Long term performance of chloride binding capacity in fly ash concrete in a marine environment

被引:150
作者
Cheewaketa, T. [2 ]
Jaturapitakkul, C. [2 ]
Chalee, W. [1 ]
机构
[1] Burapha Univ, Fac Engn, Dept Civil Engn, Chon Buri 20131, Thailand
[2] King Mongkuts Univ Technol Thonburi, Dept Civil Engn, Fac Engn, Bangkok 10140, Thailand
关键词
Chloride binding capacity; Total chloride; Free chloride; Fly ash; Concrete; Marine environment; Thailand; DIFFUSION-COEFFICIENT; GGBS CONCRETE; CEMENT PASTE; CORROSION; STEEL; PREDICTION; REBAR; TIME;
D O I
10.1016/j.conbuildmat.2009.12.039
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
The capacity of binding chloride ions in fly ash concrete under marine exposure was studied. The free and total chloride contents in concrete were determined by water and acid-soluble methods, respectively. In order to study the effects of W/B ratios, exposure time, and fly ash contents on chloride binding capacity of concrete in a marine site, a class F fly ash was used as a partial replacement of Portland cement type I at 0%, 15%, 25%, 35%, and 50% by weight of binder. Water to binder ratios (WIB) were varied at 0.45, 0.55, and 0.65. Concrete cube specimens of 200 mm were cast and placed into the tidal zone of a marine environment in the Gulf of Thailand. Consequently, acid-soluble and water-soluble chlorides in the concrete were measured after the concrete was exposed to the tidal zone for 3, 4, 5, and 7 years. It was found that the percentage of chloride binding capacity compared to total chloride content increased with the increase of fly ash in the concrete. The percentage of chloride binding capacity significantly decreased within 3-4 years after the concrete was exposed to the marine environment, and then its value was almost constant. The research also showed that the W/B ratio does not noticeably affect the chloride binding capacity of concrete. (C) 2009 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1352 / 1357
页数:6
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