Analysis of Aging Resistance of Waste Polyethylene Plastic Modified Asphalt Mixture
[Purposes]This paper aims to analyze the aging resistance of waste polyethylene modified as-phalt mixture.[Methods]The performance of different types of asphalt mixtures before and after aging was evaluated by rutting test,uniaxial penetration test,low temperature bending test,freeze-thaw split-ting test and four-point bending fatigue test.[Findings]The test results show that the dynamic stability and penetration strength of PE and SBS modified asphalt mixture increase by 12%～18%and 25%～35%respectively after short-term and long-term aging,and the water stability and low temperature perfor-mance meet the requirements of the specification.The dynamic stability and penetration strength of ordi-nary asphalt mixture increase by 30%～35%and 60%～70%respectively.Only the water stability and low temperature performance after short-term aging can meet the requirements.[Conclusions]The aging re-sistance of PE and SBS modified asphalt mixture is basically the same,and significantly higher than that of ordinary asphalt mixture.PE modifier can inhibit or reduce the production of free radicals,and can sig-nificantly slow down the degree of oxidative aging of modified asphalt.
万方数据
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