Research on the Performance of Basalt Fiber Toughened Epoxy Asphalt and Mixture
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.
asphalt mixturebasalt fiberepoxy asphalttoughening modificationfatigue performancelow temperature performance
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