The excellent corrosion resistance of steel in concrete is affected adversely by chloride ions. In this work, we present the long-term results of experiments that were initiated in 1984 and first reported in 1985. The effects of calcium nitrite corrosion inhibitor, cement factor, water to cement ratio, and tricalcium aluminate concentration on the corrosion resistance of reinforcing steel embedded as a function of time are documented. Results of polarization resistance a.c impedance measurements of specimens partially submerged in 3% sodium chloride are presented as a function of time. Additionally, chloride analyses of the concrete and visual observations of the steel over time are also presented. The results are in good agreement with long-term observations on concrete structures. The main findings are that calcium nitrite is an effective corrosion inhibitor, which gives very good performance at w/c ratios under 0.5, and always improves corrosion resistance; and that the electrochemical testing techniques accurately predict the degree of corrosion that has occurred and are non destructive.

Subject
Corrosion rate, Rebar, Sodium chloride, Corrosion initiation, Impedance, Calcium nitrite, Electrical resistivity, Steel, Corrosion resistance, Chlorides, Polarization resistance, Corrosion potential, Concrete
© 1987 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).
1987
Association for Materials Protection and Performance (AMPP)
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