纤维与天然沥青复合添加剂组成优化及其混合料性能评价

发布时间：2018-04-14 15:33

本文选题：道路工程 + 纤维与天然沥青复合改性沥青混合料　；参考：《公路工程》2017年01期

【摘要】：为改善纤维和天然沥青单一改性沥青混合料的技术缺陷,将木质素、聚酯、玄武岩纤维与BRA岩沥青、TLA湖沥青、NES青川岩沥青进行复配。基于直接剪切试验优化了最佳的天然沥青掺配范围,采用车辙、低温弯曲、浸水马歇尔、冻融劈裂和四分点加载疲劳试验研究了天然沥青与纤维复合改性沥青混合料的路用性能和抗疲劳耐久性,试验结果表明,木质素、聚酯、玄武岩三种单纤维掺量为0.3%,BRA、TLA、NES掺量为8%~10%时天然沥青与纤维复合改性沥青经济性和抗剪切性能最优;将天然沥青与纤维复配后,可兼具纤维与天然沥青各自改性的优势,可实现二者对沥青改性效果的叠加,其混合料兼顾高低温性能、水稳定性和抗疲劳耐久性,且具有良好的经济性,为路面材料改性技术提供了一种新的选择。在0.3%木质素、聚酯、玄武岩纤维掺和8%~10%BRA、TLA、NES掺量范围内,18种天然沥青与纤维复合改性沥青混合料疲劳性能优于SBS改性沥青混合料,推荐用于复合改性沥青中的木质素纤维、聚酯纤维、玄武岩纤维掺量为0.3%,适宜的BRA、TLA、NES掺量分别为8%~10%、8%~12%、8%~10%。
[Abstract]:In order to improve the technical defect of single modified asphalt mixture of fiber and natural asphalt, lignin, polyester and basalt fiber were mixed with BRA rock pitch, TLA lake asphalt, Ness Qingchuan bitumen.Based on the direct shear test, the optimum blending range of natural asphalt was optimized, and the rutting, low temperature bending, and immersion Marshall were adopted.The pavement performance and fatigue durability of natural asphalt and fiber composite modified asphalt mixture were studied by freeze-thaw splitting and four-point loading fatigue test. The results showed that lignin, polyester,When the content of three kinds of single fiber of basalt is 0.3 and the content of BRA-TLANS is 8 ~ 10, the economic efficiency and shear resistance of natural asphalt and fiber composite modified asphalt are the best, and the combination of natural asphalt and fiber can have the advantages of fiber and natural asphalt respectively.It is possible to achieve the superposition of the two to the asphalt modification effect. The mixture has the high and low temperature performance, the water stability and the fatigue resistance durability, and has the good economy, which provides a new choice for the pavement material modification technology.In the range of 0.3% lignin, polyester, basalt fiber and 810% BRATLANES, 18 kinds of natural asphalt and fiber composite modified asphalt mixture have better fatigue performance than SBS modified asphalt mixture. It is recommended to be used as lignin fiber in composite modified asphalt.The content of polyester fiber and basalt fiber is 0.3, and the suitable amount of BRA-TLANES is 810 and 812.
【作者单位】：重庆广播电视大学;武汉翼达建设服务有限公司重庆公司;
【基金】：国家自然基金项目(51462018) 山东省自然科学基金项(ZR2014EEM9311)
【分类号】：U414

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