Analysis for Dynamic Response of Semi-Rigid Base Asphalt Pavement Based on APT Test

ZHUANG Chuan-yi; YE Ya-li; ZHANG Ning

doi:10.3969/j.issn.1672-0032.2014.03.012

Abstract：In this article, the dynamic response of the semi-rigid asphalt pavement is studied through the acceleration and loading test on the full-scale test road , which provides the basis for the prediction and structural design of pavement performance .Through the APT test road construction with the two structures of cement stabilized macadam and lime-fly ash stabilized macadam , strain gauges , vertical stress sensors and temperature sensors are laid to make the real-time collection of the dynamic stress , strain and deflection of the pavement structure as well as the pavement temperature field , to analyze the correlation between the temperature and the responses of the structural dynamic strain and stress and also the calculation of the pavement layer moduli and mechanical response based on the FWD deflection basin .The research results are as follows .The tensile strain of semi-rigid base layer is less affected by temperature .The structural deflection is greatly affected by the thickness of the semi-rigid base .The thinner the semi-rigid base thickness is , the faster the decline of its modulus is .With the function of repeated loads , the declining rate of tensile strain of semi-rigid base layer increases first and then slowly decreases .In the early service ( less than 25 .6 million times of standard axle loads) , the modulus of the semi-rigid base decays slowly and when the pavement is loaded with 100 million cumulative equivalent standard axle loads , its modulus decays about 55%.