玄武岩纤维增强AC-13C沥青混合料性能研究
2021-07-15陈昌宇
陈昌宇



摘 要:针对目前AC级配沥青混合料性能不足,采用掺加0.4%玄武岩纤维增强AC-13C沥青混合料性能,通过马歇尔试验方法,分别确定了未添加玄武岩纤维AC-13C的最佳油石比4.9%,添加0.4%玄武岩纤维AC-13C的最佳油石比为5.2%;采用车辙试验、低温弯曲梁试验、浸水马歇尔试验和冻融劈裂试验等,分析了添加玄武岩纤维对AC-13C沥青高温性能、低温抗裂性能和水稳定性的影响。结果表明:添加玄武岩纤维可有效提高AC-13C沥青混合料的抗车辙性能、弯拉应变、残留稳定度和残留强度比,说明玄武岩纤维的加筋、桥接、增韧等增强作用可显著提升AC-13C的路用性能,并提升其耐久性。
关键词:道路工程 玄武岩纤维 AC-13C沥青混合料 油石比 路用性能
中图分类号:U414 文献标识码:A文章编号:1672-3791(2021)03(c)-0116-05
Research on Performance of Basalt Fiber Reinforced
AC-13C Asphalt Mixture
CHEN Changyu
(Hunan Xiangping Road and Bridge Construction Co., Ltd., Changsha, Hunan Province, 410114 China)
Abstract: In view of the performance of AC-13C asphalt mixture is insufficient at present, the performance of AC-13C asphalt mixture is enhanced by adding 0.4% basalt fiber, and the optimal asphalt to stone ratio of 4.9% without adding basalt fiber and 5.2% with adding 0.4% basalt fiber AC-13C are determined by Marshall test method. The influence of basalt fiber on the high temperature performance, low temperature crack resistance and water stability of AC-13C asphalt was analyzed by rutting test, low temperature bending beam test, soaking Marshall test and freeze-thaw split test. The results show that the addition of basalt fiber can effectively improve the rutting resistance, bending strain, residual stability and residual strength ratio of AC-13C asphalt mixture, which indicates that the reinforcement, bridging and toughening of basalt fiber can significantly improve the road performance and durability of AC-13C asphalt mixture.
Key Words: Road engineering; Basalt fiber; AC-13C asphalt mixture; Asphalt-aggregate ratio; Road performance
密級配沥青混凝土混合料AC结构是目前使用最广泛的沥青路面结构,一般不掺加纤维,但AC结构的沥青路面车辙性能普遍较差,且经常产生水稳定性不足的情况,特别在湖南地区,高温重载相当严重,且常年雨水较多,提高混合料AC结构的路用性能相当重要。因此,通过研究掺玄武岩纤维AC结构沥青混合料的路用性能,改善悬浮—密实结构现有的不足,提升南方高温多雨地区沥青路面质量具有重要意义。
袁玉卿等人研究在不同玄武岩纤维掺量下的透水沥青混凝土的性能,认为PAC的最佳玄武岩纤维掺量为0.3%~0.4%。王子枫等人通过多种室内试验对掺加玄武岩纤维的PAC-13混合料性能进行研究,发现纤维的掺入提高了PAC-13混合料渗水的有效空隙率和渗水系数。……
