As a means to assess achieving intended service life on marine exposed bridge structures, the corrosion propagation stage is being investigated. Corrosion of the steel reinforcement during the corrosion propagation was monitored on selected laboratory specimens for several years and on other specimens for a few months. The specimens were prepared with 5 cm of concrete cover and low water to cementitious (i.e., 0.41) ratio. Chloride was not present initially. An electric field was applied to drive the chlorides and reach the rebar depth until it exceeded the chloride threshold. Linear polarization tests have been monitored for over 4 years on eight specimens, and for a shorter period (approx. six months) on eight other specimens. The on-going study will assist in providing the Florida Department of Transportation with guidance as to how fast the corrosion rate will be at various chloride concentrations for rebars embedded in concrete. With these corrosion rate values, it would be possible to obtain estimations on how long it would take before cracks appear.

Subject
Electric current, Mass loss, Rebar, Corrosion cracking, Potential measurements, Reservoirs, Corrosion products, Corrosion propagation, Specimen preparation, Electric potential, Chlorides, Concrete, Electrode potential
Keywords:
Concrete Cover, Corrosion Propagation Period, Corroding Length
© 2017 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).
2017
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.