One final portion of the Federal Highway System involves a 10.7-mile (17.22 kilometer) section on the Island of Oahu in Hawaii. The H-3 Highway connects Honolulu and the Haiku side of the island and involves approximately 5,200 feet (1,585 meters) of double tunnel through the volcanic soils of the Koolau Mountain Range. Portions of one elevated section traverses the Omega VLF Transmitter Station at Haiku. The project presented a unique design challenge due to the combination of marine, combustion exhaust, volcanic soil, and interference environments. This paper discusses the investigative and design measures to protect the various structures on this $1 billion project.

Subject
Steel structures, Underground structures, Piping, Cathodic protection, Rebar, Steel, Stray current, Highways, Tunnels, Corrosion protection, Copper, Soil, Concrete
Keywords:
alkaline environment, cathodic protection, electromagnetic interference, Faraday shield, fire water and drainage piping, hot dip galvanizing, hydrogen embrittlement, interference current, Omega Transmitter, stray current
© 1991 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).
1991
Association for Materials Protection and Performance (AMPP)
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