泡沫轻质混凝土力学特性试验研究  

Experimental Research on Mechanical Properties of Foam Lightweight Concrete

作　　者：苏谦[1,2] 赵文辉[1,2] 王亚威[1,2] 刘亭[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

出　　处：《铁道建筑》2016年第4期144-148,共5页Railway Engineering

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

摘　　要：为研究泡沫轻质混凝土的力学特性,采用微机控制电子万能试验机对湿密度为400~1 000 kg/m^3的泡沫轻质混凝土试样开展单轴压缩试验。结果表明:泡沫轻质混凝土压缩过程分为典型的4个阶段,即调整阶段、弹性阶段、脆性阶段和屈服阶段(震荡屈服和点屈服);当湿密度为400~800 kg/m^3时无侧限抗压强度呈指数增加,当湿密度为800~1 000 kg/m^3时无侧限抗压强度增长效果不明显;当湿密度为400~600 kg/m^3时弹性模量增长缓慢,而当湿密度为600~1 000 kg/m^3时弹性模量增长较迅速,但增长速率逐渐减小;养护龄期前期影响较大,后期影响较小。In order to study the mechanical properties of foam lightweight concrete,the computer-controlled electronic universal testing machine was used to make uniaxial compression tests for foam lightweight concrete specimen with wet density from 400 kg/m3 to 1000 kg/m3. The results show that there are typical four stages in foam lightweight concrete compression process,which are adjustment step,elastic step,brittle step and yield step （ vibration yield and point yield） . The unconfined compression strength increases exponentially when the wet density is from 400 kg/m3 to 800 kg/m3; the unconfined compression strength does not increase obviously when the wet density is in the range of 800 -1000 kg/m3;the elastic modulus increases slowly when the wet density is from 400 kg/m3 to 600 kg/m3; the elastic modulus increases quickly but the growth rate decreases gradually while the wet density is in the range of 600 -1000 kg/m 3;curing period has a larger effect in the early stage and has a less effect in the late stage on mechanical properties of foam lightweight concrete.

关 键 词：泡沫轻质混凝土 湿密度 无侧限抗压强度 弹性模量 养护龄期 

分 类 号：TU472[建筑科学—结构工程]