玄武岩纤维增韧环氧沥青及其混合料性能研究  

Research on the Performance of Basalt Fiber Toughened Epoxy Asphalt and Mixture

作　　者：李靖 曹海波[2] 任海生 LI Jing;CAoHai-bo;RENHai-sheng(Qinghai Urban Transportation Planning and Design Institute Co.Ltd.,Xining 810000,China;CCCC First Highway Consultants Co.Ltd.,Xi'an 710075,China;Southeast University,Nanjing 210096,China)

机构地区：[1]青海省交通规划设计研究院有限公司,西宁市810000 [2]中交第一公路勘察设计研究院有限公司,西安市710075 [3]东南大学,南京市210096

出　　处：《公路》2024年第9期285-290,共6页Highway

基　　金：国家自然科学基金会项目,项目编号52178419;国家重点研发项目,项目编号2021YFB2601200;中交一公院科技创新基金项目,项目编号KCJ2022-19。

摘　　要：通过对环氧沥青及玄武岩纤维性能的分析,采用玄武岩纤维对环氧沥青及其混合料进行增韧改性以期改善环氧沥青混合料的低温性能和抗疲劳性能;通过扫描电镜对玄武岩纤维与环氧沥青的混合胶浆进行观察,发现玄武岩纤维与环氧沥青之间存在着较好的黏附作用,玄武岩纤维在环氧沥青内部可形成空间三维网状结构,能有效传递分散应力,起到加筋增韧作用;通过掺入不同用量的玄武岩纤维制备了增韧环氧沥青,采用直接拉伸试验和BBR试验评价了增韧环氧沥青的性能。结果表明:玄武岩纤维增韧环氧沥青具有充足的容留时间,随着玄武岩纤维掺量的增加,增韧环氧沥青的拉伸性能和低温性能得到不断增强,纤维掺入量达到4%之前增强速率较为明显,而纤维掺入量超过4%后,性能的增强速率减缓。制备玄武岩纤维增韧环氧沥青混合料,并对其低温性能和抗疲劳性能进行分析,研究发现:随着玄武岩纤维的掺量增多,环氧沥青混合料的低温性能总体呈增大趋势,当玄武岩纤维掺量为0.4%时,环氧沥青混合料的最大弯拉应变提高了18.9%,抗弯拉强度提高22.5%,玄武岩纤维能够有效地增强环氧沥青混合料在低温下的承受荷载能力和抗变形能力,在重载作用下,玄武岩纤维增韧环氧沥青混合料的抗疲劳性能优于普通环氧沥青混合料。Through the analysis of the properties of epoxy asphalt and basalt fiber,basalt fiber is used to toughen epoxy asphalt and its mixture in order to improve the low temperature performance and fatigue resistance of epoxy asphalt mixture.The mixed mortar of basalt fiber and epoxy asphalt is observed by scanning electron microscopy.It is found that there is a good adhesion between basalt fiber and epoxy asphalt.Basalt fiber can form a three-dimensional network structure inside epoxy asphalt,which can effectively transfer dispersed stress and play a role in reinforcing and toughening.Toughened epoxy asphalt is prepared by adding different amounts of basalt fiber.The properties of toughened epoxy asphalt are evaluated by direct tensile test and BBR test.The results show that basalt fiber toughened epoxy asphalt has sufficient retention time.With the increase of basalt fiber content,the tensile properties and low temperature properties of toughened epoxy asphalt are continuously enhanced.The enhancement rate is obvious before the fiber content reaches to 4%,and the enhancement rate of performance slows down after the fiber content exceeds 4%.The basalt fiber toughened epoxy asphalt mixture is prepared and its low temperature performance and fatigue resistance are analyzed.It is found that with the increase of basalt fiber content,the low temperature performance of epoxy asphalt mixture generally shows an increasing trend.When the basalt fiber content is 0.4%,the maximum flexural tensile strain of epoxy asphalt mixture increases by 18.9%,and the flexural tensile strength increases by 22.5%.Basalt fiber can effectively enhance the load bearing capacity and deformation resistance of epoxy asphalt mixture at low temperature.Under the action of heavy load,the fatigue resistance of basalt fiber toughened epoxy asphalt mixture is better than that of ordinary epoxy asphalt mixture.

关 键 词：沥青混合料 玄武岩纤维 环氧沥青 增韧改性 疲劳性能 低温性能 

分 类 号：U414.75[交通运输工程—道路与铁道工程]