早强剂对泡沫轻质混凝土抗压强度及弹性模量的影响试验研究  

Experimental study on influence of hardening accelerator on compressive strength and elastic modulus of foamed lightweight concrete

作　　者：苏谦[1,2] 王亚威[1,2] 赵文辉[1,2] 朱俊杰[3] 刘杰[1,2] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]西南交通大学高速铁路线路工程教育部重点实验室,四川成都610031 [3]西南科技大学土木工程与建筑学院,四川绵阳621010

出　　处：《铁道建筑》2015年第12期138-141,共4页Railway Engineering

基　　金：中国铁路总公司科技研究开发计划课题(2014G003-E);教育部新世纪人才计划项目(NCET-12-0941)

摘　　要：采用微机控制电子万能试验机,对湿密度分别为400,700和1 000 kg/m^3的复合发泡剂泡沫轻质混凝土试样进行室内单轴压缩试验,研究了氯化钙和硫酸钠两种早强剂对泡沫轻质混凝土抗压强度及弹性模量的影响。结果表明:不同密度泡沫轻质混凝土试样的抗压强度和弹性模量均随着养护龄期的增长而增大,且早期增长较快,后期增速逐渐降低;两种早强剂均可显著提高泡沫轻质混凝土的早期抗压强度和弹性模量,尤其是硫酸钠早强剂早强效果更显著;两种早强剂对泡沫轻质混凝土的后期抗压强度和弹性模量影响不大。With the help of micro-controlled electronic universal testing machine,the paper carries out indoor uniaxial compressive test to the foam lightweight concrete samples at hand with the integrated foaming agents displaying a moisture density of 400,700 and 1 000 kg / m3. It aims to unveil the influence of two hardening accelerator—calcium chloride and sodium sulfate—on the compressive strength and elastic modulus of the specimens. The results show that the increase of maintenance age brings up the compressive strength and the elastic modulus of the samples. The rise ratio proceeds at a faster speed in the early stage and then decreases gradually in later stage. Though both hardening accelerator largely improve the performance of the concrete at the beginning of the experiment,sodium sulfate in particular,their influence is hardly noticeable at the end.

关 键 词：泡沫轻质混凝土 早强剂 抗压强度 弹性模量 养护龄期 

分 类 号：TU528.2[建筑科学—建筑技术科学]