THE DYNAMIC ELASTIC MODULUS AND MICROSTRUCTURE STUDY OF HIGH PERFORMANCE CONCRETE IN SULFATE ENVIRONMENT

摘要：

Aimed at determining the durability of concrete in very salty regions,this paperdescribes a study carried out to examine the performance of various high performance fineaggregate concrete in a sulfate environment,such as high performance concrete inside acomposite additive,and Portland cement concrete,and sulfate resistant cement concrete. Theyexperienced dry-wet cycles in sodium sulfate solutions. By examining the changes of elasticmoduli and analyzing the SEM of the concrete,the test results show that the salt resistance ofsulfate resistant cement concrete is no better than Portland cement concrete in the extremelyagressive dry-wet cycle environment,and high performance concrete containing a compositeadditive has better resistance to a sulfate environment. Besides,the composite additive cancreate the environment for a second hydration to reduce the amount of Ca(OH)2 inside theconcrete,and build additional C-S-H gel to reform the microstructure of concrete effectively.Finally,the paper offers some advice for mixing concrete in salt regions.

关键词： high performance concrete dynamic elastic modulus dry-wet cycle hydrate

作者: QIAO Hong-xia ZHU Yan-peng ZHOU Ming-ru HE Zhong-mao

作者单位: College of Civil Engineering,Lanzhou Univ.of Tech.,Lanzhou 730050,PR China,Western Center of Disaste College of Civil Engineering,Lanzhou Univ.of Tech.,Lanzhou 730050,PR China Gansu science Research Institute of Civil Engineering,Lanzhou 730020,PR China

会议类型: 国际会议

会议名称: The International Conference on Durability of Concrete Structures(2008年混凝土结构耐久性国际学术会议)

会议地点: 杭州

会议语种:英文

页码: 426-429

在线出版日期: 2008-11-01（万方平台首次上网日期，不代表论文的发表时间）