Performance study of compound waterborne epoxy micro-surfacing
In order to improve the performance of micro-surfacing,the mixed waterborne epoxy modified emulsified asphalt was prepared by mixing water-based epoxy resin(WER)with styrene butadiene(SBR)latex.Through pull-out test,torsional shear test and accelerated loading wear test,the durability and bonding properties of water-based epoxy resin micro-surfacing with original pavement layer were studied,and compared with SBR emulsified asphalt micro-surfacing.The results showed that the adhesion between the surface and the original pavement was improved by the addition of waterborne epoxy resin.At 25℃and 60 ℃,the pull-out strength and torsional shear strength of the mixed waterborne epoxy modified asphalt adhesive layer oil were 14.2％,77.8％,27.12％and 60.87％higher than that of SBR emulsified asphalt adhesive layer oil,respectively.The optimal distribution amounts of the two kinds of adhesive layer oil were 0.6 kg/m2 and 0.4 kg/m2,respectively.There was a good positive correlation between pull-out strength and torsional shear strength.The skip resistance and wear resistance of the micro-surface were improved with the increase of the content of waterborne epoxy resin,but when the content exceded 10wt％,the performance improvement was not obvious,and the optimal content of waterborne epoxy resin was recommended to be 10wt％.
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