【摘 要】
：
Recycled concrete aggregate(RCA)is often used as a pavement base or sub-base material.One unique concern of RCA used for such purposes is re-cementation.Alt
【机 构】
：
Dept.ofCivilandEnv.Engr.,HongKongPolytechnicUniv.,Kowloon,HongKongR&DDivision,HongKongHighwaysDepart
【出 处】
：
2016年交通基础设施和材料国际会议
论文部分内容阅读
Recycled concrete aggregate(RCA)is often used as a pavement base or sub-base material.One unique concern of RCA used for such purposes is re-cementation.Although re-cementation increases the stiffness and bearing capacity of RCA,it may induce cracking if RCA becomes bound or partially bound.Four approaches were used in this study to investigate RCA re-cementation in pavement sub-base,including long-term monitoring of a trial site,test of RCA samples retrieved from the site,performance simulation based on mechanistic-empirical pavement design guide(ME-PDG),and numerical analysis.The trial site reveals that RCA becomes partially bound after 11 years of road use.The bound material exhibits properties similar to those of cement-treated base(CTB).However,due to variations in the content and composition of fines in RCA,the extent of re-cementation is not uniform in sub-base.According to the analysis results generated by ME-PDG,reflective cracking occurs if RCA is assumed to be CTB.Conversely,if bound RCA is non-monolithic,it may not have significantly negative effect on pavement performance.The fine content or composition of fines in RCA may be specified to further reduce the risk of RCA re-cementation.
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