玄武岩纤维增强沥青混凝土试验与性能研究

Experimental Research on Performance of Basalt Fiber Reinforced Asphalt Concrete

为研究玄武岩纤维对沥青混凝土性能的影响,在采用车辙试验和低温弯曲试验优选纤维类型和掺加量的基础上,通过劈裂试验、冻融劈裂试验、浸水马歇尔试验、车辙试验、60℃动态蠕变试验以及-10℃低温弯曲试验,将无纤维添加剂、掺加聚酯纤维、木质素纤维与玄武岩纤维的沥青混凝土性能进行对比研究。结果表明:掺加0.25%、经膨化及特定浸润剂处理的长径比为13μm/4.5mm的玄武岩纤维对沥青混凝土具有最好的增强效果;玄武岩纤维可以改善沥青混凝土的各项路用性能,尤其在高温稳定性和低温抗裂性方面效果显著,提高幅度均能达到80%。

Abstract： To study the impact of basalt fibers on the performance of asphalt concrete, the performance of asphalt concrete without the fibers and with polyester fiber, lignin fiber and basalt fiber were compared by splitting test, freeze-thaw splitting test, immersion marshall test, rutting test, 60℃ dynamic creep test and-lO℃ bending test, on the basis of optimum selecting the fiber type and dosage. The test data supported that the basaltfiber, which was expanded, specific infiltrating, with a longth and radius ration of 13μm /4.5 mm and the content of 0.25%, gave the optimum enhancing effect. The results showed that the basalt fiber could enhance all the pavement performances of asphalt concrete, especially, in high-temperature stability and low-temperature anti-cracking, increased by 80%.