柔性聚丙烯纤维-改性乳化沥青混合料的性能

Experimental Research on Performance of Flexible Polypropylene-fiber & Modified Emulsion-asphalt Mixture

基于"工程地圈系统",首先分析影响路面结构性能的因素,然后以湿轮磨耗值和负荷轮粘砂量为评价指标,通过室内试验给出纤维沥青混合料的试验配合比,并分析纤维长度对混合料性能的影响;测试纤维沥青混合料的抗剪切、抗裂、抗疲劳等性能,对纤维增强沥青混合料性能的机理进行解释。结果表明:聚丙烯纤维-改性乳化沥青混合料试验配合比为纤维∶沥青∶石料∶水=0.25∶11.5∶100∶9.0,施工配合比建议为0.25∶11.5∶100∶11.5。当纤维长度大于两倍石料最大粒径时,对混合料性能的提高并不明显;温度越高则纤维沥青混合料的质量损失越小,并最终趋于稳定。纤维沥青混合料和沥青混合料对应的临界抗飞散温度分别是25和40℃;纤维的加入,使得混合料抗剪、抗裂、抗疲劳等性能均有所提高。

Influencing factors to pavement performance were analyzed firstly based on the 'Engineering Geo-sphere System'. Then the experimental mixing ratio of fiber-asphalt mixture was obtained and the fiber dimension effect on performance was analyzed according to soak abrasion and loading wheel. Finally, the physico-mechanical parameters were tested, and the qualitative explaination for the fiber-reinforced mechanism was given. The results show: The experimental mixing ratio is 0.25∶11.5∶100∶9.0 for fiber, modified emulsion-asphalt, gravel and water, and 0.25∶11.5∶100∶11.5 is recommended for the construction. When the fiber length is two times beyond the maximum gravel diameter, the reinforced performance is unobvious;Mass loss of mixture decreases with the increasing temperature, and becomes stable finally. The critical temperatures for these two mixtures are 25℃ and 40℃ respectively;The mixture performance improves due to the introduction of fiber.