多聚磷酸复合改性沥青混合料的路用性能

发布时间：2018-03-21 09:27

本文选题：道路工程　切入点：多聚磷酸　出处：《建筑材料学报》2017年02期 　论文类型：期刊论文

【摘要】：采用重复蠕变恢复试验分析了多聚磷酸对基质沥青、SBS及SBR改性沥青抗变形恢复能力的影响,并通过贯入剪切试验、半圆弯拉试验及弯曲疲劳试验评价了多聚磷酸对基质沥青混合料、SBS改性沥青混合料及SBR改性沥青混合料抗剪切性能、低温抗裂性能及疲劳性能的影响,采用Weibull分布分析了不同沥青混合料在不同失效概率下的疲劳性能.结果表明:多聚磷酸的掺入显著增加了沥青的黏度,对其弹性变形恢复能力贡献较小,而SBS改性剂可大幅度提高沥青的弹性变形恢复能力;多聚磷酸能够明显改善沥青混合料的高温抗剪稳定性;通过复配SBS或SBR改性剂,可有效弥补多聚磷酸对沥青混合料低温性能的负面影响;多聚磷酸对沥青混合料的疲劳性能也有一定程度的改善.
[Abstract]:The effect of polyphosphoric acid on the deformability recovery ability of SBR and SBR modified asphalt was analyzed by repeated creep recovery test, and the penetration shear test was carried out. The effects of polyphosphoric acid on shear resistance, low temperature crack resistance and fatigue performance of SBR modified asphalt mixture and base asphalt mixture were evaluated by semi-circular bending tensile test and bending fatigue test. The fatigue properties of different asphalt mixtures under different failure probability were analyzed by using Weibull distribution. The results showed that the addition of polyphosphoric acid increased the viscosity of asphalt significantly and contributed little to the resilience of asphalt to elastic deformation. SBS modifier can greatly improve the resilience of asphalt, polyphosphoric acid can obviously improve the high temperature shear stability of asphalt mixture, and by adding SBS or SBR modifier, It can effectively compensate for the negative effect of polyphosphoric acid on the low temperature performance of asphalt mixture and improve the fatigue performance of asphalt mixture to some extent.
【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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