Abstract
An innovative approach for characterizing the fatigue character of high modulus asphalt concrete (HMAC) and matrix asphalt concrete was presented. Strain-life fatigue equations based on uniaxial tensile test are employed to extract parameters characteristic of the asphalt concrete's resistance to fatigue. The feasible test conditions including specimen size, failure criterion, control mode, loading frequency and test temperature are proposed. In addition, the effect of the mean stress on the fatigue life is analyzed that mean stress has minor influence on fatigue life evaluation. Fatigue strain threshold, limit strain and fatigue life equation are put forward based on the fatigue test results at different strain levels. Such fatigue equation as well as tensile strain threshold and limit value can guide the development of the two asphalt mixtures, which can estimate the lifetime of load-bearing structures. From the fatigue character comparison between the two asphalt mixtures, tensile strain threshold and limit tensile strain of HMAC are smaller than those of matrix asphalt concrete, and HMAC can better resist the fatigue damage than matrix asphalt concrete.
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