Behaviour of RC beams corroded under sustained service loads

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Publication Details

Author list: Malumbela G, Moyo P, Alexander M

Publisher: Elsevier

Place: OXFORD

Publication year: 2009

Journal: Construction and Building Materials (0950-0618)

Journal acronym: CONSTR BUILD MATER

Volume number: 23

Issue number: 11

Start page: 3346

End page: 3351

Number of pages: 6

ISSN: 0950-0618

eISSN: 1879-0526

Languages: English-Great Britain (EN-GB)

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Abstract

This paper presents the results of an experimental study conducted to characterize the structural behaviour of reinforced concrete beams corroded whilst subjected to constant sustained service loads. Corrosion of tensile steel bars was induced by an accelerated corrosion process using a 5% solution of NaCl and a constant impressed current. Four RC beams were tested, each with a width of 153 mm, a depth of 254 mm and a length of 3000 mm. Beams were tested whilst under a load equivalent to 1%, 8% and 12% of the ultimate load. Longitudinal tensile and compressive strains were monitored during the corrosion process and used to determine the variation of the depth of the neutral axis, the curvature and the second moment of area of beams with the time of electrolysis. The results indicate that the longitudinal strains, the depth of the neutral axis and the curvature of beams depend on both the level of corrosion and the applied service load whilst the second moment of area is mostly influenced by the level of corrosion. (C) 2009 Elsevier Ltd. All rights reserved.

Keywords

corrosion, Curvature, Neutral axis, Second moment of area, Strains, Sustained load

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