Chloride-induced corrosion of steel in cracked concrete—Part II: Corrosion rate prediction models

Chloride-induced corrosion rate (icorr) prediction models for RC structures in the marine tidal zone that incorporate the influence of crack width (wcr), cover (c) and concrete quality are proposed. Parallel corrosion experiments were carried out for 2¼years by exposing one half of 210 beam specimen...

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Bibliographic Details
Published in:Cement and concrete research 2016-01, Vol.79, p.386-394
Main Authors: Otieno, M., Beushausen, H., Alexander, M.
Format: Article
Language:English
Subjects:
Accelerated corrosion
Binders
CARBON 20
Chloride-induced corrosion
CHLORIDES
Concretes
CORROSION
Corrosion rate
Corrosion rate prediction
Cracked concrete
CRACKS
FORECASTING
MATERIALS SCIENCE
Mathematical models
Natural corrosion
Stress corrosion cracking
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Summary:Chloride-induced corrosion rate (icorr) prediction models for RC structures in the marine tidal zone that incorporate the influence of crack width (wcr), cover (c) and concrete quality are proposed. Parallel corrosion experiments were carried out for 2¼years by exposing one half of 210 beam specimens (120×130×375mm long) to accelerated laboratory corrosion (cyclic wetting and drying) while the other half underwent natural corrosion in the tidal zone. Experimental variables were wcr (0, incipient crack, 0.4, 0.7mm), c (20, 40mm), binder type (PC, PC/GGBS, PC/FA) and w/b ratio (0.40, 0.55). The two proposed models (one each for accelerated and natural icorr) can aid not only in quantifying the propagation phase, but also provide a novel way to select c, wcr and concrete quality.
ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2015.08.008