多聚磷酸与SBS复合改性沥青及其混合料抗老化性能研究

发布时间：2018-07-05 16:42

本文选题：道路工程 + 多聚磷酸　；参考：《公路工程》2016年06期

【摘要】：改善沥青混合料的抗老化性能,对于提高沥青路面的使用寿命有重要意义,基于室内模拟老化试验,采用低温弯曲试验和小梁疲劳试验研究了紫外线老化与热老化前后多聚磷酸(PPA)掺量对SBS改性沥青及其混合料抗老化性能和低温抗裂性能的影响。试验结果表明:PPA有效的提高了复合改性沥青高温荷载作用下模量的弹性分量比例,改善了复合改性沥青及其混合料的高温抗变形能力,但也会对复合改性沥青混合料的低温性能有负面影响,多聚磷酸的掺加能改善复合改性沥青的温度敏感性和老化前后的抗疲劳耐久性,增大PPA可显著提高老化后复合改性沥青混合料的低温抗裂性,PPA对SBS改性沥青的改性机理在于PPA能与SBS改性剂粒子共同交织形成空间网络结构,PPA与沥青质胶团中的亚砜基发生酯化反,增强了SBS改性剂在沥青中的交联作用。
[Abstract]:It is important to improve the anti-aging performance of asphalt mixture for improving the service life of asphalt pavement. Low temperature bending test and trabecular fatigue test were used to study the effect of polyphosphoric acid (PPA) content before and after ultraviolet and thermal aging on the aging resistance and low temperature crack resistance of SBS modified asphalt and its mixture. The test results show that the ratio of elastic component of modulus under high temperature load of composite modified asphalt is improved effectively, and the high temperature deformation resistance of composite modified asphalt and its mixture is improved. The addition of polyphosphoric acid can improve the temperature sensitivity of composite modified asphalt and the fatigue durability before and after aging. Increasing PPA can significantly improve the low temperature crack resistance of composite modified asphalt mixture after aging. The modification mechanism of SBS modified asphalt by PPA is that PPA can interweave with SBS modifier particles to form space network structure of PPA and asphaltene micelles. Esterification of sulfoxide, The crosslinking effect of SBS modifier in asphalt was enhanced.
【作者单位】：中国地质大学(武汉);湖北交通职业技术学院;武汉工程科技学院;
【基金】：国家自然基金项目(51375119)
【分类号】：U414

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