Method for evaluating low-temperature crack-resisting performance of asphalt mixture
A technology of asphalt mixture and anti-cracking performance, which is applied in the direction of applying stable tension/pressure to test the strength of materials, etc. It can solve the problems of difficult promotion and use, complicated methods, and expensive test equipment for temperature and stress of restrained specimens.
Inactive Publication Date: 2011-06-29
SOUTHEAST UNIV
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Problems solved by technology
However, the temperature stress test equipment for constrained specimens is expensive, the method is complicated, and it is not easy to popularize and use
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[0037] The train of thought of the method for evaluating the low-temperature crack resistance of asphalt mixtures provided by the present invention is to measure the fracture energy and tensile strength of asphalt mixtures respectively through the small beam fracture test and the splitting test, and then draw the asphalt mixture through these two parameters. bilinear curves, and finally use bilinear The curve comprehensively evaluates the low temperature crack resistance of asphalt mixture.
[0038] 1. Trabecular Fracture Test
[0039] Specimen size: According to the general requirements for asphalt mixture forming specimens, the minimum size of the specimen should not be less than 3 times the nominal maximum particle size of the asphalt mixture. Accordingly, an asphalt concrete beam with a length of 30 cm, a height of 6 cm, a width of 6 cm, a span (the length of the part between the supports) of 24 cm, and a cut depth of 1 cm was used. According to my country's "Test Reg...
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The invention provides a method for evaluating low-temperature crack-resisting performance of asphalt mixture, wherein the low-temperature crack-resisting performance of the asphalt mixture is comprehensively evaluated by using tensile strength, rupture energy and disabled displacement according to a cohesion model theory; in the real evaluating process, a bilinear cohesion model curve is directly used to intuitively reflect the crack-resisting ability of the asphalt mixture. The evaluating method provided by the invention is directly related to the evaluating index and the real crack process of the asphalt mixture so that the low-temperature crack-resisting performance of the asphalt mixture can be accurately reflected. Via the evaluating method provided by the invention, the low-temperature crack-resisting performance of various asphalt mixtures is comprehensively evaluated; the real crack-resisting performance of the asphalt pavement is forecast, the understanding to the low-temperature crack-resisting performance of the asphalt mixture is deepened; and a comprehensive evaluating method for the low-temperature crack-resisting performance of the asphalt mixture is provided.
Description
technical field [0001] The invention belongs to the application technical field of mechanical performance evaluation of asphalt mixture, and in particular relates to an evaluation method of low-temperature crack resistance of asphalt mixture. Background technique [0002] With the rapid growth of the national economy, the mileage of high-grade highways in our country is also increasing day by day. As of June 2009, my country has built about 75,000 kilometers of expressways, second only to the United States. In the highways that have been built, most of the road surfaces are asphalt pavement. However, asphalt pavement has various damages during its use, mainly including cracking, rutting, subsidence and loosening. Among them, temperature shrinkage cracks caused by temperature drop are one of the main failure modes of asphalt pavement in cold winter regions. Choosing asphalt mixture with excellent crack resistance is the fundamental way to prevent or delay cracking. Theref...
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IPC IPC(8): G01N3/18
Inventor 赵永利张东黄晓明
Owner SOUTHEAST UNIV