添加剂对含盐高湿环境沥青混合料水稳定性的影响

摘要

采用玄武岩纤维、聚酯纤维、木质素纤维、抗剥落剂 AMR、TJ-066和消石灰六种添加剂生产沥青混合料并成型试件，将试件在10％ NaCl 溶液中干湿循环15次以模拟含盐高湿环境的侵蚀作用，然后进行浸水马歇尔实验、冻融劈裂实验、动水压力冲刷劈裂实验和浸水汉堡车辙实验。实验结果表明，掺加6种添加剂后，沥青混合料的残留稳定度、冻融劈裂强度比和冲刷劈裂强度比均有不同程度的提高；不同添加剂均可以提高沥青混合料的破坏次数，延缓剥落现象的出现并降低剥落速率，减小混合料破坏时的车辙深度；玄武岩纤维改善沥青混合料水稳定性的效果最好，消石灰次之，两种抗剥落剂相对较差，建议在含盐高湿地区优先选择玄武岩纤维来提高沥青混合料的抗水损害性能。%The basalt fiber,polyester fiber,lignin fiber,AMR,TJ-066 and hydrated lime were selected to pro-duce asphalt mixtures and the specimens were shaped.Dry-wet cycles of specimens in 10% NaCl solution were carried out to speed up the erosion of salty and humid environment,and then the Immersion Marshall Test, freeze-thaw splitting test,dynamic water scouring and splitting test and Hamburg wheel tracking test in water were carried out.The test results show that the residual stability,freeze-thaw splitting strength ratio and scou-ring and splitting strength ratio of asphalt mixture all increase at certain degrees after mixed six kings of addi-tives.Different additives can increase the failure number,delay the appearance of spalling phenomenon and re-duce the spalling rate of asphalt mixture.The effect of basalt fiber in improving the water stability of asphalt mixture is best,followed by hydrated lime,and the effect of two anti-stripping agents is relatively poor.The basalt fiber is recommended to improve the water damage resistance of asphalt mixture in salty and humid area.