Method for detecting self-healing intensity of asphalt
A self-healing and strength technology of asphalt, which is applied in the direction of applying stable tension/pressure to test the strength of materials, can solve the problems of large discreteness of asphalt mixture, lack of effectiveness, cumbersome process, etc., and achieve intuitive convenience and persuasiveness Strong, wide range of effects
Active Publication Date: 2015-06-17
SOUTHEAST UNIV
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Problems solved by technology
Because there are many unstable factors in the forming and testing process of the specimen, even the asphalt mixture trabecular specimens with the same asphalt material and the same gradation have different modulus and fatigue life, and the test results have great differences. Discrete, so the four-point bending fatigue test cannot effectively characterize the effect of asphalt self-healing
[0005] Based on the current research status of asphalt self-healing, DSR and other tests indirectly study the process and characteristics of asphalt crack self-healing through the changes of test data before and after asphalt self-healing, which cannot directly reflect the characteristics of asphalt self-healing.
For the research on the self-healing of asphalt mixture, due to the inevitable existence of differences in the forming process, the self-healing evaluation results of asphalt mixture have a large dispersion, so the test results lack validity; moreover, the experimental research of asphalt mixture is time-consuming Laborious and cumbersome procedures are not conducive to the development of research work
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[0024] The present invention is further described in conjunction with the accompanying drawings and specific embodiments. In a specific embodiment of the present invention, the implementation process is as follows:
[0025] 1. Put the high temperature resistant tape on the mold 6 completely, so that the sticky side of the tape is exposed from the rectangular hole 5 of the mold, and then fix the mold on a flat table, with the sticky side of the tape facing up;
[0026] 2. Heat the asphalt used for the test to a liquid state, take a little and put it in a paper cup, pour it along the length of the mold hole, and use a shovel to scrape it along the pouring direction of the asphalt, so that the asphalt covers the hole area;
[0027] 3. After the asphalt is slightly cooled, tear off the high temperature resistant tape 4 to obtain the sample asphalt film 2;
[0028] 4. Put one sample of asphalt film upward on a flat table, take another sample of asphalt film and align it with anoth...
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Abstract
The invention discloses a method for detecting self-healing intensity of asphalt. The method mainly comprises the following steps: manufacturing a standard asphalt film by virtue of an adhesive tape and a mold; carrying out a tensile fracture experiment by virtue of a tester; recording a force-displacement curve when the asphalt film is peeled off; and calculating a fracture force characteristic value so as to obtain a self-healing intensity index of the asphalt. On the basis of the principles of interface mechanics and asphalt viscoelasticity as well as time-temperature characteristic analysis on mass test data, experimental data disclosed by the invention can fit with the self-healing intensity theory of a high-molecular polymer and can be used for verifying the correction of a test result. Finally, the self-healing intensity evaluation index disclosed by the invention can be simplified into the average value of fracture force; and the index can accurately reflect the self-healing intensity of the asphalt, and is strong in persuasion, convenient, intuitive, and broad in application scope and has the time-saving effect.
Description
technical field [0001] The invention belongs to the technical field of asphalt self-healing performance testing, in particular to a method for detecting asphalt self-healing strength. Background technique [0002] Asphalt pavement cracks are an important issue affecting the service life and comfort of the pavement, and the cost of pavement maintenance invested by our country for this is very staggering. In this context, researchers at home and abroad have proposed the concept of self-healing asphalt, which is to enhance the self-healing performance of asphalt through asphalt modification, so that it can self-heal through its own unique physical and chemical effects when micro-cracks are generated. Healing behavior, to achieve the purpose of repairing cracks in the road surface. At present, many progresses have been made in the research of self-healing asphalt, and different types of self-healing asphalts with certain practicability have been developed successively. However...
Claims
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Inventor 杨军龚明辉陈怡林姚泽恒宋开明董夏鑫
Owner SOUTHEAST UNIV