Study on Dynamic Response of Thin Asphalt Overlays on Old Cement Concrete Pavement based on Measured Data

In order to detect the dynamic response of accelerate loading facility at the bottom of the asphalt overlays,four structures of the test section have been built,and set-in sensors have been used,and the influence of the axle load,speed and other external environment on white and black pavement structure dynamic have been studied; while the difference between the more gravel and pore asphalt overlays and ordinary asphalt concrete has been studied. The results have shown that the stress and strain of the bottom of the asphalt overlays is against the speed; the strain and stress of pavement with larger flexure is 1. 0 ~ 1.2 times of those with smaller flexure; the strain of pavement with 7cm is 4 times of asphalt overlay with 18cm; asphalt surface layer with more gravel and pore can absorb and dissipate the stress and strain passing from the top of the base.