【摘要】 为探讨海洋环境对沥青混凝土水稳定性的影响,首先对比分析了沥青混凝土在淡水和海水两种介质中浸泡不同时间后,其冻融劈裂性能的变化情况,通过选用玄武石集料、SBS改性沥青,掺加水泥和抗剥落剂等改善措施,探究提升沥青混凝土抵抗海洋环境的能力,并进一步结合氯离子渗透实验及细观形貌测试,分析海水侵蚀沥青混合料性能的机理。结果表明,沥青混凝土经海水浸泡后,其冻融劈裂抗拉强度随浸泡时间增长而降低,使用SBS改性沥青及抗剥落剂能显著提高沥青混凝土的抗海水损害能力。海水的盐分很难扩散到沥青混凝土内部,随着水分蒸发,盐分主要集聚在沥青混凝土表面开口空隙中,产生结晶,进而加速混合料的破坏。更多还原

【Abstract】 To discuss the marine environment affect the water stability of asphalt concrete,the article analyzed the changes of the freeze-thaw splitting performance of asphalt concrete after soaking by freshwater and seawater for different time,and take improvement measures by choosing basalt,SBS modified asphalt,mixed cement and anti-stripping to explore how to promote the ability of asphalt concrete resist the marine environment. And the mechanism of seawater erosion asphalt mixture performance was analyzed by combining with the chlorideion penetration experiment and mesoscopic morphology test,The results show that after seawater immersion,the freeze-thaw splitting tensile strength of asphalt concrete declined with the increase of soaking time,using SBS modified asphalt and antistripping agent can significantly improve the ability of resistance to seawater damage of asphalt concrete. The salinity of seawater is hard to spread into the asphalt concrete,with evaporation of water,the salinity mainly concentration in the surface gap of asphalt concrete,produce salt crystal,then speed up the destruction of the mixture.更多还原