Concrete carbonation is the second cause of corrosion in reinforced concrete structures. Carbonation-induced corrosion tends to develop later, proceeds at slower rates than chloride-induced corrosion, and leads to uniform steel corrosion that would accelerate the crack formation and decrease the structure service life. In inland tropical environments, carbonation-induced corrosion would be the main corrosion mechanism in reinforced concrete. The objective of this investigation was to study the effect of the water/cement ratio in the corrosion rates after complete carbonation of the reinforced concrete specimens. Four different water/cement ratios were used, and the corrosion behavior was monitored using a linear polarization resistance technique. The results were obtained using a potentiostat and a galvanostat with a guard-ring electrical confinement array, both commercially available. The good agreement of the results from both tests provides enough confidence for the use of the galvanostat on field applications.

Subject
Materials, Corrosion rate, Rebar, Inspection, Carbonation depth, Mixtures, Specimen preparation, Steel, Carbonation, Reinforced concrete, Electrical resistance, Concrete, Electrode potential
Keywords:
Carbonation, Concrete, Corrosion, Guard-ring Electrode, Linear Polarization Resistance
© 2004 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2004
Association for Materials Protection and Performance (AMPP)
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