Dynamic Response of Semi-rigid Base Asphalt Pavement Based on Accelerated Pavement Test

TLDR: In this paper, the dynamic response rule of semi-rigid base asphalt pavement structure under moving load was studied and a full-scale test ground was built, and set-in sensors were used to detect the dynamic responses of accelerate loading facility at the bottom of the surface layer under wheel load, and the influences of the lateral distribution of bottom of surface layer,axle load and temperature on the dynamicresponse of pavement sructure were studied.

Abstract: In order to study the dynamic response rule of semi-rigid base asphalt pavement structure under moving load,a full-scale test ground was built,and set-in sensors were used to detect the dynamic response of accelerate loading facility at the bottom of the surface layer under wheel load,and the influences of the lateral distribution of bottom of surface layer,axle load and temperature on the dynamic response of pavement sructure were studied.Results show that the longitudinal flexural-tensile strain at bottom of surface layer presents alternating strain under moving wheel load and the load position only influences its magnitude.The lateral flexural-tensile strain presents quite complex,and it presents tensile strain at the bottom of the tire crown.It presents compressive strain at the positions of two tires middle and two tires lateral.It presents alternating strain at the bottom of the tire shoulder.The flexural-tensile strain at the bottom of the surface layer can not reflect the pavement damaging condition by the overload trucks.Temperature has significant influence on the dynamic response of the asphalt pavement structure,and the dynamic responses at 30 ℃,40 ℃ and 50 ℃ are respectively equivalent to 3 times,8.9 times and 13.3 times of dynamic response at common temperature state.