废胶粉与废塑料复合改性沥青混合料性能研究

Performance study of waste tire rubber and waste plastic composite modified asphalt

为研究废胶粉(WTR)与废塑料(EVA)复合改性沥青混合料的性能和最佳掺量,分别采用废胶粉掺量为5%、10%、15%与废塑料掺量为0%、4%、6%复配,制备5种复合改性沥青AC−13C混合料进行马歇尔试验、车辙试验、低温劈裂试验,研究改性沥青混合料的高低温性能。试验结果表明:废胶粉与废塑料均能有效改善基质沥青的高温性能,其中掺量为15%WTR+4%EVA复合改性沥青的改善效果最明显,其混合料具有最高动稳定度、最低流值、最佳高温性能。掺入废胶粉和废塑料,能有效改善沥青混合料的低温性能,15%WTR+6%EVA改性沥青混合料的低温劈裂强度为最大,较基质沥青提升了34.8%;15%WTR+4%EVA改性沥青混合料的低温劈裂强度稍低,较基质沥青提升了22.8%。综合改性沥青的高低温性能,15%WTR+4%EVA为复合改性沥青的最佳掺量。

In order to study the performance of waste tire rubber(WTR)and waste plastic ethylene vinyl acetate(EVA)composite modified asphalt mixture,five kinds of composite modifier contents(5%WTR+4%EVA,10%WTR+4%EVA,15%WTR+4%EVA,15%WTR+0%EVA,15%WTR+6%EVA)were used to prepare AC-13C asphalt mixture.And the Marshall test,rutting test and low temperature splitting test were conducted to study the high and low temperature performance of the composite modified asphalt mixture.The results showed that,the high temperature properties of base asphalt can be improved by mixing WTR and EVA.Especially,the asphalt was mixed with 15%WTR and 4%EVA,the high temperature performance was significantly improved.And the 15%WTR+4%EVA modified asphalt mixture had the maximum dynamic stability and the minimum flow value,which indicated the optimum high temperature performance.Compared with base asphalt mixture,the low temperature splitting strength of 15%WTR+4%EVA and 15%WTR+6%EVA modified asphalt mixture were increased by 22.8%and 34.8%respectively.The comprehensive optimal modified content is 15%WTR+4%EVA.