华南理工大学学报(自然科学版) ›› 2012, Vol. 40 ›› Issue (4): 85-89,94.

• 材料科学与技术 • 上一篇    下一篇

胶凝材料组成对钢筋混凝土耐久性的影响

范志宏1,2 黎鹏平2† 苏达根1 王胜年2   

  1. 1.华南理工大学 特种功能材料教育部重点实验室,广东 广州 510640; 2.水工构造物耐久性技术交通行业重点实验室,广东 广州 510230
  • 收稿日期:2011-10-27 修回日期:2011-12-06 出版日期:2012-04-25 发布日期:2012-03-01
  • 通信作者: 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
  • 作者简介:范志宏(1979-) ,男,博士生,主要从事土木工程材料研究.
  • 基金资助:

    国家“十二五”科技支撑计划项目( 2011BAG07B04)

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)

摘要: 利用电化学阻抗法和压汞法等研究了外渗氯盐条件下胶凝材料组成对钢筋混凝土耐久性的影响,结果表明: 随胶凝材料中粉煤灰或矿渣含量的提高,钢筋混凝土耐久性、混凝土电阻率和钢筋电荷转移电阻先增加后减少,钢筋腐蚀速率则先减少后增加; 氯离子临界浓度随钢筋周围溶解氧含量的提高及Ca( OH)2含量的降低而降低; 掺合料取代部分水泥后提高了混凝土的致密性,增大了电荷转移电阻,提高了钝化膜的稳定性,同时会降低混凝土内的Ca( OH)2含量,引起氯离子临界浓度下降.

关键词: 钢筋混凝土, 胶凝材料, 耐久性, 外渗氯离子, 钢筋腐蚀速率, 氯离子临界浓度

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

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