Researching on Fatigue Model of Asphalt Mixtures

Abstract

Firstly different fatigue testing methods of HMA were summarized, the scope of applicability of two kinds of control mode were analyzed, it is recommended that indirect tensile fatigue test with stress control mode to be used. Then effect of different testing factors were analyzed, the scope of the loading wave, stress ratio, frequency and temperature were selected. Three kinds of HMA specimens were compacted by gyratory compactor. Indirect tensile fatigue tests were carried by uniform test design method under different temperatures, frequencies and loadings, including three void ratios of asphalt mixes. Significance of the testing results was analyzed. The fatigue models were brought forward through multiple linear regression methods based on VFA, temperature, frequency, initial strain and initial modulus for general and heavy-duty loading. Comparative study of the fatigue models was made at home and abroad, it is shown that the fatigue models are comparable. They could be used for the fatigue prediction of asphalt mixtures.