Shrinkage and Expansive Strain of Concrete with Fly Ash and Expansive Agent  

作　　者：高培伟 

机构地区：[1]Department of Civil Engineering,Nanjing University of Aeronautics & Astronautics

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2009年第1期150-153,共4页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China (No. 60672166);the Bureau of Water Resources & Hydropower Research of China (No. SPKJ006-13-01-01)

摘　　要：The effects of fly ash and MgO-type expansive agent on the shrinkage and expan-sive strain of concrete with high magnesia cement were investigated. The results show that high volumes of fly ash may reduce the shrinkage strain of concrete and inhibit the expansive strain of concrete with MgO-type expansive agent, but can not eliminate the shrinkage of concrete. MgO-type expansive agent may produce expansive strain and compensate the shrinkage strain of concrete, re-lieve the cracking risk, but the hydration product of magnesia tends to get together in paste and pro-duce expansive cracking of concrete with high magnesia content according to SEM observation.The effects of fly ash and MgO-type expansive agent on the shrinkage and expan-sive strain of concrete with high magnesia cement were investigated. The results show that high volumes of fly ash may reduce the shrinkage strain of concrete and inhibit the expansive strain of concrete with MgO-type expansive agent, but can not eliminate the shrinkage of concrete. MgO-type expansive agent may produce expansive strain and compensate the shrinkage strain of concrete, re-lieve the cracking risk, but the hydration product of magnesia tends to get together in paste and pro-duce expansive cracking of concrete with high magnesia content according to SEM observation.

关 键 词：high volumes of fly ash MgO-bearing expansive agent high magnesia cement volume stability 

分 类 号：TU528.2[建筑科学—建筑技术科学]