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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 (LDPE_R) modified asphalt, corresponding modified asphalt was prepared by recycling gamma ray (γ) irradiated recycled low density polyethylene polymer. The mechanism of chemical modification was studied by surface morphology and FTIR spectroscopy. The multi-stress creep recovery test (MSCR) was used to study the creep recovery characteristics of γ-LDPE_R modified asphalt. The results show that the effect of γ-LDPE_R on asphalt strengthens the temperature stability of asphalt and the γ-LDPE_R polymer has better high temperature performance. When the surface of LDPE_R is irradiated with gamma ray, free radicals and some functional groups are formed, which makes the polymer modifier and bitumen form stronger chemical bonds, which improves the compatibility of modified bitumen. With the increase of γ-LDPE_R content, the stability of modified asphalt increased at high temperature. However, the applicability of MSCR to evaluate the high temperature performance of modified asphalt with high content of γ-LDPE_R deserves further study.