论文部分内容阅读
采用应变片电测法对纤维沥青混合料在不同种类、不同长度、不同掺量、不同温度下的应变进行了测试,通过温差、应变差与线收缩系数间的关系,得出纤维沥青混合料的线收缩系数,并利用桥接阻裂原理和界面增强原理对试验结果进行了分析。结果表明:在沥青混合料中加入适量纤维后,可以改善沥青混合料的温缩性能;4种纤维沥青混合料中,聚酯纤维b对混合料的温缩性能改善效果最佳,木质素纤维改善效果最差;线收缩系数随着纤维长度和纤维掺量的增长呈现先减小后增大的趋势,适宜的纤维长度和纤维掺量有助于改善沥青混合料的温缩性能;在工程应用中,应将三者优化组合,并与纤维沥青混合料的路用性能相结合进行综合评估,为纤维沥青混合料的优化设计提供帮助。
Strain gauges were used to test the strain of fiber asphalt mixture under different kinds, lengths, dosage and temperature. Through the relationship between temperature difference, strain difference and line shrinkage coefficient, the relationship between fiber asphalt mixture Of the line contraction coefficient, and the use of bridge cracking theory and interface enhancement principle of the test results were analyzed. The results show that: after adding appropriate amount of fiber in the asphalt mixture, it can improve the temperature shrinkability of the asphalt mixture; Among the four kinds of fiber asphalt mixture, the polyester fiber b has the best effect on the improvement of the shrinkage property of the mixture. Lignin fiber The synergistic effect of the fiber shrinkage and the fiber shrinkage is the worst. The shrinkage coefficient of fibers decreases first and then increases with the increase of fiber length and fiber content. Appropriate fiber length and fiber content help to improve the thermal shrinkage of asphalt mixture. Application, the three should be optimized combination, and with the road performance of fiber asphalt mixture to conduct a comprehensive assessment for the optimal design of fiber asphalt mixture to help.