γ辐照对回收LDPE改性沥青蠕变恢复特性的影响  

Effect of Gamma-Irradiation on Creep and Recovery Properties of Recycled Low-density Polyethylene Modified Asphalt

作　　者：王文奇[1,2,3] 丁海波[1,3] 王泽[2] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]西华大学土木建筑与环境学院,四川成都610039 [3]道路工程四川省重点实验室,四川成都610031

出　　处：《公路交通科技》2016年第12期29-34,共6页Journal of Highway and Transportation Research and Development

基　　金：绿色建筑与节能省重点实验室开放课题项目(szjj2015-074);道路工程省重点实验室开放研究基金项目(15206569);四川省教育厅项目(16ZB0164)

摘　　要：为提高回收低密度聚乙烯(LDPE_R)改性沥青的性能,采用伽马射线(γ)辐照处置的回收低密度聚乙烯聚合物制备相应的改性沥青。通过表面形态、FTIR光谱研究了其中的化学改性机理,采用多应力蠕变恢复试验(MSCR)研究了γ-LDPE_R改性沥青高温蠕变恢复特性。结果表明,γ-LDPE_R对沥青的加劲效果增强了沥青的温度稳定性,且采用γ-LDPE_R聚合物改性具有更好的高温性能。当LDPE_R表面采用伽马射线辐照后形成自由基和一些官能团,使聚合物改性剂和沥青之间形成较强的化学键,从而提高了改性沥青的相容性。随着γ-LDPE_R用量增加,改性沥青高温稳定性增加,然而对于高掺量γ-LDPE_R的改性沥青,采用MSCR评价高温性能的适用性值得进一步研究。In order to improve the performance of recycled low-density polyethylene（LDPER）,the modified asphalt with gamma-irradiated recycled low-density polyethylene（γ-LDPER） is prepared. The chemical modification effect of γ-LDPER on asphalt is investigated by means of morphology and FTIR spectroscopy,and the high temperature creep-recovery property of γ-LDPERmodified asphalt is studied by multiple stress creep recovery test. The result shows that（1） the stiffening effect of γ-LDPERincreased the temperature stability of base asphalt and γ-LDPERmodified asphalt has better high temperature performance;（2） the surface of the LDPERwhich treated by gamma beam irradiation provided formation of free radicals and some functional groups that may contribute to the creation of strong chemical bonds between polymer modifier and asphalt and improved the compatibility of the modified asphalt. With the increased use of γ-LDPER,the high temperature stability of the modified asphalt increased,but for the modified asphalt with high content of γ-LDPER,using MSCR to evaluate the applicability of the high temperature performance deserves further study.

关 键 词：道路工程 改性沥青 Γ辐照 回收低密度聚乙烯 性能增强 

分 类 号：U414.1[交通运输工程—道路与铁道工程]