This paper discusses the energizing and operation of three sacrificial anode cathodic protection systems used in the rehabilitation of reinforced concrete viaducts in Southeast Alaska. This project is unique due to the exposure of the structures, local weather patterns, tides at the site and the variety of construction techniques used in the original construction. Three separate cathodic protection systems were included in the final design. Included were thermal spayed zinc protection of atmospherically exposed concrete, zinc jackets employed in the splash zone and upper tidal zone and bulk aluminum-zinc-indium anodes used for the lower tidal zone and fully submerged piling.

Subject
Anodic protection, Cathodic protection, Corrosion rate, Freezing, Zinc anodes, Oxygen, Piles, Zinc, Jackets, Elements, Polarization, Concrete, Anodes
Keywords:
aluminum, cathodic protection, concrete, galvanic, jacket anode, prestressed, thermal spray, zinc
© 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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