Laboratory evaluations were carried out on a series of anode materials which could be used for sacrificial cathodic protection of reinforced concrete bridge decks. These included aluminum, magnesium, and zinc alloys. Anodes were fabricated into test coupons and coupled to small lengths of reinforcing steel. The anode/steel couples were placed in simulated concrete environments consisting of sealed containers filled with silica sand treated with a mixed alkali solution containing 6 kg/m3 of chloride ion by volume of sand. The treated sands were dried to obtain resistivities of 23,100 and 260 ohm-m. Measurements of current flow, circuit resistance, potential, and depolarization were made over a period of 18 weeks. Based on results obtained, aluminum and zinc anodes were found to hold the most promise for use as galvanic anodes in reinforced concrete bridge decks.

Subject
Materials, Galvanic anodes, Sand, Aluminum, Rebar, Zinc anodes, Magnesium anodes, Anode resistance, Steel, Magnesium, Zinc, Aluminum alloys, Concrete
Keywords:
alkalies, aluminium, cathodic protection, chlorides, concrete, galvanic anodes, magnesium, reinforcing steel, zinc
© 1995 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).
1995
Association for Materials Protection and Performance (AMPP)
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