NING Zhiyuan, LIU Yunhe, WANG Weibiao, ZHANG Kai

Abstract: In order to study the compressive properties of hydraulic asphalt concrete under different temperatures and the impermeability after loading, the axial compressive test was carried out at -30℃~30℃, and the permeation test was conducted on the specimens subjected to the combined action of temperature and loading. The test results show that the temperature has significant influence on the stress-strain curve, compressive strength, elastic modulus, critical strain and failure modes. By comparing the stress-strain curve characteristics of hydraulic asphalt concrete at -30℃~30℃, it can be inferred that -10℃~0℃ is the critical transition temperature range. Compressive strength and elastic modulus decrease with the increase of temperature, while the critical strain increases. Based on the test results, the empirical formulas proposed in this paper better reflect the variation trends of compressive strength, elastic modulus and critical strain varying with the temperature. In addition, the failure at a temperature range of -30℃~0℃ is mainly in binder failure and trans-aggregate failure modes, whereas that at a range of 10℃~30℃ is mainly in binder failure mode. Moreover, the impermeability of hydraulic asphalt concrete after the loading is related to the temperature ambient. When the specimens are subjected to 7% axial compressive strain at a temperature range of 10℃~30℃,its permeability coefficient is still in the order of 10-7 cm/s~10-6 cm/s, showing its good impermeability.

Keywords: hydraulic asphalt concrete; mechanical properties; temperature effect; impermeability; failure modes