Study On Structural Test Of Semi-rigid Asphalt Pavement

In the past on the asphalt pavement layer of stress and strain more than the theoretical calculation method, the mechanical model and parameters as the limitations, the results and the actual existence of a gap often.Computer and data acquisition technology, for the pavement test provides more convenience. Simulate actual conditions of the road structure and to test different conditions of stress and strain within the pavement structure to further the overall performance of pavement structures is important. We used Lab VIEW software platform and NI data acquisition system to writing the procedure to obtain the strain in the structure of the pavement test. We put forward suitable way to calibrate,bury and protect sensors in the the tests of indoor pavement structure.Four different kinds of semi-rigid basement asphalt caused of thickness were test on static load test under different temperature and load conditions, discoving the change rule of internal force with structure parameter in semi-rigid basement asphalt pavement: basic strain increases with load and temperature, and decresae with the thickness of basement and surface. When the basement thickness increases to a certain, its effect for change the bottom strain decreases, the influence on basement strain of pavement load far outweigh other factors. The rules above shows:appropriate increase thickness can reduce fatigue cracking risk, basement thickness is not suitble to be too thick, improving the suface thickness is more benefical for internal strain condition under the same conditions; controling surface load is particularly important for structurefatigue cracking.The 3 different semi-rigid basement pavement structure is measured on static and dynamic load tests under the conditions of different temperature and load. The results show that new semi-rigid pavement structure mechanics performance is superior to the traditional semi-rigid bituminous pavement, the fatigue performance of optimal pavement structure form is hybrid asphalt pavement The results above provide factor reasons for make the traditional semi-rigid basement asphalt pavement perfect.