Correlation between pavement temperature and deflection basin form factors of asphalt pavement

摘要

In this study, the effect produced by pavement temperature change on asphalt pavement deflection basin form factor was studied. To determine the correlation between temperature and deflection basin factors of asphalt pavement, deflection tests were carried out on three roads with various thicknesses at different temperatures in one-year cycle. The air temperature and pavement temperature at different depths of the pavement were also measured during falling weight deflectometer testing. First, based on the experimental results and also by taking into account the difference between heating and cooling cycles of the air, a temperature model of asphalt pavement was developed to determine the pavement temperature. Then the relationship between the maximum deflection value and pavement temperature as well as the temperature correction relations was established through regression analysis. Finally, the relationship between the other deflection basin form factors and the pavement temperature was analysed. The results demonstrate that the pavement temperature prediction model is simple yet highly accurate, indicating the inherent correlation between the deflection basin correction factors and pavement temperature. The temperature correction relations of deflection basin factors built in this study are accurate and reasonable, which would be helpful for quality testing and modulus back-calculation of asphalt pavement.