Laboratory Study On Structure Of Asphalt Pavement

According to repeated load test of asphalt pavement, the structure is built in the indoor pit. It was summarized that the principle of choosing about resistance strain gauges and the surface-sticking process of gauge, and discussed the survival rate of strain gauge based on the comparison of road roller's compaction mode strong vibration or Static Pressure. The data of time-history curves are collected through the Wheatstone bridge at different temperature and load times, dynamic strain characteristics was analysed. It was compared to the maximum transverse strain at upper layer bottom of different asphalt pavement structures, built the prediction models for strain, and discovered the principle of strain response at upper layer bottom under temperature and load times. The elastic modulus was computed through asphalt pavement temperature fields, then building finite element model, compared the result of finite element calculation with test results. The detection results show:The gate length of resistance strain gauge should not be less than 80mm, and it is related with nominal maximum size of aggregate. Gauges' Survival rate is affected by different compaction model, which is much lower under the strong vibration model The strain at upper layer bottom changes when pavement structure, temperature and load times change, and it has different sensitivities to temperature and load times. Finite element calculation corresponds to test results well, among them, whether test results or finite element results, transverse strain at upper layer bottom of semi-rigid asphalt pavement structure is maximum, followed by asphalt pavement structure with ATB-25 base, it is minimum asphalt pavement structure with graded crushed stone base. The distribution of asphalt layer transverse strain at different depths in the same horizontal position complex, the peak appeared in the range of 4?12cm depth.