Experiments were performed to determine the possible extent of galvanic corrosion when CFRP and steel are in contact in chloride contaminated concrete. Three concrete environments (water-to-cement (w/c) ratio of 0.41) at relative humidities (R.H.) of ~60%, ~80% and ~95%, and 14 kg/m3 chloride were investigated. The CFRP composite potential reached between -180 and -590 mV (vs CSE) when it was in contact with steel at these environments. Results showed significant galvanic action in the 80% RH chloride contaminated concrete (nominal steel current densities as high as 0.3 μA/cm2).

Subject
Steel surfaces, Cyclic polarization, Couplings, Rods, Composites, Steel, Electric potential, Carbon fiber, Galvanic current, Chlorides, Damage, Concrete, Electrode potential
Keywords:
galvanic corrosion, CFRP, Carbon Fiber Reinforced Plastics, concrete, relative humidity, chloride contamination
© 1998 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).
1998
Association for Materials Protection and Performance (AMPP)
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