多聚磷酸改性沥青及其混合料低温性能研究

发布时间：2018-04-22 14:21

本文选题：道路工程 + 多聚磷酸　；参考：《湖南大学学报(自然科学版)》2017年05期

【摘要】：采用常规低温性能试验和Superpave低温性能试验,研究了不同类型多聚磷酸(PPA)改性沥青胶结料的低温性能,对比分析了沥青胶结料低温性能评价指标之间的相应关系,并采用小梁弯曲试验和冻断试验验证了沥青混合料的低温抗裂性能,研究了沥青胶结料与混合料低温性能之间的相关性.最后对不同低温性能评价指标的合理性和不足之处进行了较为深入的分析.结果表明,PPA掺入减小了沥青的延度和劲度模量,老化对PPA改性沥青低温性能的影响显著;应变能密度指标表明PPA可以改善沥青混合料低温抗裂性;PPA复配SBR的改性沥青低温效果要优于SBR改性沥青;冻断温度与冻断强度能较准确地评价多聚磷酸改性沥青混合料的低温抗裂性能.
[Abstract]:The low temperature performance of different types of polyphosphate modified asphalt binder was studied by conventional low temperature performance test and Superpave low temperature performance test, and the relationship between the evaluation index of low temperature performance of asphalt binder was compared and analyzed. The low temperature crack resistance of asphalt mixture was verified by trabecular bending test and cold breaking test, and the correlation between asphalt binder and low temperature performance of mixture was studied. Finally, the rationality and deficiency of different low-temperature performance evaluation indexes are analyzed deeply. The results showed that the ductility and stiffness modulus of PPA modified asphalt were decreased, and the effect of aging on the low temperature performance of PPA modified asphalt was significant. The strain energy density index shows that PPA can improve the low temperature crack resistance of asphalt mixture. The low temperature effect of modified asphalt with SBR is better than that of SBR modified asphalt. The freezing temperature and strength can accurately evaluate the low temperature crack resistance of polyphosphoric acid modified asphalt mixture.
【作者单位】：长安大学道路结构与材料交通行业重点实验室;
【基金】：国家自然科学基金资助项目(51278060)~~
【分类号】：U414

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