基于响应曲面法的玄武岩纤维沥青混合料设计及路用性能研究

Basalt fiber asphalt mixture design and road performance research based on response surface methodology

为提高玄武岩纤维对沥青混合料的改善效果,采用响应曲面法设计试验进行研究,得到玄武岩纤维改性沥青混合料的最佳掺配方式。参照优化方案制备纤维沥青混合料,通过车辙试验、低温弯曲试验、冻融劈裂试验和四点弯曲疲劳试验进行相关路用性能分析。试验结果表明,玄武岩纤维长度和掺量的最佳优化方案是纤维长度为6 mm,纤维掺量为6%。玄武岩纤维的掺入可以提高沥青混合料的高温性能和抗水损坏能力,最佳掺量下混合料动稳定度和冻融劈裂强度比分别是基质沥青混合料的252.4%和113.1%。同时纤维可提升沥青混合料低温性能,延长沥青混合料的疲劳寿命,但纤维长度和掺量过大时,反而会削弱对沥青混合料高低温性能和水稳定性的改善效果。

In order to improve the improvement effect of basalt fiber on asphalt mixture,response surface methodology is used to design and study,and the best blending method of basalt fiber modified asphalt mixture is obtained.The fiber asphalt mixture is prepared according to the optimized scheme,and the road performance is analyzed through rutting test,low-temperature bending test,freeze-thaw splitting test and four-point bending fatigue test.The test results show that the best optimization scheme of basalt fiber length and content is fiber length of 6 mm and the fiber content of 6%.The incorporation of basalt fiber can optimize the performance under high temperature conditions and water damage resistance of asphalt mixture.The dynamic stability and freeze-thaw splitting strength ratio of the mixture with best fiber content are 252.4%and 113.1%of those of the base asphalt mixture,respectively.At the same time,fiber can improve the low temperature performance and prolong the fatigue life of asphalt mixture,but when the fiber length and content are too large,the improvement effect on the high and low temperature performance and water stability will be weaken.