氯盐对纤维沥青混凝土马歇尔试验影响

Influence of Chlorine Salt on Marshall Test of Fiber Reinforced Asphalt Concrete

融雪剂的大量使用使沥青路面过早的出现损坏,因此以AC-13型纤维沥青混凝土为研究对象,采用马歇尔试验研究其在清水和饱和氯化钠溶液中马歇尔试验指标的变化规律;并对木质素纤维、玄武岩纤维和聚酯纤维的改善效果进行研究。试验结果表明,在清水和饱和氯化钠溶液中,加入纤维后沥青混凝土的马歇尔稳定度增大,流值也增大;玄武岩纤维对沥青混凝土的增强增韧效果优于木质素纤维和聚酯纤维。饱和氯化钠溶液中沥青混凝土的马歇尔稳定度和流值均明显低于清水中,说明盐分的存在加剧了沥青混凝土的破坏,而掺加纤维能够明显提高沥青混凝土抵抗盐分侵蚀的能力。

The premature damage of asphalt pavement appears with using a lot of deicing salt. The experiment analyzes the change law of Marshall indexes under the condition of water and saturated NaCl solution, by Marshall test of fiber asphalt concrete of AC-13. And improvement effect is studied of lignin fiber, basalt fiber and polyester fiber. The test results indicate that Marshall stability and flow value of asphalt concrete increase adding fiber in wa- ter and saturated NaCl solution. Basalt fiber has better effect of both reinforcing and toughening than lignin fiber and polyester fiber. Marshall stability and flow value of asphalt concrete in saturated NaCl solution are lower than that in water, which shows that chlorine salt can accelerate the failure of asphalt concrete. Adding fiber can im- prove the ability of resistance salt erosion of asphalt concrete.