A summary on the disbondment of epoxy coating on reinforcing steel extracted from marine substructures in Florida is presented. The bridges examined in this study had been in service for periods ranging from 3 to 13 years. Disbondment was consistently observed in rebar in bridges older than 4 years. The disbondment developed even in the absence of significant chloride ion contamination of the concrete surrounding the rebar. Continued loss of adhesion was observed in most of the specimens even after prolonged storage (1 month to years) in a desiccator. Contamination of the epoxy-steel interface was modest to very small, and the extent of contamination did not show any distinct correlation with loss of bond.

Subject
Steel structures, Coatings, Contamination, Metal surfaces, Rebar, Disbondment, Epoxy coatings, Corrosion losses, Metals, Steel, Bridges, Concrete, Adhesion
Keywords:
bridges, disbondment, epoxy-coated rebar, marine substructures, reinforced concrete
© 1996 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).
1996
Association for Materials Protection and Performance (AMPP)
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