泡沫沥青再生混合料劈裂强度影响因素试验

为了研究不同泡沫沥青用量和旧沥青路面铣刨料(简称RAP)掺量两因素对泡沫沥青再生混合料劈裂强度的影响,采用两种不同的沥青路面铣刨旧料RAP1和RAP2,通过变化旧料掺量为0%、20%、40%、60%、80%5种比例,分别与2%、2.5%、3%、3.5%、4%5种用量的泡沫沥青混和,拌制泡沫沥青再生混合料,成型试件后进行干、湿两种条件下的劈裂强度(ITS)和残留劈裂强度比(TSR)测试.结果表明:在沥青旧料掺量比例一定的情况下,混合料的泡沫沥青用量存在最佳值;随着RAP掺量逐渐增大,泡沫沥青再生混合料的最佳沥青用量却逐渐减小,其值由RAP掺量为0时的3.5%减少到掺量为80%时的2%;随着RAP掺量的增大,泡沫沥青再生混合料干、湿ITS呈现减小趋势,但TSR却有所提高.

Test on Influence Factor of Splitting Strength for Foamed Asphalt Recycled Mix

In order to study the influence of different foam asphalt content and content of milling material from asphalt pavement(RAP) on splitting strength of the foam asphalt recycled mix,two different milling materials from asphalt pavement which will be called RAP1 and RAP2 were chosen.The old material volume which is respectively 0%,20%,40%,60%,80% and the foam asphalt content which is 2%,2.5%,3%,3.5%,4% were mixed,and mixed foamed asphalt recycled mix,molded piece,determined dry and wet splitting strength(ITS) and residual splitting strength ratio(TSR).The results showed when old material content proportion was a certain condition,the foam asphalt content of mixture reached an optimum value.As the RAP content increased gradually,optimum asphalt content of foamed asphalt recycled mix was reduced gradually,and the value changed from 3.5% when RAP was 0 to 2% when RAP was 80%.As the RAP content increased,dry and wet ITS of foamed asphalt recycled mix decreased,but TSR increased.