A device and method for evaluating the fatigue damage self-healing ability of asphalt mixture
An asphalt mixture, fatigue damage technology, applied in the direction of applying repeated force/pulsation force to test the strength of materials, etc., to achieve the effects of easy acceptance and mastery, reasonable evaluation, and intuitive and easy-to-understand methods
Active Publication Date: 2021-06-25
SOUTHEAST UNIV
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Problems solved by technology
Based on the crack surface energy theory and the crack surface diffusion energy theory, the self-healing mechanism of asphalt concrete fatigue damage can be explained and the behavior equation can be established, but it still needs to be further improved.
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[0040] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.
[0041] As shown in the figure, the environmental insulation box 4 in the present invention is a cabinet-type box body, and the test temperature is intelligently controlled by a temperature control regulator 14, and the temperature control accuracy is ±0.1°C. The environmental insulation box 4 box can be made of polycarbonate, acrylic or other transparent materials, which is convenient for observing the progress of the test, and can carry out experimental research on fatigue damage and self-repair behavior at different temperatures.
[0042] The fatigue loading mode adopted in the present invention is a stress control mode, a haversine pulse load, which is controlled an...
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The invention discloses a method for evaluating the fatigue damage self-repair ability of asphalt mixture and its related equipment. The fatigue bending test of small beams is carried out by using the three-point loading method, which can well simulate the reflection cracks existing in the actual pavement structure and reproduce The mechanical influence of traffic loads on the pavement structure when there are fatigue cracks on the bottom surface of each structural layer of the pavement. The actual evaluation process includes: specimen forming, fatigue loading, damage degree evaluation, self-healing repair and self-repairing ability evaluation. The present invention can establish the evaluation index and test method of the asphalt concrete fatigue damage self-repair behavior under the consideration of the asphalt concrete fatigue damage degree, which can be used to accurately and reasonably evaluate the asphalt concrete fatigue damage self-repair ability, and further guide the long-life asphalt pavement Optimal material selection and optimized design prolong the service life of asphalt pavement.
Description
technical field [0001] The invention belongs to the field of testing the fatigue damage self-repair ability of asphalt mixture, in particular to a device and method for evaluating the fatigue damage self-repair ability of asphalt mixture. Background technique [0002] Asphalt mixture is a heterogeneous, multi-phase and multi-layer composite material system with complex structure, microscopic, mesoscopic and macroscopic characteristics. Under the continuous action of factors such as load, temperature, and time effects, micro-scale micro-defects (micro-cracks, micro-holes, etc.) The strength decreases, so that eventually failure occurs. Some scholars have focused on the crack growth and failure mechanism of materials containing holes, cracks and arbitrary defects, and have also done many confirmatory tests, but the test results obtained are often limited by the changes in test conditions, environmental conditions and other conditions. The complexity of the material itself ma...
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IPC IPC(8): G01N3/36
Inventor 赵晓康杜慧董侨
Owner SOUTHEAST UNIV