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Low temperature crack resistance of asphalt pavement ability to resist low temperature shrinkage cracks. It has two forms: one is due to the sudden change in temperature caused by the surface layer temperature shrinkage cracking caused by temperature stress exceeds the tensile strength of the asphalt concrete asphalt layer constraints; another temperature fatigue crack, asphalt concrete after a long period of temperature cycling, the asphalt concrete ultimate tensile strain smaller, stress relaxation performance degradation, the cracking temperature stress is less than the tensile strength. Ability of asphalt pavement deformation at high temperatures and low temperature, poor, so no matter what kind of crack, mostly to occur at low temperatures. Departure from the requirements of the low temperature crack resistance of asphalt pavement at low temperature should be lower stiffness and greater resistance to deformation, fatigue cracking and will not be repeated under the action of the traffic load and other factors. In recent years, fracture mechanics and more widely in road engineering asphalt low temperature performance of the report submitted by the United States SHRP research program, the first time the fracture criterion of the elastic-plastic fracture mechanics J-integral as a low temperature cracking of bitumen mixture the evaluation indicators. This issue through this test to evaluate the different graded asphalt mixture at low temperature crack resistance.

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