细粒式纤维沥青混合料配合比设计与性能试验分析

摘要

In order to analyze the effects of fibers on the reinforced action of asphalt mixtures, the two kinds of representative fibers (polyester fiber and basalt fiber) and the three kinds of common fine-grained gradations of surface layer(AC-13C, SMA-13 and OGFC-13) were selected for design and laboratory performance tests of asphalt mixtures. The results show that the basalt fibers have stronger effects of bridge, reinforcement and adsorption than the polyester fibers. The incorporation of fibers can effectively improve physical and mechanical properties and pavement performances. The reinforced effect of fibers to the asphalt mixtures of dense gradation is superior to that of open gradation,and the reinforced action of basalt fibers is generally better than that of the polyester fibers. So suitable fiber contents of fine-grained fiber-reinforced asphalt mixture were determined:0. 2%～0. 3% of polyester fibers and 0. 3%～0. 4% of basalt fibers. The results can be as references for the engineering applications.%为了分析纤维对沥青混合料的增强作用,选取2种代表纤维(聚酯纤维和玄武岩纤维)及3种常用表面层细粒式级配(AC-13C,SMA-13和OGFC-13),进行了大量沥青混合料配合比设计和室内性能试验.试验结果表明:玄武岩纤维比聚酯纤维具有更强的桥接、加筋和吸附作用；纤维的掺入可有效改善沥青混合料的各项物理和力学性能及路用性能,且对密实级配沥青混合料的增强效果优于开级配沥青混合料的,而玄武岩纤维的增强作用总体优于聚酯纤维的；由此确定细粒式纤维沥青混合料的适宜纤维掺量为:聚酯纤维0.2％～0.3％,玄武岩纤维0.3％～0.4％,可供工程应用参考.