CN111879637A - Method for evaluating rutting resistance of asphalt mixture for urban intersections - Google Patents
Method for evaluating rutting resistance of asphalt mixture for urban intersections Download PDFInfo
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- CN111879637A CN111879637A CN202010766464.9A CN202010766464A CN111879637A CN 111879637 A CN111879637 A CN 111879637A CN 202010766464 A CN202010766464 A CN 202010766464A CN 111879637 A CN111879637 A CN 111879637A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2873—Cutting or cleaving
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0256—Triaxial, i.e. the forces being applied along three normal axes of the specimen
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0266—Cylindrical specimens
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0298—Manufacturing or preparing specimens
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0688—Time or frequency
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Abstract
The invention discloses an evaluation method of the rutting resistance of an asphalt mixture, which simulates the complex stress condition of the road surface of an urban road intersection through a triaxial shear test. The method for comprehensively evaluating the anti-rutting capability of the asphalt mixture by obtaining the dynamic modulus E, the phase angle and the E/sin of the asphalt mixture through the test can overcome the limitation of the traditional method and more accurately reflect the high-temperature anti-rutting capability of the asphalt mixture from the inherent characteristics of the material. The larger the dynamic modulus is, the smaller the phase angle is, and the larger the | E |/sin at 60 ℃, the better the anti-rutting capability of the asphalt mixture is.
Description
Technical Field
The invention belongs to the field of road construction and maintenance, and particularly relates to an urban road intersection with serious track diseases, which can effectively prolong the service life of the road surface and improve the track diseases of the road surface of the intersection.
Background
With the rapid development of economy leading to the great increase of vehicle holding capacity, urban road traffic is increasingly sharply increased and even exceeds the traffic volume of the limit value, which puts higher requirements on the road performance of the urban road. At present, most urban roads are asphalt mixture pavements, and are affected by factors such as heavy load, large-flow traffic, structures and materials, construction quality and environment, so that the urban roads are easy to generate diseases such as cracks, ruts, pits and the like, wherein the rut problem is particularly prominent. And the important traffic junction intersections of the urban roads are sections with multiple track diseases. The intersection undertakes the collection of vehicle and pedestrian, and the vehicle often carries out frequent braking, starts here, leads to the intersection road surface to receive the effect of bigger shear stress, and the road surface is very easily appeared the rut disease. In addition, in order to improve the traffic capacity of the road intersection, the number of lanes is usually increased at the intersection, so that the intersection bears more traffic, and the generation of the ruts on the road surface of the intersection is accelerated. Therefore, the asphalt mixture with high anti-rutting performance is adopted at the urban intersections, so that the problems can be effectively alleviated.
The asphalt mixture has more types and different performances, and the study on the anti-rutting capability of the asphalt mixture under the special working condition of urban intersection pavements by scholars at home and abroad is less. At present, the anti-rutting capability of the asphalt mixture is generally evaluated by adopting dynamic stability, but the evaluation mode has certain limitation, the real anti-rutting condition of the road surface cannot be actually simulated, and the lateral pressure surface of the asphalt mixture is more in line with the actual stress state of the road mixture than a single-axis test.
Disclosure of Invention
The invention aims to overcome the defects of the traditional rut evaluation method and provide a method for evaluating the rut performance of an asphalt mixture on a road surface of an urban intersection, and the method can better simulate the actual stress state of the road surface mixture with a lateral pressure surface.
The technical scheme of the invention is as follows: the method for evaluating the anti-rutting performance of the asphalt mixture for the urban intersections is characterized by comprising the following steps of:
step 1: forming an asphalt mixture test piece by a rotary compaction method;
step 2: drilling a core and cutting an asphalt mixture test piece;
and step 3: carrying out a triaxial shear test by using a UTM-25 testing machine, applying sinusoidal axial compressive stress to a test piece, and obtaining stress applied at corresponding time and generated axial strain;
and 4, step 4: acquiring the dynamic modulus | E | of the asphalt mixture and phase angles under different frequencies according to the measured stress-strain relation;
and 5: obtaining | E |/sin according to the dynamic modulus | E | of the asphalt mixture and phase angles under different frequencies, and evaluating the rutting resistance of the asphalt mixture for urban intersections.
2. The method for evaluating the rutting resistance of the asphalt mixture for the urban intersections according to claim 1, wherein in step 1, the asphalt mixture with the dimensions of phi 150mm x 165mm is prepared by using a rotary compaction apparatus.
3. The method for evaluating the rutting resistance of the asphalt mixture for urban intersections according to claim 1, wherein in step 2, a core drilling machine is used for core drilling and sampling a test piece formed by the rotary compactor, the diameter of the test piece obtained by core drilling is 100mm, the circumference is smooth and parallel, the test piece is cylindrical, and the diameter is measured at six points which are 90 degrees apart along the axial direction in the middle height range of the test piece, so that the standard deviation is not more than 2.5 mm. And after the core is drilled, cutting two end faces of the test piece by using a single-face saw or a double-face saw, wherein the upper end face and the lower end face of the test piece are smooth and parallel and the degree of orthogonality with the axial direction is ensured in the cutting process, and the height is 150 mm.
4. The method for evaluating the rutting resistance of the asphalt mixture for urban intersections according to claim 1, wherein in step 3, the test is performed by using UTM-25, sinusoidal axial compressive stress is applied to the test piece at different frequencies at a specified test temperature, and the applied stress and the generated axial strain at corresponding time are measured.
5. The method for evaluating the rutting resistance of the asphalt mixture for urban intersections according to claim 1, wherein in step 4, the measured stress-strain relationship can be expressed by a complex modulus (E), an absolute value of the complex modulus is defined as a dynamic modulus | E | which is a ratio of a sinusoidal load to a sinusoidal strain, and the calculation formula is as follows:
in the formula: an | E | a dynamic modulus; sigma0-applying the amplitude of the sinusoidal loading;0-amplitude of the resulting sinusoidal strain.
At the same time, phase angles at different frequencies are obtained.
6. The method for evaluating the rutting resistance of the asphalt mixture for the urban intersections according to claim 1, wherein in step 5, the dynamic modulus is larger, the phase angle is smaller, and the larger the value of | E |/sin is, the stronger the high-temperature rutting resistance of the asphalt mixture is.
Advantages and advantageous effects of the invention
1. The invention utilizes a triaxial shear test, and the test result can be used for representing the anti-rutting capability of the asphalt mixture. Meanwhile, the triaxial shear test can change different temperatures and loading frequencies to simulate more complex working conditions, and the result is more detailed and accurate and is closer to the actual condition.
2. The invention is based on understanding of the physical and mechanical properties of the asphalt mixture, and more accurately reflects the high-temperature anti-rutting performance of the asphalt mixture from the aspects of temperature, load, action time, environmental influence and the like and from the aspects of the intrinsic characteristics of the material.
Drawings
FIG. 1 is a core sample picture;
FIG. 2 is a picture after sampling;
FIG. 3 is a standard core sample formed by cutting the two ends of the core.
Detailed Description
The invention is further explained by three asphalt mixtures of the existing AC-20 limestone high-strength asphalt mixture, the AC-20 limestone SBS modified asphalt mixture and the AC-20 limestone common asphalt.
Step 1: and (3) preparing a phi 150mm x 165mm asphalt mixture test piece by adopting a rotary compaction instrument. Each blend was formed into 18 test pieces for a total of 54 test pieces.
Step 2: a core drilling machine is adopted to drill and sample a test piece formed by the rotary compaction instrument, the diameter of the test piece obtained by drilling is ensured to be 100mm, the circumference is smooth and parallel, the test piece is cylindrical, the diameter is measured at six points which are separated by 90 degrees along the axial direction in the middle height range of the test piece, and the standard deviation is ensured not to be larger than 2.5 mm. After core drilling and sampling, cutting two ends of a test piece subjected to core drilling, generally cutting two end faces of the test piece by using a single-face saw or a double-face saw, wherein the upper end face and the lower end face of the test piece are smooth and parallel and the orthogonal degree of the upper end face and the lower end face with the axial direction is ensured in the cutting process, and the height is 150 mm. The co-drilled core was cut to obtain 54 test pieces.
And step 3: selecting 30 ℃, 40 ℃ and 60 ℃ for testing, performing a triaxial shear test by using a UTM-25 servo hydraulic multifunctional material testing machine at the frequencies of 0.1Hz, 0.5Hz, 1Hz, 5Hz, 10Hz and 25Hz, applying sinusoidal axial compressive stress to a test piece, and obtaining stress applied at corresponding time and generated axial strain; a total of 54 trials were conducted.
And 4, step 4: acquiring the dynamic modulus | E | of the asphalt mixture and phase angles under different frequencies according to the measured stress-strain relation; a total of 54 sets of E and 54 sets of phase angle data are acquired.
And 5: the rutting resistance of the asphalt mixture for the urban intersections is evaluated according to the dynamic modulus | E | of the asphalt mixture and phase angles at different frequencies, wherein the data are shown in tables 1, 2 and 3.
TABLE 1 dynamic modulus MPa of different kinds of asphalt mixtures
TABLE 2 phase angles of different bitumen mixtures °
TABLE 3. temperature 60 ℃ under different frequency, | E |/sin value MPa of each asphalt mixture
The anti-rutting capability of the shell high-strength modified asphalt is better than that of other two asphalt mixtures, the dynamic modulus or the | E |/sin value of the shell high-strength modified asphalt is far greater than that of the other two asphalt mixtures, and the shell high-strength modified asphalt has more excellent high-temperature anti-rutting performance.
Claims (6)
1. The method for evaluating the anti-rutting performance of the asphalt mixture for the urban intersections is characterized by comprising the following steps of:
step 1: forming an asphalt mixture test piece by a rotary compaction method;
step 2: drilling a core and cutting an asphalt mixture test piece;
and step 3: carrying out a triaxial shear test by using a UTM-25 testing machine, applying sinusoidal axial compressive stress to a test piece, and obtaining stress applied at corresponding time and generated axial strain;
and 4, step 4: acquiring the dynamic modulus | E | of the asphalt mixture and phase angles under different frequencies according to the measured stress-strain relation;
and 5: obtaining | E |/sin according to the dynamic modulus | E | of the asphalt mixture and phase angles under different frequencies, and evaluating the rutting resistance of the asphalt mixture for urban intersections.
2. The method for evaluating the rutting resistance of the asphalt mixture for urban intersections according to claim 1, wherein in step 1, the asphalt mixture with the dimensions of phi 150mm x 165mm is prepared by using a rotary compactor.
3. The method for evaluating the rutting resistance of the asphalt mixture for urban intersections according to claim 1, wherein in step 2, a core drilling machine is used for core drilling and sampling a test piece formed by the rotary compaction instrument, the diameter of the test piece obtained by core drilling is ensured to be 100mm, the circumference is smooth and parallel, the test piece is cylindrical, the diameter is measured at six points which are 90 degrees apart along the axial direction within the range of the middle height of the test piece, and the standard deviation is ensured not to be more than 2.5 mm; and after the core is drilled, cutting two end faces of the test piece by using a single-face saw or a double-face saw, wherein the upper end face and the lower end face of the test piece are smooth and parallel and the degree of orthogonality with the axial direction is ensured in the cutting process, and the height is 150 mm.
4. The method for evaluating the rutting resistance of the asphalt mixture for urban intersections according to claim 1, wherein in step 3, the test is performed by using UTM-25, sinusoidal axial compressive stress is applied to the test piece at different frequencies at a specified test temperature, and the applied stress and the generated axial strain at corresponding time are measured.
5. The method for evaluating the rutting resistance of the asphalt mixture for urban intersections according to claim 1, wherein in step 4, the measured stress-strain relationship can be expressed by a complex modulus E, an absolute value of the complex modulus E is defined as a dynamic modulus | E | which is a ratio of a sinusoidal load to a sinusoidal strain, and the calculation formula is as follows:
in the formula: an | E | a dynamic modulus; sigma0-applying the amplitude of the sinusoidal loading;0-the amplitude of the resulting sinusoidal strain; at the same time, phase angles at different frequencies are obtained.
6. The method for evaluating the rutting resistance of the asphalt mixture for the urban intersections according to claim 5, wherein in step 5, the dynamic modulus is larger, the phase angle is smaller, and the larger the value of E/sin is, the higher the high-temperature rutting resistance of the asphalt mixture is.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11814506B2 (en) | 2019-07-02 | 2023-11-14 | Marathon Petroleum Company Lp | Modified asphalts with enhanced rheological properties and associated methods |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7374659B1 (en) * | 2004-06-22 | 2008-05-20 | Asphalt Technology, Llc. | Methods and systems for modifying asphalts |
| CN102628780A (en) * | 2012-03-29 | 2012-08-08 | 长沙理工大学 | Asphalt mixture viscoelasticity performance test method based on wheel load instrument |
| US20120253704A1 (en) * | 2011-03-29 | 2012-10-04 | University Of Tennessee Research Foundation | Method and apparatus for fatigue and viscoeleastic property testing of asphalt mixtures using a loaded wheel tester |
| US20130210966A1 (en) * | 2010-02-23 | 2013-08-15 | Majid Jamshed CHUGHTAI | Bituminous composition |
| US20140130712A1 (en) * | 2012-11-14 | 2014-05-15 | Colas | Binder modified with glycerol for making asphalt mixes with a hicontent of recycled bituminous materials |
| CN110044773A (en) * | 2019-04-16 | 2019-07-23 | 长沙理工大学 | A kind of modified pitch high-temperature behavior evaluation method |
| CN110929940A (en) * | 2019-11-26 | 2020-03-27 | 太原理工大学 | Method for predicting dynamic modulus of asphalt mixture and application thereof |
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2020
- 2020-08-03 CN CN202010766464.9A patent/CN111879637A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7374659B1 (en) * | 2004-06-22 | 2008-05-20 | Asphalt Technology, Llc. | Methods and systems for modifying asphalts |
| US20130210966A1 (en) * | 2010-02-23 | 2013-08-15 | Majid Jamshed CHUGHTAI | Bituminous composition |
| US20120253704A1 (en) * | 2011-03-29 | 2012-10-04 | University Of Tennessee Research Foundation | Method and apparatus for fatigue and viscoeleastic property testing of asphalt mixtures using a loaded wheel tester |
| CN102628780A (en) * | 2012-03-29 | 2012-08-08 | 长沙理工大学 | Asphalt mixture viscoelasticity performance test method based on wheel load instrument |
| US20140130712A1 (en) * | 2012-11-14 | 2014-05-15 | Colas | Binder modified with glycerol for making asphalt mixes with a hicontent of recycled bituminous materials |
| CN110044773A (en) * | 2019-04-16 | 2019-07-23 | 长沙理工大学 | A kind of modified pitch high-temperature behavior evaluation method |
| CN110929940A (en) * | 2019-11-26 | 2020-03-27 | 太原理工大学 | Method for predicting dynamic modulus of asphalt mixture and application thereof |
Non-Patent Citations (2)
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| 张启云等: "高强度沥青粘结料抗车辙性能试验及评价指标研究", 《公路》 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11814506B2 (en) | 2019-07-02 | 2023-11-14 | Marathon Petroleum Company Lp | Modified asphalts with enhanced rheological properties and associated methods |
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Application publication date: 20201103 |