橡胶粉纤维沥青混合料高温性能及施工和易性

High Temperature Stability and Workability of Crumb Rubber-modified and Fibers-reinforced Asphalt Mixture

通过比较几种试验方案,从不同的理论角度分析纤维加筋和橡胶粉对混合料的改性机理.试验结果表明:同时采用纤维加筋和干拌橡胶粉技术,可以综合二者优势获得具有良好高温稳定性的多碎石沥青混合料;采用将橡胶粉直接投入搅拌锅的混合料生产工艺,为预溶法沥青改性过程的材料相容性问题提供新思路.实体工程施工经验表明:橡胶粉纤维多碎石沥青混合料施工工艺有别于普通的沥青混合料施工.通过对混合料的施工和易性分析,总结出施工控制函数,提出控制措施;并利用粘弹性理论分析混合料压实过程,提出有效压实能的概念.

By comparing the results of two tests on different asphalt mixtures, the mechanisms of the crumb rubber-modified and fibers-reinforced asphalt mixture are analyzed. The results show that it can improve the high temperature stability of stone asphalt concrete by making use of the advantages of the fibers and the rubbers. Moreover, the technique of dry mixing crumb rubbers in asphalt mixture puts forward a new thought for compatibility between the modified-material and the asphalt. The construc- tion experiences indicate that the construction techniques of crumb rubber-modified and fibers-reinforced asphalt mixture are different from the general asphalt mixture. By means of the analysis on the workability of the asphalt mixture, the function of the construction control and the measures to ensure the construction quality are proposed. Finally, on the basis of viscoelasticity theory, a new concept of effective compaction power and a method to study the compaction techniques of asphalt mixtures are put forward.