湿热环境下海盐侵蚀对沥青集料界面体系的损伤效应分析

In order to study the damage effect of the sea salt - moisture - heat coupling effect on the asphalt - aggregate interface system, the influences of the type and concentration of salt solution and the immersion time on the tensile strength, asphalt film spalling rate, self-healing ability and water stability after self-healing of the asphalt - aggregate interface system were analyzed, and the damage mechanism of the asphalt - aggregate interface system in the salt - moisture - heat environment was discussed. The results show that the asphalt - aggregate specimen with an asphalt film thickness of 6μm has the largest tensile strength and can be used as a standard specimen for subsequent simulation tests; with the extension of the salt erosion time, the tensile strength of the asphalt - aggregate specimen gradually decreases, and the asphalt film spalling rate gradually increases, and the rate of change is larger in the early stage and then gradually tends to be stable; drying at 60°C can effectively restore the interface strength of the asphalt - aggregate, but due to the erosion of the aggregate surface by the solution, the water stability after self-healing is significantly reduced, and the stronger the corrosiveness of the sea salt solution, the worse the water stability; the larger the comprehensive spalling work of the solution, the higher the tensile strength of the asphalt - aggregate specimen and the lower the asphalt film spalling rate, indicating that both the corrosion characteristics and surface tension characteristics of the sea salt solution will affect its damage effect.

为研究海盐-湿-热耦合作用对沥青-集料界面体系的损伤效应,分析了盐溶液类型、浓度、浸泡时间对沥青-集料界面体系抗拉强度、沥青膜剥落率、自愈能力以及自愈后水稳定性的影响,探讨了盐-湿-热环境下沥青-集料界面体系的损伤机理.结果表明:沥青膜厚度为6μm的沥青-集料试样抗拉强度最大,可作为后续模拟试验的标准试样;随着盐侵蚀时间的延长,沥青-集料试样抗拉强度逐渐减小,沥青膜剥落率逐渐上升,并且在前期变化速率较大,之后逐渐趋于稳定;60℃高温烘干能够有效地恢复沥青-集料的界面强度,但因集料表面受到溶液的侵蚀,自愈之后的水稳定性明显下降,海盐溶液的腐蚀性越强,水稳定性越差;溶液的综合剥落功越大,沥青-集料试样抗拉强度越高,沥青膜剥落率越低,说明海盐溶液的腐蚀特征和表面张力特征均会影响其损伤效应.