Predicting the chloride penetration of fly ash concrete in seawater

被引:149
作者
Chalee, W. [2 ]
Jaturapitakkul, C. [1 ]
Chindaprasirt, P. [3 ]
机构
[1] KMUTT, Dept Civil Engn, Fac Engn, Bangkok 10140, Thailand
[2] Burapha Univ, Dept Civil Engn, Fac Engn, Chon Buri 20131, Thailand
[3] Khon Kaen Univ, Dept Civil Engn, Fac Engn, Khon Kaen 40000, Thailand
关键词
Chloride diffusion; Corrosion; Fly ash; Prediction; Seawater; MARINE-ENVIRONMENT; CORROSION; STRENGTH; PERMEABILITY; DIFFUSION; PROFILES;
D O I
10.1016/j.marstruc.2008.12.001
中图分类号
U6 [水路运输]; P75 [海洋工程];
学科分类号
0814 ; 081505 ; 0824 ; 082401 ;
摘要
In this study, a model for predicting chloride penetration in fly ash concrete under long-term exposure in a marine environment is developed. The empirical model was based on 2-, 3-, 4-, and 5-year investigation of concretes in a marine site. Regression analysis of the data was carried out by applying Fick's second law of diffusion to generate an empirical formula for predicting chloride concentration in concrete. The model uses the water to binder (W/B) ratio, fly ash content, distance from the concrete surface, and exposure time. Model validation revealed that the predicted chloride concentration levels were within a +/- 25% error margin (R-2 = 0.91 - 0.99) in the samples used to develop the model. The model was also verified using data from previous laboratory and field studies. Most predicted chloride concentration levels were within a +/- 30% margin of error from field samples. The model also predicted the strong effect of fly ash and W/B ratio on reducing chloride diffusion in concrete. Results clearly indicated that a high volume fly ash replacement (up to 50% by weight of binder) and a low W/B ratio will yield good chloride resistance in concrete under long-term exposure in a marine environment. (C) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码:341 / 353
页数:13
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