玄武岩纤维与高模量外掺剂复合增强沥青混合料性能

为优化玄武岩纤维高模量沥青混合料的配比，改善其路用性能，采用响应曲面法对玄武岩纤维高模量沥青混合料的配合比进行优化设计，利用马歇尔试验、浸水汉堡车辙试验、低温小梁弯曲试验、浸水马歇尔试验、冻融劈裂试验对优化后的玄武岩纤维高模量沥青混合料性能进行分析，并通过扫描电镜（SEM）对沥青混合料破坏断面的微观形貌进行试验观测，尝试揭示玄武岩纤维与高模量外掺剂的复合增强机理。研究表明：利用响应曲面法得到玄武岩纤维高模量沥青混合料的最佳配比为0.44%高模量剂、0.45%玄武岩纤维和最佳油石比为4.98%；在最佳配比状态下进行路用性能试验得知混合料的高温稳定性、低温抗裂性、水稳定性均有较大提升；利用扫描电镜观察到玄武岩纤维在高模量剂作用下能起到较好的加筋及分散应力的作用，且最佳配合比状态下的玄武岩纤维在高模量沥青混合料中分布较为均匀。

Research on Performance of Asphalt Mixture Reinforced by Basalt Fiber and High Modulus Admixture

In order to optimize the ratio of basalt fiber high modulus asphalt mixture and improve its road performance, the response surface method was used to optimize the mix ratio of basalt fiber high modulus asphalt mixture, the performance of optimized basalt fiber high modulus asphalt mixture was analyzed by Marshall test, immersion Hamburg rutting test, low temperature trabecular bending test, immersion Marshall test and freeze-thaw splitting test, the microstructure of the asphalt mixture failure section was observed by scanning electron microscopy ( SEM ), and the composite enhancement mechanism of basalt fiber and high modulus admixture was tried to reveal. The results show that the optimum ratio of basalt fiber high modulus asphalt mixture obtained by response surface method is 0.44% high modulus agent, 0.45% basalt fiber and 4.98% optimum asphalt aggregate ratio; the road performance test under the best mix shows that the high-temperature stability, low temperature crack resistance, and water stability of the mixture have been greatly improved; it is observed by scanning electron microscopy that the basalt fiber can play a better role in reinforcing and dispersing stress under the action of high modulus agent, and the basalt fiber in the best mix is more evenly distributed in the high modulus asphalt mixture.