关键词: 再生骨料水工沥青混凝土, 拉伸力学性能, 破坏模式, 动态增强因子

Abstract: To improve the efficiency of recycled aggregate utilization and its engineering benefit, this paper discusses its application to hydraulic asphalt concrete. We conduct an experiment on the tensile properties of recycled aggregate asphalt concrete at different temperatures (-10 - 10 ℃) and strain rates (10-5 - 10-2 s-1), considering possible structural cracking damage to an impervious body of such concrete in the working environment. The results show that temperature dropping or strain rate increasing of a test sample results in an increase in its tensile strength and tensile modulus and the proportion of aggregate fractures at its failure section, but a decrease in its peak strain. Based on the test results, we investigate the influence of strain rate on its tensile mechanical parameters which follows a trend that can be quantitatively described using a logarithmic dynamic enhancement factor. The tensile properties are compared in this paper with those of the corresponding natural aggregate concrete under the same working conditions, and the similarities and differences between the two are examined. We also find that the tensile properties of recycled aggregate hydraulic asphalt concrete are considerably lower than those of natural aggregate hydraulic asphalt concrete to a certain extent, but its properties still meet the design requirements of the specifications.

Key words: recycled aggregate hydraulic asphalt concrete, tensile mechanical property, failure mode, dynamic enhancement factor