Journal of South China University of Technology(Natural Science Edition) ›› 2012, Vol. 40 ›› Issue (4): 85-89,94.

• Materials Science & Technology • Previous Articles     Next Articles

Influence of Cementitious Material Composition on Durability of Reinforced Concrete

Fan Zhi-hong1,2  Li Peng-ping2  Su Da-gen1  Wang Sheng-nian2   

  1. 1. Key Laboratory of Specially Functional Materials of the Ministry of Education,South China University of Technology,Guangzhou 510640,Guangdong,China; 2. Key Laboratory of Harbor&Marine Structure Durability Technology of the Ministry of Communications,Guangzhou 510230,Guangdong,China
  • Received:2011-10-27 Revised:2011-12-06 Online:2012-04-25 Published:2012-03-01
  • Contact: 黎鹏平(1980-) ，男，博士，主要从事水泥、混凝土材料研究． E-mail: lpp232@yahoo.com.cn E-mail:fzhihong@ gzpcc.com
  • About author:范志宏(1979-) ，男，博士生，主要从事土木工程材料研究．
  • Supported by:

    国家“十二五”科技支撑计划项目( 2011BAG07B04)

PDF

971

Abstract:

This paper deals with the influences of cementitious material composition on the durability of reinforced concrete with extravasated chloride via electrochemical impedance spectroscopy and MIP test. The results show that,with the increases of fly ash or slag content in the cementitious material,the durability,the resistivity and the charge transfer resistance of reinforced concrete all increase first and then decrease,while the corrosion rate of steel varies in an opposite trend; and that the chloride threshold concentration decreases with the increase of dissolved oxygen content and with the decrease of Ca(OH)2 content around the steel. Moreover,it is found that,when cement is partially substituted with fly ash or slag,the density of the concrete increases,which results in the increase of charge transfer resistance,the improvement of stability of the passive film,the decrease of Ca(OH)2 content,and,finally,the decrease of the chloride threshold concentration.

Key words: reinforced concrete, cementitious material, durability, extravasated chloride, steel corrosion rate, chloride threshold concentration

CLC Number: