聚乙烯蜡温拌再生沥青性能研究

Research on the performance of polyethylene waxwarm mix rejuvenated asphalt

聚乙烯蜡可提升沥青路用性能,同时具有良好的经济效益而受到研究人员的广泛关注。选取新聚乙烯蜡(NPEW)与回收聚乙烯蜡(RPEW)按照等比混掺的方式作为温拌剂(PEW),将PEW与再生剂(LBS)加入新旧共混沥青中制备了聚乙烯蜡温拌再生沥青,其中新旧共混沥青中分别含20%、30%、40%的老化SBS改性沥青(AAM),用于模拟实际路面再生过程中旧沥青比例。通过沥青三大指标、布氏黏度对不同PEW及AAM掺量下温拌再生沥青的感温性能、高低温性能及降黏效果进行分析。结果表明,AAM和PEW的添加可减少温拌再生沥青的温度敏感性;当温拌再生沥青中AAM掺量一定时,随着PEW掺量的增加,高温抗变形能力,低温抗裂性能均有显著提升;当温拌再生沥青中AAM掺量较低时,PEW的掺入可有效降低黏度;当AAM掺量30%,PEW掺量2%时,温拌再生沥青兼具最佳的路用性能及经济效益。

Waste plastic polyethylene wax has been widely studied by researchers for its ability to improve the performance of asphalt pavement and its good economic benefits.This article selected new polyethylene wax(NPEW)and recycled polyethylene wax(RPEW)as warm mix agents(PEW)in an equal ratio,and added PEW and rejuvenator(LBS)to the virgin and aged blending asphalt to prepare polyethylene wax warm mix rejuvenated asphalt.The virgin and aged blended asphalt contained 20%,30%,and 40%aged SBS-modified asphalt(AAM),respectively,to simulate the proportion of old asphalt in the actual road surface rejuvenation process.The temperature sensing performance,high and low temperature performance,and viscosity reduction effect of warm mix recycled asphalt with different PEW and AAM dosages were analyzed through the conventional test and Brookfield viscosity.The results show that the addition of AAM and PEW reduced the temperature sensitivity of warm mix rejuvenated asphalt.When the AAM content in warm mix rejuvenated asphalt was constant,with the increase of PEW content,the high-temperature deformation resistance and low-temperature crack resistance performance were significantly improved.When the content of AAM in warm mix rejuvenated asphalt was low,the addition of PEW effectively reduced viscosity.When the AAM content was 30%and the PEW content was 2%,warm mix rejuvenated asphalt had the best performance and economic benefits.