再生混凝土收缩补偿及其钢管混凝土轴压短柱试验研究  

An Experimental Study on Shrinkage Compensating of Recycled Aggregate Concrete and Axial Compression of Concrete Filled Steel Tubular Short Columns

作　　者：相军[1] 张卫东[1] 华竹君[2] 

机构地区：[1]淮阴工学院建筑工程学院,江苏淮安223001 [2]南京工业大学土木工程学院,南京210009

出　　处：《建筑钢结构进展》2013年第6期52-57,共6页Progress in Steel Building Structures

基　　金：江苏省教育厅自然科学项目(11KJD560003)

摘　　要：通过掺入不同掺量的膨胀剂对再生混凝土的干缩变形进行补偿,制成补偿收缩钢管再生混凝土,试验分析不同掺量的膨胀剂对于钢管再生混凝土短柱轴压力学性能的影响。试验结果表明:掺入适量的膨胀剂能够提高再生混凝土的强度和短柱轴压极限荷载,膨胀剂掺量过大则会降低再生混凝土的强度和短柱轴压极限荷载;补偿收缩钢管再生混凝土短柱的钢管与再生混凝土之间相互作用的产生要早于未经收缩补偿钢管再生混凝土;补偿收缩钢管再生混凝土与未经收缩补偿钢管再生混凝土的变形性能较为相似。Shrinkage of recycled aggregate concrete(RAC)can be compensatedby adding expansion agent.In this paper,RAC with expansion agent is studied,and this type of concrete is also used to make concrete filled steel tubular(CFST) short columns to evaluate the influence of different mixing amount of expansion agent on the mechanical behavior of CFST short columns under axial load.The research showed that adding appropriate amount of expansion agent can improve the strength of RAC and the ultimate load of CFSTshort columns under axial compression.However,the two above mentioned properties will decrease by adding too much expansion agent.Also,the interaction between RAC with expansion agent and steel tube occurs sooner than that of RAC without expansion agent.The deformation behaviors of two types of concrete are similar.

关 键 词：钢管再生混凝土 膨胀剂 干缩变形 收缩补偿 轴压试验 

分 类 号：TU398.9[建筑科学—结构工程]