外掺剂对乳化沥青冷再生混合料性能影响的宏微观分析  

Macro and Micro Analysis of the Influence of Admixtures on the Performance of Emulsified Asphalt Cold Recycled Mixture

作　　者：杨彦海[1] 熊艺衡 陈冠良 岳靓 杨野[1,2] YANG Yanhai;XIONG Yiheng;CHEN Guanliang;YUE Liang;YANG Ye(School of Transportation and Surveying Engineering,Shenyang Jianzhu University,Shenyang,China,110168;College of Transportation Engineering,Dalian Maritime University,Dalian,China,116026)

机构地区：[1]沈阳建筑大学交通与测绘工程学院,辽宁沈阳110168 [2]大连海事大学交通运输工程学院,辽宁大连116026

出　　处：《沈阳建筑大学学报（自然科学版）》2023年第4期723-730,共8页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(52278454);沈阳市科技计划项目(22-322-3-22);高性能土木工程材料国家重点实验室开放基金项目(2019CEM010)。

摘　　要：目的研究微珠、硅灰和减水剂对乳化沥青冷再生混合料路用性能的影响,分析外掺料的作用机理。方法通过室内路用性能试验评价外掺料对冷再生混合料性能影响效果,结合扫描电镜技术观测沥青胶浆微观形貌,从宏微观角度分析三种外掺料的作用机理。结果混合料高温贯入强度最高可提升253%,低温劈裂强度最高可提升62%,冻融劈裂强度比最高可达到86.3%;通过扫描电镜观测沥青胶浆的微观形貌发现:加入外掺料,沥青胶浆呈现空间骨架结构,不仅具有良好的稳定性且沥青胶浆强度增强,同时外掺料还能填充混合料空隙,降低混合料空隙率,极大地改善了混合料性能。结论三种外掺料对混合料路用性能具有良好的改善效果,沥青胶浆呈现空间骨架结构,极大地改善了混合料性能。The purpose of this study was to analyze the effect of microbeads,silica fume and water reducing agent on the road performance of emulsified asphalt cold recycled mixture,and analyze the mechanism of action of external admixtures.The effect of external admixtures on the performance of cold recycled mixture was evaluated by indoor road performance test,and the microscopic morphology of asphalt mortar was observed by scanning electron microscope technology,and the action mechanism of three external admixtures was analyzed from a macro and micro-perspective.The high temperature penetration strength of the mixture can be increased by up to 346%,the low temperature splitting strength can be increased by up to 62%,and the freeze-thaw splitting strength ratio can be up to 86.3%.The microscopic morphology of asphalt mortar was observed by scanning electron microscope,and it was found that the addition of external admixtures showed that the asphalt mortar showed the spatial skeleton structure,which not only had good stability and enhanced the strength of asphalt mortar,but also the external admixture could fill the voids of the mixture,reduce the void ratio of the mixture and greatly improve the performance of the mixture.In conclusion,the three external admixtures have a good effect on improving the road performance of the mixture,and the asphalt mortar presents the spatial skeleton structure,which greatly improves the performance of the mixture.

关 键 词：沥青路面 乳化沥青冷再生 硅灰 微珠 减水剂 路用性能 

分 类 号：TU997[建筑科学—市政工程]