水泥稳定再生集料抗压强度试验研究

Experimental Research on Unconfined Compressive Strength of Cement Stabilized Recycled Aggregate

为探究水泥稳定建筑垃圾再生集料抗压强度变化规律,试验制定了3种级配、5种再生集料砖块与混凝土块体积比例,在等效5%水泥剂量下,测试了混合料的击实特性与7d、28d无侧限抗压强度。研究结果表明:建筑垃圾再生集料密度小、吸水率高,压碎值随砖块含量的增加近似线性增加;随着砖块含量的增加,混合料最大干密度降低,最佳含水率提高,无侧限抗压强度下降;砖块含量一定时,级配上限时抗压强度最高;砖块含量为100%时,混合料抗压强度为3.46~4.92MPa,可满足路面基层施工规范中道路基层强度最低设计指标。

In order to investigate the property of unconfined compressive strength(UCS)of cement stabilized recycled aggregate from construction and demolition waste,a study is carried out with the variables including three gradations and five proportions between masonry and concrete(by volume).Then the performance of compaction characteristic and unconfined compressive strength(UCS)is tested with equivalent cement content 5%.The experimental results are concluded as follows:construction waste recycled aggregate is featured with low density and high water absorption rate,and its crush value increases approximately linearly with the increase of brick content;as the brick content increases,the maximum dry density of the mixture decreases,the optimal moisture content increases,and the unconfined compressive strength decreases;when the brick content is constant,the compressive strength is the highest at the upper limit of the gradation;when the brick content is 100%,the compressive strength of the mixture is 3.46~4.92 MPa,which can meet the minimum design index of road base strength that stipulated in the specifications for construction of highway roadbases in China.