The cracking of asphalt pavement is the main form of pavement destruction in cold area. This cracking is the result of multi-factor interaction. It can be divided into external and internal factors. The external factors are mainly climate and environmental factors, which are related to temperature and cooling rate. And stone properties, asphalt mixture composition, asphalt film thickness and so on. Asphalt pavement low temperature cracks phenomenon is universal, control of asphalt pavement low temperature shrinkage is very important and urgent. The bending test was carried out under the condition of temperature -10 �� and loading rate 50mm / min using MTS-810 universal testing machine (TESTSTAR-�� type, temperature control accuracy �� 0.1 ��), and the bending failure strain was used as an index Low Temperature Crack Resistance of Asphalt Mixture. The experimental results show that the three grades of low temperature bending strain index can meet the technical requirements of "Asphalt pavement construction technical specification" (JTG F40-2004) for ordinary asphalt mixture. The gradation has a certain effect on the low temperature bending strain index of the asphalt mixture, but the effect is not significant. Under the same test conditions, the low temperature crack resistance of 1 # gradation is better than that of the other two gradations. Compressive modulus test The elastic modulus of pavement material is divided into dynamic elastic modulus and static elastic modulus. At present, the resilient modulus used in China is equivalent to the static modulus of elasticity, and the compressive modulus is one of them. The compressive modulus of the pavement material is an important index which reflects the mechanical properties of the pavement material, which reflects the stress-strain characteristic of the material. It is an important parameter in the calculation of the road structure design or the thickness calculation. Therefore, it is reasonable to determine the pavement material The compressive modulus is very important for pavement design. The experimental results show that the elastic modulus of AM-20 asphalt crushed stone is in the range of 633 ~ 792. Close to the recommended value for the modulus of the asphalt crushed stone mixture. Although the voids of the 1 #, 2 #, 3 # gradations vary, the resulting modulus of elasticity is comparable. milwaukee concrete vibrator milling machine accessories slurry seal cost per mile new pothole repair technology