Abstract: Combining with the photomicrographs of epoxy-asphalt concrete and fluorescence photomicrographs of the section of epoxy-asphalt concrete, the mechanical strength, water absorption, pH value and DMA analysis of epoxy-asphalt was used before and after freeze-thaw cycles, to investigate the damage mechanism of mechanical properties of epoxy asphalt under freeze-thaw cycles. The results show that: the causes of the damage of epoxy-asphalt concrete under freeze-thaw cycles were that the dispersion of epoxy-asphalt-aggregates was destroyed in the physical aspects and the curing structural of epoxy were bracken in the chemistry aspects. At the initial stage of freeze-thaw cycles, the water molecules into the epoxy asphalt system cause epoxy hydrolyzed, which destroys the molecular structure of the cross-linked epoxy resin curing; at the late stage of freeze-thaw cycles, asphalt gradually separates out of the curing system, which causes the curing system structure damaged, the tensile strength of the system reduced by about 32.42 % from 5.12 MPa to 3.51 MPa, and the adhesive strength reduced by 3.25 % from 47.87 MPa to 46.31 MPa.

Key words: road engineering, epoxy-asphalt, water damage, damage mechanism, freeze-thaw cycles, mechanical property

摘要： 利用冻融循环前后环氧沥青力学强度、吸水率、pH值以及DMA分析，并结合环氧沥青混凝土剥离断面的显微照片、环氧沥青的荧光显微照片，研究了环氧沥青混凝土在冻融循环实验条件 下的水损坏机理。研究表明：环氧沥青混凝土在冻融循环条件下的水损破坏主要表现为，物理方面沥青相与环氧树脂以及集料分散情况的破坏，化学方面环氧树脂固化结构的破坏，即在冻融 循环初期，水分子进入环氧沥青体系中造成环氧树脂发生水解，破坏环氧树脂的交联固化的分子结构；冻融循环后期，水分子使沥青相从环氧树脂固化系中逐渐析出，沥青逐渐析出固化体系 ，导致体系的分散结构，造成体系拉伸强度从5.12 MPa降低到3.46 MPa，降幅约32.42 %，黏结强度从47.87 MPa降低到46.31 MPa，降幅为3.25 %。

关键词: 道路工程, 环氧沥青, 水损坏, 破坏机理, 冻融循环, 力学性能