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Title: Effects of cyclic chloride exposure on penetration of concrete cover

Abstract

Concretes are in a state of flux between saturated and partially saturated conditions as they undergo continuous cycles of wetting and drying. In saturated concrete, dissolved ions enter through diffusion, whereas in partially saturated concrete, ion-containing fluids are absorbed by capillary suction and concentrated by evaporation of water. The primary focus of this study was to examine the effects of cyclic wetting and drying with sodium chloride solution on chloride ingress into concrete. Chloride profiles of samples exposed to various lengths and numbers of cycles were determined for three mixtures of concrete: two containing slag and/or silica fume with a 0.4 w/cm (water to cementing materials ratio) and one with a 0.3 w/cm. It was found that longer drying times increase the rate of chloride ingress. A good relationship exists between the depth of chloride penetration and the square root of the number of cycles.

Authors:
;
Publication Date:
Research Org.:
Univ. of Toronto, Ontario (CA)
OSTI Identifier:
20000435
Resource Type:
Journal Article
Journal Name:
Cement and Concrete Research
Additional Journal Information:
Journal Volume: 29; Journal Issue: 9; Other Information: PBD: Sep 1999; Journal ID: ISSN 0008-8846
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CORROSION RESISTANCE; REINFORCED CONCRETE; CHLORIDES; DIFFUSION; AQUEOUS SOLUTIONS; DRYING; CORRELATIONS

Citation Formats

Hong, K., and Hooton, R.D. Effects of cyclic chloride exposure on penetration of concrete cover. United States: N. p., 1999. Web. doi:10.1016/S0008-8846(99)00073-3.
Hong, K., & Hooton, R.D. Effects of cyclic chloride exposure on penetration of concrete cover. United States. doi:10.1016/S0008-8846(99)00073-3.
Hong, K., and Hooton, R.D. Wed . "Effects of cyclic chloride exposure on penetration of concrete cover". United States. doi:10.1016/S0008-8846(99)00073-3.
@article{osti_20000435,
title = {Effects of cyclic chloride exposure on penetration of concrete cover},
author = {Hong, K. and Hooton, R.D.},
abstractNote = {Concretes are in a state of flux between saturated and partially saturated conditions as they undergo continuous cycles of wetting and drying. In saturated concrete, dissolved ions enter through diffusion, whereas in partially saturated concrete, ion-containing fluids are absorbed by capillary suction and concentrated by evaporation of water. The primary focus of this study was to examine the effects of cyclic wetting and drying with sodium chloride solution on chloride ingress into concrete. Chloride profiles of samples exposed to various lengths and numbers of cycles were determined for three mixtures of concrete: two containing slag and/or silica fume with a 0.4 w/cm (water to cementing materials ratio) and one with a 0.3 w/cm. It was found that longer drying times increase the rate of chloride ingress. A good relationship exists between the depth of chloride penetration and the square root of the number of cycles.},
doi = {10.1016/S0008-8846(99)00073-3},
journal = {Cement and Concrete Research},
issn = {0008-8846},
number = 9,
volume = 29,
place = {United States},
year = {1999},
month = {9}
}