CN113376361B - Internal stress test method for driving asphalt cement to recover and heal - Google Patents
Internal stress test method for driving asphalt cement to recover and heal Download PDFInfo
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- CN113376361B CN113376361B CN202110556979.0A CN202110556979A CN113376361B CN 113376361 B CN113376361 B CN 113376361B CN 202110556979 A CN202110556979 A CN 202110556979A CN 113376361 B CN113376361 B CN 113376361B
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/42—Road-making materials
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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
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- 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
- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
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- 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
- G01N2203/0071—Creep
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- G—PHYSICS
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- 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
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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Abstract
The invention discloses an internal stress test method for driving asphalt cement to recover and heal, and belongs to the field of road engineering. The method is implemented by means of a dynamic shear rheometer, and mainly tests the internal stress of the asphalt cement in the recovery stage after the loading stage, and the principle is that the residual strain of the recovery stage is set to be unchanged in the recovery stage after the loading of the asphalt cement. Considering that the residual strain of the asphalt cement is continuously reduced under the drive of the internal stress without any applied force during the unloading stage, when the strain rate is kept at zero and kept unchanged over time, the internal stress balances with the external stress, and the value of the outputted external stress is regarded as the corresponding magnitude of the internal stress. The method is simple and flexible, is convenient to use, provides a simple and feasible indoor test method for accurately testing the internal stress for driving the recovery and healing performance of the asphalt cement, and defines new physical quantity to represent the self-healing characteristic of the asphalt cement.
Description
Technical Field
The invention relates to the field of road engineering, in particular to an internal stress test method for driving asphalt cement to recover and heal.
Background
With the vigorous development of the traffic industry in China, the total mileage of the expressway is continuously increased, and the annual expense for highway maintenance is also increasing. Asphalt pavement is used as the most common pavement form of expressways in China, and diseases of the asphalt pavement are always the problems to be solved urgently by vast road workers. Self-healing, one of the most typical and important characteristics of asphalt pavement, has been widely reported as a related influence study on the service of road structures, and has a great potential for reducing road maintenance costs and reducing greenhouse gas emissions to protect the environment. Internal stress is a driving force for generating self-healing properties of asphalt pavement, and is mainly generated in asphalt cement components, but currently, tests and researches on internal stress of asphalt are rarely involved, only creep step load recovery test methods have been proposed ([ 1]Fuquan Ma,Xue Luo,Zhiyi Huang,Jinchang Wang.Characterization of Recovery in Asphalt Binders[J ]. Materials,2020,13 (4)), and no patent has been made so far regarding internal stress test methods for driving recovery and healing properties in asphalt cement.
Disclosure of Invention
The invention provides a simple and effective internal stress test method for accurately testing and driving the recovery and healing characteristics of asphalt cement, which is used for simplifying the existing test method, improving the internal stress test accuracy and test efficiency, defining a new physical quantity-healing modulus according to the internal stress test accuracy and test efficiency, and representing the self-healing characteristics of different asphalt cements.
In order to accurately test the internal stress driving the performance recovery and healing characteristics of the asphalt cement, the invention provides a novel internal stress test method and a prediction model for the asphalt cement based on the principle of the internal stress test method (creep and step load recovery test) in the existing asphalt cement.
An internal stress test method for simply and effectively realizing the recovery and healing characteristics of asphalt cement comprises the following steps:
1) Dripping the heated asphalt cement into a silica gel mold, and cooling to obtain a sample;
2) Setting test conditions in a dynamic shear rheometer, including a creep loading test and a zero strain rate recovery test;
3) The test is carried out on the sample by using parallel plates according to the set test conditions of the dynamic shear rheometer, and different stress values and residual strain values which are increased along with the time are output and recorded;
4) According to the force balance principle, the magnitude of a stress value output by the dynamic shear rheometer is equal to the internal stress, and according to a test result, a prediction model of the internal stress is given:
wherein sigma i Is internal stress, t is recovery time, and a, b, c and d are model parameters.
5) Considering that internal stress and residual strain are the driving forces and manifestations of asphalt cement recovery and healing properties, a new physical quantity, the healing modulus, is now defined to characterize the self-healing capacity properties of different asphalt cements:
wherein H is the healing modulus, ε r Is the residual strain.
In the invention, in the step 2), the test conditions set in the dynamic shear rheometer comprise two parts, namely a creep loading test part and a zero strain rate recovery test part;
in the invention, the creep loading test part can be a nondestructive test or a destructive test;
in the invention, the zero strain rate recovery test part sets a strain value to be constant along with time increase for depending on a dynamic shear rheometer;
in the present invention, in step 3), the test sample is tested using 6 to 10mm (more preferably 7 to 9mm,8 mm) parallel plates according to the set dynamic shear rheometer test conditions. The creep loading test part and the zero strain rate recovery test part are respectively supported by 8mm parallel plates in a dynamic shear rheometer;
in the invention, the internal stress implementation temperature for simply and effectively realizing accurate test of the recovery and healing characteristics of the asphalt cement is 15-35 ℃, and the asphalt cement can be accessed according to the property difference of different types of cements and the different torque ranges of a dynamic shear rheometer; namely, the implementation temperature of the internal stress test of the dynamic shear rheometer is 15-35 ℃.
In the invention, the different stress values of the output which are increased along with time are considered to be the same in stress magnitude and internal stress value according to the force balance principle.
Compared with the prior art, the invention has the beneficial effects that:
(1) The method is implemented by means of a dynamic shear rheometer, and is mainly used for testing the internal stress of the asphalt cement in the recovery stage after the loading stage, and the principle is that the residual strain of the recovery stage is set to be unchanged in the recovery stage after the loading of the asphalt cement. Considering that the residual strain of the asphalt cement is continuously reduced under the drive of the internal stress without any applied force during the unloading stage, when the strain rate is kept at zero and kept unchanged over time, the internal stress balances with the external stress, and the value of the outputted external stress is regarded as the corresponding magnitude of the internal stress. The method is simple and flexible, is convenient to use, provides a simple and feasible indoor test method for accurately testing the internal stress for driving the recovery and healing performance of the asphalt cement, and provides a relevant prediction model according to the test result.
(2) On the premise of ensuring accurate test results, the invention overcomes the defects of experience dependence, complicated operation, time consumption, low success rate, limited test points, smaller test range, requirement for a multistage fitting equation and the like of the existing internal stress test method of the asphalt cement;
(3) The invention can simply and effectively realize the acquisition and test of the internal stress of the asphalt cement, has ideal effect and universality, and is suitable for common matrix asphalt and SBS modified asphalt;
(4) The invention has important practical significance in the aspects of researching the recovery and healing characteristics of the asphalt pavement, prolonging the service life of the actual service asphalt pavement, enhancing the driving comfort and the like.
(5) According to the internal stress test method for driving the asphalt cement to recover and heal, a new physical quantity, namely healing modulus, is defined by considering that the internal stress is a source power for driving the asphalt cement to recover and heal, and the self-healing capacity of the asphalt cement is more intuitively and effectively represented by a combination dynamics method.
Drawings
FIG. 1 is a flow chart of a method for testing internal stress driving asphalt cement recovery and healing characteristics provided by the practice of the present invention.
FIG. 2 is a schematic diagram of a method for testing internal stress driving asphalt cement recovery and healing characteristics in accordance with an embodiment of the present invention.
FIG. 3 is a graph comparing the results of stress in non-destructive conditions in example 1 of the present invention and comparative verification example 1.
FIG. 4 is a graph of comparative and model predictive results for stress results in lossy conditions in specific example 2 of the present invention and comparative verification example 2.
FIG. 5 is a graph showing the results of the healing modulus of non-destructive and lossy base asphalt of example 3 of the present invention at different temperatures.
FIG. 6 is a graph showing the healing activation energy results of the matrix asphalt and SBS modified asphalt of example 3 of the present invention.
Detailed Description
The invention provides an internal stress test method for realizing the performance recovery and healing characteristics of driving asphalt cement and application thereof, comprising the following steps:
dripping the heated asphalt cement into a silica gel mold, and cooling to obtain a sample;
setting test conditions in a dynamic shear rheometer, including a creep loading test and a zero strain rate recovery test;
the test is carried out on the sample by using an 8mm parallel plate according to the set test condition of the dynamic shear rheometer, and different stress values which are increased along with the time are output and recorded;
the magnitude of the stress value of the output is equal to the internal stress according to the force balance principle. And then, according to the test result, giving a prediction model of the internal stress.
In the invention, the test conditions set in the dynamic shear rheometer comprise two parts, namely a creep loading test part and a zero strain rate recovery test part;
in the invention, the creep loading test part can be a nondestructive test or a destructive test;
in the invention, the zero strain rate recovery test part sets a strain value to be constant along with time increase for depending on a dynamic shear rheometer;
in the invention, the creep loading test part and the zero strain rate recovery test part are respectively supported by 8mm parallel plates in a dynamic shear rheometer;
in the invention, the temperature of the internal stress testing method for simply and effectively realizing accurate testing of the recovery and healing characteristics of the driving asphalt cement is 15-35 ℃, and the driving asphalt cement can come in and go out according to the property difference of different types of cements and the different torque ranges of the dynamic shear rheometer;
in the invention, the output values of the stress and the residual strain which are different with time increase are considered to be the same in stress magnitude and internal stress value according to the force balance principle.
In the present invention, based on the measured internal stress and residual strain, a new physical quantity, the healing modulus, is calculated and used to characterize the self-healing capacity of asphalt cement by the method of binding kinetics.
Fig. 1 is a schematic diagram of an internal stress testing method for asphalt cement, which is provided by the invention, wherein the principle is that after creep loading, a strain value is kept to be a constant value (the strain rate is zero), and the applied external stress is equal to the internal stress according to the balance condition of force, so that the internal stress value can be output.
Fig. 2 is a flow chart of the method for testing internal stress of asphalt cement, which mainly comprises four parts, namely: manufacturing an asphalt cement sample, setting test program information, performing a test, and recording and outputting an internal stress value.
For further explanation of the present invention, the following describes and verifies in detail the internal stress test method of an asphalt cement provided by the present invention in connection with examples, which should not be construed as limiting the scope of the present invention.
Example 1
Selecting a matrix asphalt material, heating in an oven to prepare a sample, and then performing a test at the test temperature of 35 ℃, wherein the test part mainly comprises a nondestructive creep zero strain rate recovery test, the nondestructive creep stress is respectively 100Pa, 500Pa and 1000Pa, the creep loading time is 200s, the zero strain rate recovery time is 300s, and the total test time is 500s, and the main purpose is to test the internal stress of the matrix asphalt under the nondestructive condition by using the method
Comparative verification example 1
From the test results in example 1, internal stress of asphalt cement under non-destructive conditions was calculated according to the viscoelastic theory, and a comparison of the model predicted results and those in example 1 was made.
Example 2
After a matrix asphalt material is selected and heated in an oven to prepare a sample, the sample is tested at the test temperature of 15 ℃, 25 ℃ and 35 ℃, the test part mainly comprises a lossy creep zero strain rate recovery test, the corresponding creep loads are 100000Pa, 70000Pa and 10000Pa respectively, the creep loading time is 200s, the zero strain rate recovery time is 300s, and the total test time is 500s, and the main purpose is to test the internal stress of the matrix asphalt under the lossy condition by using the method.
Comparative verification example 2
After a matrix asphalt material is selected and heated in an oven to prepare a sample, the sample is tested at the test temperature of 15 ℃, 25 ℃ and 35 ℃, the test part is mainly a lossy creep step load recovery test, the corresponding creep loads are 100000Pa, 70000Pa and 10000Pa respectively, the creep loading time is 200s, the zero strain rate recovery time is 300s, the total test time is 500s, and the main purpose is to test the internal stress of the matrix asphalt under the lossy condition by utilizing the existing creep step load recovery test and verify the accuracy of the test result and the model estimated result of the method in the embodiment 2.
FIG. 3 shows the results of example 1 and comparative verification example 1, i.e., the comparison of internal stress test values and theoretical calculated values of three different non-destructive stress underwater conditions of a matrix asphalt at 35 DEG C
FIG. 4 shows the results of example 2, comparative verification example 2 and predictive model, i.e., the results of the internal stress test and the results of the predictive model of the matrix asphalt tested by the method of the present invention (creep zero strain rate recovery test), creep step load recovery test at 15℃and 25℃and 35℃
Therefore, no matter under the condition that asphalt is lossless or lossy, the error value between the test value and the verification value of the method is smaller, and the matching is good, so that the method has higher accuracy and practicability; under the condition of no damage and damage, the matching degree of the prediction model and the actual measurement result is higher, which indicates that the fitting prediction model has higher precision.
In the application of this internal stress test method to drive asphalt cement performance recovery and healing characteristics, the healing modulus is described in detail in connection with the example solution, but they are not to be construed as limiting the scope of the invention.
Example 3
After a sample is prepared by heating a matrix asphalt and an SBS modified material in an oven, the test is carried out at the test temperature of 15 ℃, 25 ℃ and 35 ℃, and the test part mainly comprises a creep zero strain rate recovery test, wherein the creep zero strain rate recovery test comprises two loading states of no damage and damage, the loading time is 200s, the zero strain rate recovery time is 80s and the total time is 280s. The method is mainly used for applying an internal stress test method for driving the performance recovery and healing characteristics of asphalt cements, and the self-healing capacity of two asphalt cements is represented by solving a newly defined healing modulus and the healing activation energy in a dynamic Arrhenius equation.
FIG. 5 shows the healing modulus results for the matrix asphalt of example 3, i.e., the healing modulus results for both the non-destructive and lossy matrix asphalt at 15 ℃, 25 ℃ and 35 ℃.
Fig. 6 shows the healing activation energy results of the matrix asphalt and the SBS modified asphalt of example 3, i.e., the healing activation energy of the arrhenius equation in the kinetic theory was solved according to the healing modulus results of the matrix asphalt and the SBS modified asphalt.
It can be seen that the results of the healing modulus at different temperatures obtained by calculation according to the measured internal stress are obviously distinguished, and the physical characteristics of the healing modulus reaction asphalt cement are demonstrated; in addition, according to the healing modulus of the matrix asphalt and the SBS modified asphalt at different temperatures, the healing activation energy of an Arrhenius equation in a computational dynamics theory is larger than that of the SBS modified asphalt, and the self-healing capacity of the SBS modified asphalt is higher, which is verified in related research literature. This further demonstrates the accuracy of the internal stress test method of the present invention and the application effect of the new physical quantity defined thereby-good healing modulus, indicating the effectiveness of the internal stress test method of asphalt of the present invention driving recovery and healing characteristics and the practical application effect of defining good healing modulus based thereon.
The foregoing description is merely illustrative of the present invention and is not intended to be in any way limiting. It should be noted that it will be apparent to those skilled in the art and to researchers that modifications and variations can be made without departing from the principles of the present invention, such as adding fatigue loads prior to the creep stage, and such modifications and variations are also considered to be within the scope of the present invention.
Claims (4)
1. An internal stress test method for driving asphalt cement to recover and heal is characterized by comprising the following steps:
1) Dripping the heated asphalt cement into a silica gel mold, and cooling to obtain a sample;
2) Setting test conditions in a dynamic shear rheometer, including a creep loading test and a zero strain rate recovery test;
the zero strain rate recovery test is to set a strain value to be unchanged along with the time increase by depending on a dynamic shear rheometer;
3) The test is carried out on the sample by using a parallel plate with the thickness of 6-10 mm according to the set test conditions of the dynamic shear rheometer, and different stress values and residual strain values which are increased along with the time are output and recorded;
the implementation temperature of the internal stress test of the dynamic shear rheometer is 15-35 ℃;
4) According to the force balance principle, the magnitude of a stress value output by the dynamic shear rheometer is equal to the internal stress, and according to a test result, a prediction model of the internal stress is given:
wherein the method comprises the steps of，σ i Is internal stress, t is recovery time, a, b, c and d are model parameters;
5) Considering that internal stress and residual strain are the driving force and manifestation of asphalt cement recovery and healing properties, expressed in terms of healing modulus, are used to characterize the self-healing capacity properties of different asphalt cements:
wherein H is the healing modulus, ε r Is the residual strain.
2. The method of claim 1, wherein in step 2), the creep-loading test is a non-destructive test or a destructive test.
3. The method for testing internal stress for driving asphalt cement to recover and heal according to claim 1, wherein in the step 3), the test specimen is tested according to the set test conditions of the dynamic shear rheometer using 7-9 mm parallel plates.
4. A method of testing internal stress for driving asphalt cement recovery and healing according to claim 3, wherein in step 3), the test specimen is tested using 8mm parallel plates according to the set dynamic shear rheometer test conditions.
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Citations (4)
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|---|---|---|---|---|
| CN102297811A (en) * | 2011-05-27 | 2011-12-28 | 长安大学 | Method for detecting inter-laminar shear stress and strain of asphalt road |
| CN102735553A (en) * | 2011-04-01 | 2012-10-17 | 同济大学 | Test method for testing shear performance of asphalt binder |
| CN108801738A (en) * | 2018-07-20 | 2018-11-13 | 武汉理工大学 | Impact analysis method of the humidity to Dynamic Modulus of Asphalt Mixture |
| CN111551457A (en) * | 2020-05-18 | 2020-08-18 | 合肥工业大学 | Method for testing and evaluating asphalt healing performance |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102735553A (en) * | 2011-04-01 | 2012-10-17 | 同济大学 | Test method for testing shear performance of asphalt binder |
| CN102297811A (en) * | 2011-05-27 | 2011-12-28 | 长安大学 | Method for detecting inter-laminar shear stress and strain of asphalt road |
| CN108801738A (en) * | 2018-07-20 | 2018-11-13 | 武汉理工大学 | Impact analysis method of the humidity to Dynamic Modulus of Asphalt Mixture |
| CN111551457A (en) * | 2020-05-18 | 2020-08-18 | 合肥工业大学 | Method for testing and evaluating asphalt healing performance |
Non-Patent Citations (2)
| Title |
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| Characterization of Recovery in Asphalt Binders;Fuquan Ma etc.;《materials》;20200219;1-7 * |
| 李恒德 等.5 材料性能、测试 与使用行为.《现代材料科学与工程辞典》.2001, * |
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