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Title: Chloride-induced corrosion of steel in cracked concrete – Part I: Experimental studies under accelerated and natural marine environments

Abstract

Parallel corrosion experiments were carried out for 2¼ years by exposing one half of 210 beam specimens (120 × 130 × 375 mm long) to accelerated laboratory corrosion (cyclic wetting and drying) while the other half underwent natural corrosion in a marine tidal zone. Experimental variables were crack width w{sub cr} (0, incipient crack, 0.4, 0.7 mm), cover c (20, 40 mm), binder type (PC, PC/GGBS, PC/FA) and w/b ratio (0.40, 0.55). Results show that corrosion rate (i{sub corr}) was affected by the experimental variables in the following manner: i{sub corr} increased with increase in crack width, and decreased with increase in concrete quality and cover depth. The results also show that the corrosion performance of concretes in the field under natural corrosion cannot be inferred from its performance in the laboratory under accelerated corrosion. Other factors such as corrosion process should be taken into account.

Authors:
 [1]; ;  [2]
  1. School of Civil and Environmental Engineering, University of the Witwatersrand, Johannesburg, Private Bag 3, 2050 Wits (South Africa)
  2. Department of Civil Engineering, University of Cape Town, Private Bag X3, 7701 Rondebosch (South Africa)
Publication Date:
OSTI Identifier:
22696545
Resource Type:
Journal Article
Resource Relation:
Journal Name: Cement and Concrete Research; Journal Volume: 79; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CARBON 20; CONCRETES; CORROSION; CRACKS; DEPTH

Citation Formats

Otieno, M., E-mail: Mike.Otieno@wits.ac.za, Beushausen, H., and Alexander, M. Chloride-induced corrosion of steel in cracked concrete – Part I: Experimental studies under accelerated and natural marine environments. United States: N. p., 2016. Web. doi:10.1016/J.CEMCONRES.2015.08.009.
Otieno, M., E-mail: Mike.Otieno@wits.ac.za, Beushausen, H., & Alexander, M. Chloride-induced corrosion of steel in cracked concrete – Part I: Experimental studies under accelerated and natural marine environments. United States. doi:10.1016/J.CEMCONRES.2015.08.009.
Otieno, M., E-mail: Mike.Otieno@wits.ac.za, Beushausen, H., and Alexander, M. Fri . "Chloride-induced corrosion of steel in cracked concrete – Part I: Experimental studies under accelerated and natural marine environments". United States. doi:10.1016/J.CEMCONRES.2015.08.009.
@article{osti_22696545,
title = {Chloride-induced corrosion of steel in cracked concrete – Part I: Experimental studies under accelerated and natural marine environments},
author = {Otieno, M., E-mail: Mike.Otieno@wits.ac.za and Beushausen, H. and Alexander, M.},
abstractNote = {Parallel corrosion experiments were carried out for 2¼ years by exposing one half of 210 beam specimens (120 × 130 × 375 mm long) to accelerated laboratory corrosion (cyclic wetting and drying) while the other half underwent natural corrosion in a marine tidal zone. Experimental variables were crack width w{sub cr} (0, incipient crack, 0.4, 0.7 mm), cover c (20, 40 mm), binder type (PC, PC/GGBS, PC/FA) and w/b ratio (0.40, 0.55). Results show that corrosion rate (i{sub corr}) was affected by the experimental variables in the following manner: i{sub corr} increased with increase in crack width, and decreased with increase in concrete quality and cover depth. The results also show that the corrosion performance of concretes in the field under natural corrosion cannot be inferred from its performance in the laboratory under accelerated corrosion. Other factors such as corrosion process should be taken into account.},
doi = {10.1016/J.CEMCONRES.2015.08.009},
journal = {Cement and Concrete Research},
number = ,
volume = 79,
place = {United States},
year = {Fri Jan 15 00:00:00 EST 2016},
month = {Fri Jan 15 00:00:00 EST 2016}
}