Interaction between corrosion crack width and steel loss in RC beams corroded under load
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Publication Details
Author list: Malumbela G, Alexander M, Moyo P
Publisher: Elsevier
Place: OXFORD
Publication year: 2010
Journal: Cement and Concrete Research (0008-8846)
Journal acronym: CEMENT CONCRETE RES
Volume number: 40
Issue number: 9
Start page: 1419
End page: 1428
Number of pages: 10
ISSN: 0008-8846
Languages: English-Great Britain (EN-GB)
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Abstract
This paper presents results and discussions on an experimental study conducted to relate the rate of widening of corrosion cracks with the pattern of corrosion cracks as well as the level of steel corrosion for RC beams (153 x 254 x 3000 mm) that were corroded whilst subjected to varying levels of sustained loads. Steel corrosion was limited to the tensile reinforcement and to a length of 700 mm at the centre of the beams. The rate of widening of corrosion cracks as well as strains on uncracked faces of RC beams was constantly monitored during the corrosion process, along the corrosion region and along other potential cracking faces of beams using a demec gauge. The distribution of the gravimetric mass loss of steel along the corrosion region was measured at the end of the corrosion process. The results obtained showed that: the rate of widening of each corrosion crack is dependent on the overall pattern of the cracks whilst the rate of corrosion is independent of the pattern of corrosion cracks. A mass loss of steel of 1% was found to induce a corrosion crack width of about 0.04 mm. (C) 2010 Elsevier Ltd. All rights reserved.
Keywords
Concrete (E), Corrosion (C), Crack Detection (B), Service life
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