Effect of Fly Ash on Frost-Resistance and Chloride Ions Diffusion Properties of Marine Concrete  

作　　者：杨文武 钱觉时 章一颖 

机构地区：[1]College of Materials Science and Engineering,Chongqing University [2]College of Civil Engineering and Architecture,Dalian Nationalities University

出　　处：《China Ocean Engineering》2009年第2期367-377,共11页中国海洋工程（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.50572127)

摘　　要：It is necessary to pay more attention to the durability of concrete undergoing freeze-thaw cycles and seawater attack simultaneously.Investigated are the effects of water-binder ratio,fly ash（FA）contents and air-entraining agent on resistance to frost and chloride diffusion of marine concrete blended with FA in natural seawater.The results show that fly ash does not improve the frost resistance of concrete but can improve its resistance to chloride diffusion by addition of less than 30%.The resistance to frost and chloride diffusion of FA concrete can be improved with the decrease of water-binder ratio,and FA may improve both of them simultaneously only being mixed with air-entraining agent.A ratio（named as R）of the frost-resisting durability factor to chloride diffusion coefficient can be used to evaluate the durability of marine concrete.Scanning electron microscope（SEM）analyses are consistent with the evaluations by the value of R.It is necessary to pay more attention to the durability of concrete undergoing freeze-thaw cycles and seawater attack simultaneously.Investigated are the effects of water-binder ratio,fly ash（FA）contents and air-entraining agent on resistance to frost and chloride diffusion of marine concrete blended with FA in natural seawater.The results show that fly ash does not improve the frost resistance of concrete but can improve its resistance to chloride diffusion by addition of less than 30%.The resistance to frost and chloride diffusion of FA concrete can be improved with the decrease of water-binder ratio,and FA may improve both of them simultaneously only being mixed with air-entraining agent.A ratio（named as R）of the frost-resisting durability factor to chloride diffusion coefficient can be used to evaluate the durability of marine concrete.Scanning electron microscope（SEM）analyses are consistent with the evaluations by the value of R.

关 键 词：fly ash marine concrete FREEZING-THAWING chloride ions diffusion assessment method 

分 类 号：TU528[建筑科学—建筑技术科学]