Experimental Study on Water Stability of Permeable Asphalt Mixture Modified by Different Fibers
By adding basalt fiber and polyester fiber with different content into permeable asphalt mixture for modification,indoor freeze-thaw splitting test,immersion Marshall test and immersion dispersion test are used to systematically investigate the influence of fiber type and content on water stability of permeable asphalt mixture.The results show that:With the increase of BF and PF fiber content,the splitting strength,stability The freeze-thaw splitting strength ratio and the immersion residual stability increased first and then decreased,while the immersion dispersion loss decreased first and then increased;The proper amount of BF and PF fibers can play a good role in reinforcement and dispersion,which is conducive to the stability of the spatial structure of asphalt mixture.Therefore,it can improve the water stability of permeable asphalt mixture.The optimal amount of BF fiber and PF fiber is 0.4% and 0.2% respectively;BF fiber can significantly improve the freeze-thaw splitting strength ratio of permeable asphalt mixture,while PF fiber can significantly improve the immersion residual stability and immersion dispersion loss of permeable asphalt mixture.Therefore,BF fiber is suitable for the northern seasonal frozen areas,while PF fiber is more suitable for the southern rainy areas.
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