superior in terms of freeze-thaw resistance, crack resistance, and shrinkage resistance than conventional materials.

Claims (5)

(a) preparing a masonry composition for repairing a masonry packing, wherein the masonry composition for repairing the masonry packing comprises
(1) 50 to 100 parts by weight of cement, 0.5 to 10 parts by weight of clinker, 0.5 to 10 parts by weight of plaster, 0.5 to 10 parts by weight of alpha type hemihydrate, 0.1 to 5 parts by weight of silica fume, 0.01 to 5 parts by weight of fly ash, 10 to 70% by weight of a first powder component comprising 0.5 to 10 parts by weight of limestone, 1 to 20 parts by weight of blast furnace slag, 0.01 to 10 parts by weight of calcined pozzolan and 0.01 to 10 parts by weight of microsilica; 0.05 to 0.2 parts by weight of a viscosity enhancer, 0.3 to 1.1 parts by weight of a fluidizing agent, 0.1 to 0.5 parts by weight of a curing accelerator, 0.1 to 0.4 parts by weight of a retarding agent, 2 to 7 parts by weight of a siliceous waterproofing agent, 5 to 15 parts by weight of a CSA- And 42 to 64 parts by weight of silica sand and 30 to 90% by weight of a second powder component comprising 100 parts by weight of the powder component.
(2) One or more powder or liquid rubber selected from ethylene-vinyl acetate (EVA) resin, NR (natural rubber) resin, NBR (natural rubber-butadiene rubber) resin and SBR 1 to 20 parts by weight of a modified latex component obtained by mixing a resin with cement-like quick-setting cement, carbon black and fibers;
(3) 1 to 7 parts by weight of methyl methacrylate, 5 to 20 parts by weight of styrene monomer, 1 to 10 parts by weight of n-butyl acrylate, 0.1 to 10 parts by weight of methyl acrylate, 0.1 to 10 parts by weight of isobornyl acrylate, 0.05 to 5 parts by weight of an initiator and 0.05 to 5 parts by weight of an emulsifier;
(4) 1 to 10 parts by weight of a hydrophilic polyvinyl alcohol short fiber component;
(5) 1 to 5 parts by weight of an additive component comprising a mixture of a preservative, an antifoaming agent and a humectant; And
(6) 10 to 50 parts by weight of water, 5 to 50 parts by weight of the filler and 10 to 40 parts by weight of the filler and 20 to 70 parts by weight of the aggregate, Preparing a masonry composition for maintenance of a pavement packing;
(b) crushing the damaged part of the bridge pavement, but only the upper part of the reinforcement is partially broken so that the inner reinforcement is not damaged, and the installation position of the reinforcement is marked on the upper face of the bridge pavement, And crushing the broken portion of the cross-linked package by cutting the crushed portion by high-pressure spraying using a water jet apparatus when the upper portion of the root is crushed;
(c) The shredded portion is cut by high-pressure spraying to remove foreign matter present on the cutting surface, while moving in the longitudinal direction of the bridge using a vacuum suction vehicle, performing cleaning and foreign matter removal, and simultaneously performing a surface drying operation ;
(d) placing a mortar composition for repairing a pavement packing prepared in the step (a) on the cut surface from which the foreign matter is removed; And
(e) curing and pouring the surface of the poured masonry repair mortar composition,
The mixture of 100 parts by weight of the natural pozzolana of the above (1) and 1 to 20 parts by weight of calcium is calcined at 1000 to 1200 ° C. for 0.5 to 1 hour and then pulverized to have an average particle size of 10 to 20 μm .
The method of claim 1, further comprising coating the coating agent after curing the cemented packaging repair mortar composition, wherein the coating agent comprises 10 to 50 wt% of an epoxy resin, 5 to 40 wt% of a polymethyl methacrylate resin, 1 to 25 wt% Based on 100 parts by weight of the host material obtained by mixing 0.1 to 15% by weight of a flocculant, 1 to 20% by weight of an inorganic filler, 0.1 to 5% by weight of an accelerator, 0.05 to 20% by weight of an emulsifier and 10 to 80% And 5 to 20 parts by weight of an emulsifier, 5 to 20 parts by weight of an accelerator, and 50 to 90 parts by weight of water are mixed to prepare an aqueous solution, and 5 to 50 parts by weight of a polyamide, And 0.1 to 40 parts by weight of a compound is mixed with a curing agent component in an amount of 5 to 50 parts by weight.
delete The method according to claim 1, wherein the step (d) comprises applying the primer in a range of 100 to 300 g / m ² before placing the mortar composition for repairing the pavement packaged in (a) on the cut surface from which the foreign matter has been removed Wherein the pavement repairing method further comprises:
The method according to claim 3, wherein the fluidizing agent contained in the second powder component of the powder component is a naphthalene-based, melamine-based or polycarboxylic-based fluidizing agent.
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