温拌再生沥青混合料的压实特性研究  

Study on Compaction Characteristics of Warm Mixed Reclaimed Mixture

作　　者：纪小平[1] 许辉 侯月琴[1] 谭学章 

机构地区：[1]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064 [2]甘肃省公路管理局,甘肃兰州730030 [3]甘肃省高等级公路建设开发有限公司,甘肃兰州730030

出　　处：《建筑材料学报》2014年第2期349-354,共6页Journal of Building Materials

基　　金：中国博士后科学基金资助项目(2013M532004);中央高校基本科研业务费专项资金资助项目(CHD2011JC164);甘肃省科技支撑计划(1011GKCA020)

摘　　要：提出温拌再生沥青混合料(WMRA)拌和与成型温度的确定方法,采用旋转压实仪(SGC)成型试件,对比分析热拌再生沥青混合料(HMRA)和WMRA的体积参数及基于SGC密实曲线的压实特性参数.结果表明:随着回收沥青路面材料(RAP)掺配量的提高,再生沥青混合料的密实曲线斜率K1,K2值降低,空隙率、压实能量指数(CEI)和交通密实指数(TDI)增大,再生沥青混合料的可压实性和压实速率逐渐降低、开放交通后抵抗变形的能力逐渐增加;当WMRA的成型温度降低30℃时,其空隙率和CEI略小于HMRA,说明温拌剂大幅提高了再生沥青混合料的和易性;WMRA和HMRA的K1,K2和TDI的均值基本一致,说明温拌剂对再生沥青混合料的碾压速率和抗变形能力基本无影响.A method for determining the mixing and compaction temperature of warm mixed reclaimed as- phalt mixture（WMRA） was proposed and superpave gyratory compacter（SGC） was used to prepare the specimens. The volume parameters and densification characteristics of SGC densification curve were com- pared with WMRA and hot mixed reclaimed asphalt mixture（HMRA）. Research results indicate that the slopes of densification curve K1 and K2 decrease, and air void（VV）, compaction energy index（CEI） and traffic densification index（TDI） gradually increase as the proportion of recycled asphalt pavement（RAP） increasing. The compacting performance and compaction speed gradually decrease and the capacity of re- sistance from deformation after opening to traffic increases as the proportion of RAP increasing. The VV and CEI of WMRA are smaller than those of HMRA when the compaction temperature is 30 ~C lower in preparation of the specimens of WMRA, with the result that the warm mix agents can greatly improve the workability of mixtures. The K1 , K2 and TDI are almost equivalent between WMRA and HMRA, that is say, the warm mix agents are incapable to improve the compaction speed and resistance from deformation.

关 键 词：温拌再生沥青混合料 成型温度 压实特性 密实曲线 

分 类 号：U414.75[交通运输工程—道路与铁道工程]