论文部分内容阅读
采用浓度为10%的亚硫酸盐饱和溶液(质量比为1∶2的Na_2SO_4与NaCl)模拟本地盐渍环境,采用真空饱水法加速其劣化作用。首先通过马歇尔试验和车辙试验确定再生混合料中最佳玄武岩纤维的掺量及新沥青掺量;其次,通过浸水马歇尔试验和多次冻融循环劈裂试验研究其耐久性能。试验结果表明:经过短期浸泡后,处于高浓度盐腐蚀环境中的再生混合料的浸水残留稳定度略高于水环境的;随着冻融循环次数的增加,高浓度饱和盐腐蚀环境加速劣化混合料的性能,在经过7次冻融循环后,置于水环境中的混合料试件的TSR满足规范要求,而置于高浓度盐腐蚀环境中的混合料设计已不满足规范要求。
A saturated solution of sulfite (Na_2SO_4 and NaCl at a mass ratio of 1: 2) was used to simulate the local salinity environment at a concentration of 10%. The vacuum saturated method was used to accelerate the degradation. Firstly, the optimal basalt fiber content and new asphalt content in recycled mixture were determined by Marshall test and rutting test. Secondly, the durability performance was studied by immersion Marshall test and repeated freeze-thaw cycles. The results showed that after immersed for a short period of time, the residual stability of the soaking mixture was slightly higher than that of the water environment when the salt mixture was exposed to high concentrations of salt. With the increase of freeze-thaw cycles, After 7 freeze-thaw cycles, the TSR of the mixture specimens placed in the water environment met the specifications, whereas the design of the mixture placed in the high salt concentration environment did not meet the specifications.