CN113433304B - Method for testing and evaluating self-healing performance of asphalt - Google Patents
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- 239000010426 asphalt Substances 0.000 title claims abstract description 115
- 238000012360 testing method Methods 0.000 title claims abstract description 101
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000009661 fatigue test Methods 0.000 claims abstract description 70
- 230000035876 healing Effects 0.000 claims abstract description 39
- 239000000463 material Substances 0.000 claims abstract description 16
- 238000011084 recovery Methods 0.000 claims description 33
- 238000010008 shearing Methods 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 3
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Abstract
The invention discloses a method for testing and evaluating self-healing performance of asphalt, belongs to the field of asphalt material performance detection, and aims to solve the problem that a testing method and an evaluation index for effectively and accurately evaluating the self-healing performance of an asphalt material are lacked in the conventional asphalt self-healing performance evaluation. Test and evaluation methods: linear, linearPerforming amplitude scanning test; secondly, (1) a low strain time scanning test, wherein the strain amplitude value applied to the asphalt sample by utilizing a dynamic shear rheometer is epsilonsLow strain time sweep test of (2); (2) reduced to | G with dynamic shear modulus*|DPerforming a fatigue test I as a termination condition of the fatigue test I; (3) respectively carrying out low-strain time scanning tests in the initial stage and the final stage of the intermittent healing period; (4) fatigue test II; and thirdly, calculating a healing index for representing the healing performance of the asphalt. The index provided by the invention is based on the asphalt self-healing mechanism, and can effectively represent the asphalt self-healing process.
Description
Technical Field
The invention belongs to the field of asphalt material performance detection, and particularly relates to an evaluation method for asphalt self-healing performance.
Background
Asphalt material is a viscoelastic material with self-healing properties and is widely used in the construction of road surfaces and airport pavement. In the long-term service process of the asphalt pavement, fatigue damage caused by repeated loading is one of main diseases influencing the service condition of the asphalt pavement. Researches show that under the conditions of proper temperature and no load, the asphalt has the performance of partially or completely healing internal cracks, so that the service life of the pavement is prolonged, and the service condition of the pavement is improved. However, the self-healing characteristic of asphalt is not fully paid attention to in the existing asphalt pavement design process and the asphalt pavement fatigue life estimation, which causes material waste on one hand and cannot reasonably evaluate the service life of the actual service pavement on the other hand. Therefore, the reasonable and accurate quantification of the self-healing capability of the asphalt is particularly critical in the long-life pavement design and pavement durability analysis.
At present, a test method and an evaluation index for self-healing evaluation of asphalt have certain defects. The existing asphalt self-healing test method is a fatigue-intermittence-fatigue test mode, and then the self-healing capability evaluation of asphalt is carried out based on mechanical parameters in two fatigue tests. Because the fatigue load usually exceeds the linear viscoelasticity range of the asphalt, the measured mechanical parameters are influenced by the load level, and the real state of the asphalt can not be accurately reflected. Therefore, if the mechanical parameters of the asphalt at a high load level obtained in the fatigue test process are used as reference values, the evaluation of the self-healing condition of the asphalt will affect the accuracy of the evaluation result. The existing self-healing evaluation indexes mainly comprise three types, namely a modulus type, a fatigue life type and a comprehensive type of the modulus and the fatigue life. The mechanism of asphalt self-healing indicates that the asphalt self-healing process includes recovery of modulus and recovery of fatigue resistance, and the recovery of fatigue resistance lags behind the recovery of modulus. However, none of the existing asphalt self-healing evaluation indexes has the capability of comprehensively representing the modulus and fatigue resistance recovery degree of asphalt and reflecting the difference of the modulus recovery degree and the fatigue resistance recovery degree. Therefore, there is a need to develop a new asphalt self-healing capability testing method and a self-healing evaluation index capable of comprehensively representing asphalt self-healing conditions.
Disclosure of Invention
The invention provides a test method and an evaluation index for evaluating the self-healing performance of an asphalt material, which are used for effectively testing and evaluating the self-healing performance of asphalt, aiming at solving the problem that the existing asphalt self-healing performance evaluation lacks a test method and an evaluation index for effectively and accurately evaluating the self-healing performance of the asphalt material.
The method for testing and evaluating the self-healing performance of the asphalt is realized according to the following steps:
step one, Linear amplitude Scan test (LAS)
Keeping the temperature of an asphalt sample at a test temperature, applying sine wave load with gradually increased amplitude to the asphalt sample by using a dynamic shear rheometer to measure a dynamic shear modulus, then obtaining a dynamic shear modulus-strain curve test chart by using the dynamic shear modulus as a vertical coordinate and a strain amplitude as a horizontal coordinate, finding out a data point of which the dynamic modulus value is reduced to 90% of an initial dynamic shear modulus value, wherein the strain amplitude corresponding to the data point is a strain threshold epsilon of a linear viscoelasticity range of an asphalt materialt；
Step two, self-healing test
The self-healing test comprises a low strain time scanning test, a fatigue test I, an intermittent healing period and a fatigue test II, and the process of the self-healing test is as follows:
(1) low strain time sweep test
The (new) asphalt sample is insulated at the test temperature, and the strain amplitude value of the asphalt sample is epsilon by utilizing a dynamic shear rheometersLow strain time sweep test ofs＜εtCalculating the mean value of the dynamic shear modulus within the loading time as the nondestructive dynamic shear modulus value | G of the asphalt sample*|0；
(2) Fatigue test I
Selecting the strain level epsilon of the fatigue test according to the dynamic shear modulus-strain curve test chart in the step oneLAnd is epsilonL＞εtReduced to | G with dynamic shear modulus*|DAs the termination condition of the fatigue test I, the total number of times N of loading at the termination of the fatigue test I was recorded0；
(3) Intermittent healing period
After the fatigue test I is finished, the load is unloaded, and the strain level is respectively carried out to be epsilon in the initial stage and the end stage of the intermittent healing periodsAnd respectively calculating the dynamic shear modulus mean value | G of the low-strain time scanning test at the initial stage and the ending stage of the intermittent healing period for the low-strain time scanning test with the loading duration of 3-5 s*|D0And | G*|DH；
(4) Fatigue test II
Setting the test temperature, the strain amplitude and the loading frequency of the fatigue test II to be consistent with those of the fatigue test I, and setting the finishing condition of the fatigue test II as follows
Namely, the dynamic shear modulus value is less than or equal to the dynamic shear modulus value when the fatigue test I is finished, and the cycle number N of the loading of the fatigue test II is recorded1；
Step three, shearing the modulus value | G according to the lossless dynamic state*|0Dynamic shear modulus | G of low strain time sweep test at initial stage of intermittent healing period*|D0Dynamic shear modulus | G obtained by low strain time scanning test at the end stage of intermission period*|DHFatigue test I number of loading N0And fatigue test II number of times of loading N1Calculating a healing index representing the healing performance of the asphalt, wherein the calculation formula is shown in formulas (1) to (5);
wherein HI' is the degree of recovery of the asphalt modulus; HI ″, the degree of recovery of fatigue resistance of asphalt; | HI*The degree of healing of the overall performance of the asphalt; tan delta characterizes the difference between the degree of recovery of fatigue resistance and the degree of recovery of modulus of asphalt.
The method for testing and evaluating the self-healing performance of the asphalt has the following beneficial effects:
a low-strain time scanning test is added before the first fatigue test, and is used for obtaining mechanical parameters of the asphalt material in a nondestructive state; a low strain time sweep test is added at the initial and final stages of the intermittent healing period to monitor the recovery of the modulus of the asphalt material. Because the linear viscoelastic parameter of the asphalt is irrelevant to the load level, the test method has more representative representation on the complete degree of the asphalt by adopting the linear viscoelastic parameter obtained by a small load level.
In the aspect of the self-healing evaluation index of the asphalt, the evaluation index provided by the invention is an index in a complex form, has richer physical meaning, the real part HI' of the complex self-healing index represents the recovery degree of the modulus of the asphalt material, the imaginary part HI represents the recovery degree of the durability of the asphalt material, and the modulus HI of the complex self-healing index*And | represents the comprehensive self-healing degree of the asphalt material, and the ratio tan delta of the imaginary part and the real part represents the difference between the recovery condition of the durability performance and the modulus recovery condition. The index provided by the invention is based on the self-healing mechanism of the asphalt, and can effectively represent the self-healing process of the asphalt, while the physical significance which can be represented by the conventional self-healing evaluation index is single, so that the self-healing process of the asphalt is difficult to effectively represent.
Drawings
FIG. 1 is a schematic diagram of a self-healing test process of asphalt in an embodiment;
FIG. 2 is a schematic diagram of the low strain time sweep test applied during the initial and final stages of the intermittent healing period in the examples.
Detailed Description
The first embodiment is as follows: the method for testing and evaluating the self-healing performance of the asphalt is implemented according to the following steps:
step one, Linear amplitude Scan test (LAS)
Mixing asphalt samples inKeeping the temperature at the test temperature, applying sine wave load with gradually increased amplitude to the asphalt sample by using a dynamic shear rheometer to measure the dynamic shear modulus, then obtaining a dynamic shear modulus-strain curve test chart by using the dynamic shear modulus as a vertical coordinate and the strain amplitude as a horizontal coordinate, finding out a data point of which the dynamic modulus value is reduced to 90% of the initial dynamic shear modulus value, wherein the strain amplitude corresponding to the data point is the strain threshold value epsilon of the linear viscoelasticity range of the asphalt materialt；
Step two, self-healing test
The self-healing test comprises a low strain time scanning test, a fatigue test I, an intermittent healing period and a fatigue test II, and the process of the self-healing test is as follows:
(1) low strain time sweep test
The (new) asphalt sample is insulated at the test temperature, and the strain amplitude value of the asphalt sample is epsilon by utilizing a dynamic shear rheometersLow strain time sweep test ofs＜εtCalculating the mean value of the dynamic shear modulus within the loading time as the nondestructive dynamic shear modulus value | G of the asphalt sample*|0；
(2) Fatigue test I
Selecting the strain level epsilon of the fatigue test according to the dynamic shear modulus-strain curve test chart in the step oneLAnd is epsilonL＞εtReduced to | G with dynamic shear modulus*|DAs the termination condition of the fatigue test I, the total number of times N of loading at the termination of the fatigue test I was recorded0；
(3) Intermittent healing period
After the fatigue test I is finished, the load is unloaded, and the strain level is respectively carried out to be epsilon in the initial stage and the end stage of the intermittent healing periodsAnd respectively calculating the dynamic shear modulus mean | G of the low-strain time scanning test at the initial stage and the final stage of the intermittent healing period for the low-strain time scanning test with the loading duration of 3-5 s*|D0And | G*|DH；
(4) Fatigue test II
Set fatigue testThe test temperature, the strain amplitude and the loading frequency of the test II are consistent with those of the fatigue test I, and the end conditions of the fatigue test II are set as
Namely, the dynamic shear modulus value is less than or equal to the dynamic shear modulus value when the fatigue test I is finished, and the cycle number N of the loading of the fatigue test II is recorded1；
Step three, shearing the modulus value | G according to the lossless dynamic state*|0Dynamic shear modulus | G of low strain time sweep test at initial stage of intermittent healing period*|D0Dynamic shear modulus | G obtained by low strain time scanning test at the end stage of intermission period*|DHFatigue test I number of loading N0And fatigue test II number of times of loading N1Calculating a healing index representing the healing performance of the asphalt, wherein the calculation formula is shown in formulas (1) to (5);
wherein HI' is the degree of recovery of the asphalt modulus; HI ″, the degree of recovery of fatigue resistance of asphalt; | HI*The degree of healing of the overall performance of the asphalt; tan delta-characteristic asphalt anti-fatigueDifference between strain recovery and modulus recovery.
Strain threshold epsilon of the present embodimenttGenerally 1% to 3%.
In the fatigue test I of this embodiment, the termination condition may be a loading frequency control manner or a modulus value control manner, that is, the test is terminated when the total loading frequency reaches a certain value or the dynamic shear modulus decreases to a certain value.
The second embodiment is as follows: the difference between the present embodiment and the first embodiment is that the test temperature in the first step is 10-30 ℃.
The third concrete implementation mode: the difference between the first embodiment and the second embodiment is that the heat preservation time of the asphalt sample at the test temperature in the first step is 20-40 min.
The fourth concrete implementation mode: the difference between this embodiment and one of the first to third embodiments is that the frequency of the sine wave load with gradually increasing amplitude in the first step is 1Hz to 10 Hz.
The fifth concrete implementation mode: the difference between this embodiment and one of the first to the fourth embodiments is that the sine wave load applied in the first step is set to have an initial value of strain amplitude of 0.1%, a final value of strain amplitude of 30%, and an interval of 0.1%.
The sixth specific implementation mode: the difference between this embodiment and one of the first to fifth embodiments is that the loading time in the low strain time scanning test is 6 to 30 s.
The seventh embodiment: the difference between this embodiment and one of the first to sixth embodiments is that the dynamic modulus | G is set during the fatigue test I*|DThe ratio of the initial dynamic modulus value to the initial dynamic modulus value is 0.3-0.8.
The specific implementation mode is eight: the seventh embodiment is different from the seventh embodiment in that a dynamic modulus value | G is set in the fatigue test I process*|DThe ratio of the initial dynamic modulus value to the initial dynamic modulus value is 0.5-0.7.
The specific implementation method nine: this embodiment is different from the first to eighth embodiments in that the intermittent operation is performedThe initial and final stages of the healing period are each subjected to a strain level of epsilons0.1% and a low strain time sweep test with a loading duration of 5 s.
The detailed implementation mode is ten: the present embodiment is different from one of the first to ninth embodiments in that the total time of the intermittent healing period is set to 2min to 120 min.
Example (b): the method for testing and evaluating the self-healing performance of the asphalt is implemented according to the following steps:
step one, Linear amplitude Scan test (LAS)
Keeping the temperature of an asphalt sample at a test temperature of 20 ℃ for 30min, applying a sine wave load with the frequency of 10Hz, the strain amplitude of 0.1 percent as an initial value, the strain amplitude of 30 percent as an end value and the interval of 0.1 percent with gradually increasing amplitude to the asphalt sample by using a dynamic shear rheometer to measure dynamic shear modulus data, then obtaining a dynamic shear modulus-strain curve test chart by using the dynamic shear modulus as a vertical coordinate and the strain amplitude as a horizontal coordinate, finding out a data point with the dynamic modulus value reduced to 90 percent of the initial dynamic shear modulus value, wherein the strain amplitude corresponding to the data point is a strain threshold value epsilon of the linear viscoelasticity range of the asphalt materialt，εt＝2.6％；
Step two, self-healing test
The self-healing test comprises a low strain time scanning test, a fatigue test I, an intermittent healing period and a fatigue test II, and the process of the self-healing test is as follows:
(1) low strain time sweep test
The new asphalt sample is insulated for 30min at the test temperature of 20 ℃, and the asphalt sample is loaded by a dynamic shear rheometer with the loading frequency of 10Hz and the strain amplitude of epsilons0.1% low strain time sweep test, 10s loading duration, calculating the mean value of dynamic shear modulus within 10s as the value of nondestructive dynamic shear modulus | G of the asphalt sample*|0；
(2) Fatigue test I
Selecting the strain level epsilon of the fatigue test according to the dynamic shear modulus-strain curve test chart in the step oneL，εL4% in modulus value | G*|DThe initial modulus is reduced to 0.65 times as the end condition of the fatigue test I, and the asphalt sample is continuously applied with the strain level epsilon at the temperature of 20 DEG CLLoading a sine wave load with the frequency of 10Hz and recording the loading times N0；
(3) Intermittent healing period
After the fatigue test I is finished, the load is unloaded, and the strain level is set to be epsilon in the initial stage and the end stage of the intermittent healing periodsA low strain time scanning test with the loading time of 5s and the loading time of 0.1 percent is used for monitoring the recovery condition of the modulus of the asphalt sample, and the dynamic shear modulus | G of the initial stage and the ending stage of the intermittent healing period is recorded*|D0And | G*|DH；
(4) Fatigue test II
Setting the test temperature, the strain amplitude and the loading frequency of the fatigue test II to be consistent with those of the fatigue test I, and setting the finishing condition of the fatigue test II as follows
Namely, the dynamic shear modulus value is less than or equal to the dynamic shear modulus value when the fatigue test I is finished, and the cycle number N of the loading of the fatigue test II is recorded1；
Step three, shearing the modulus value | G according to the lossless dynamic state*|0Dynamic shear modulus | G of low strain time scanning test in initial stage of intermittence period*|D0Dynamic shear modulus | G obtained by low strain time scanning test at the end stage of intermission period*|DHFatigue test I number of loading N0And fatigue test II number of times of loading N1The calculation formula is shown in formulas (1) to (5);
wherein HI' is the degree of recovery of the asphalt modulus; HI ″, the degree of recovery of fatigue resistance of asphalt; | HI*The degree of healing of the overall performance of the asphalt; tan delta characterizes the difference between the degree of recovery of fatigue resistance and the degree of recovery of modulus of asphalt.
The calculation result of the self-healing performance of the asphalt in this example is as follows:
analysis of the data in the Table shows that the longer the rest period, HI' and | HI at the same lesion level*The larger the value of | is, the higher the recovery degree of modulus recovery and fatigue durability of the asphalt is, the better the self-healing effect of the asphalt is, and the self-healing effect is consistent with the actual situation; the ratio tan delta of HI "to HI' was less than 1 at different batch times, indicating that the recovery of fatigue durability of the asphalt was less than the recovery of modulus. The reflected conditions are consistent with the actual conditions and are consistent with the self-healing theory, and the effectiveness of the asphalt self-healing test method and the evaluation index provided by the invention is proved.
Claims (10)
1. The method for testing and evaluating the self-healing performance of the asphalt is characterized by being realized according to the following steps:
step one, linear amplitude scanning test
Keeping the temperature of an asphalt sample at a test temperature, applying sine wave load with gradually increased amplitude to the asphalt sample by using a dynamic shear rheometer to measure a dynamic shear modulus, then obtaining a dynamic shear modulus-strain curve test chart by using the dynamic shear modulus as a vertical coordinate and a strain amplitude as a horizontal coordinate, finding out a data point of which the dynamic modulus value is reduced to 90% of an initial dynamic shear modulus value, wherein the strain amplitude corresponding to the data point is a strain threshold epsilon of a linear viscoelasticity range of an asphalt materialt；
Step two, self-healing test
The self-healing test comprises a low strain time scanning test, a fatigue test I, an intermittent healing period and a fatigue test II, and the process of the self-healing test is as follows:
(1) low strain time sweep test
The asphalt sample is insulated at the test temperature, and the strain amplitude value of the asphalt sample is epsilon by utilizing a dynamic shear rheometersLow strain time sweep test ofs＜εtCalculating the mean value of the dynamic shear modulus within the loading time as the nondestructive dynamic shear modulus value | G of the asphalt sample*|0；
(2) Fatigue test I
Selecting the strain level epsilon of the fatigue test according to the dynamic shear modulus-strain curve test chart in the step oneLAnd is epsilonL＞εtReduced to | G with dynamic shear modulus*|DAs the termination condition of the fatigue test I, the total number of times N of loading at the termination of the fatigue test I was recorded0；
(3) Intermittent healing period
After the fatigue test I is finished, the load is unloaded, and the strain level is respectively carried out to be epsilon in the initial stage and the end stage of the intermittent healing periodsAnd respectively calculating the dynamic shear modulus mean value | G of the low-strain time scanning test at the initial stage and the ending stage of the intermittent healing period for the low-strain time scanning test with the loading duration of 3-5 s*|D0And | G*|DH；
(4) Fatigue test II
Setting the test temperature, the strain amplitude and the loading frequency of the fatigue test II to be consistent with those of the fatigue test I, and setting the finishing condition of the fatigue test II as follows
Namely, the dynamic shear modulus value is less than or equal to the dynamic shear modulus value when the fatigue test I is finished, and the cycle number N of the loading of the fatigue test II is recorded1；
Step three, shearing the modulus value | G according to the lossless dynamic state*|0Dynamic shear modulus | G of low strain time sweep test at initial stage of intermittent healing period*|D0Dynamic shear modulus | G obtained by low strain time scanning test at the end stage of intermission period*|DHFatigue test I number of loading N0And number of cycles N of fatigue test II1Calculating a healing index representing the healing performance of the asphalt, wherein the calculation formula is shown in formulas (1) to (5);
wherein HI' is the degree of recovery of the asphalt modulus; HIThe recovery degree of the fatigue resistance of asphalt; | HI*The degree of healing of the overall performance of the asphalt; tan delta characterizes the difference between the degree of recovery of fatigue resistance and the degree of recovery of modulus of asphalt.
2. The method for testing and evaluating self-healing performance of asphalt according to claim 1, wherein the testing temperature in the first step is 10 ℃ to 30 ℃.
3. The method for testing and evaluating self-healing performance of asphalt according to claim 1, wherein in the first step, the asphalt sample is kept at the testing temperature for 20-40 min.
4. A method for testing and evaluating self-healing performance of asphalt according to claim 1, wherein the frequency of the sine wave load with gradually increasing amplitude in the first step is 1Hz to 10 Hz.
5. A method for testing and evaluating self-healing performance of asphalt according to claim 1, wherein the sine wave load applied in the first step is an initial value with a strain amplitude of 0.1%, a final value with a strain amplitude of 30%, and an interval of 0.1%.
6. The method for testing and evaluating the self-healing performance of asphalt according to claim 1, wherein the loading time in the low strain time scanning test is 6-30 s.
7. The method for testing and evaluating self-healing performance of asphalt according to claim 1, wherein the dynamic modulus value | G is set during the fatigue test I*|DThe ratio of the initial dynamic modulus value to the initial dynamic modulus value is 0.3-0.8.
8. The method for testing and evaluating self-healing performance of asphalt according to claim 7, wherein the dynamic modulus value | G is set during the fatigue test I*|DThe ratio to the initial dynamic modulus value is0.5～0.7。
9. A method for testing and evaluating self-healing performance of asphalt according to claim 1, wherein the initial stage and the final stage of the intermittent healing period are respectively performed with a strain level of epsilons0.1% and a low strain time sweep test with a loading duration of 5 s.
10. A method for testing and evaluating self-healing performance of asphalt according to claim 1, wherein the total time of the intermittent healing period is set to 2min to 120 min.
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| CN113686707B (en) * | 2021-09-28 | 2022-04-26 | 哈尔滨工业大学 | Asphalt fatigue performance testing and evaluating method for separating thixotropy and nonlinear influence |
| CN114354403B (en) * | 2021-12-27 | 2022-09-02 | 哈尔滨工业大学 | Method for testing and evaluating self-healing performance of graphene microcapsule asphalt mortar under double-machine mechanism |
| CN114878795B (en) * | 2022-05-31 | 2023-03-21 | 北京工业大学 | Method and device for evaluating self-healing capacity of asphalt damage based on energetics |
| CN116052809B (en) * | 2022-12-28 | 2023-10-10 | 北京工业大学 | Design method and device for bionic asphalt material |
| CN116678718A (en) * | 2023-05-26 | 2023-09-01 | 武汉理工大学 | Asphalt fatigue life prediction method and system |
| CN118275276A (en) * | 2024-04-09 | 2024-07-02 | 北京市政路桥建材集团有限公司 | High-viscosity asphalt fatigue and self-repairing performance testing method |
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