00494590

Component

http://onlinepubs.trb.org...trr/1989/1211/1211-006.pdf

https://scholar.google.co...anca&publication_year=1989

Reference cells are needed to measure the potential of embedded steel in cathodically protected, reinforced concrete members to ensure that the level of protection is neither too high nor too low. Embedded cells are more convenient than surface cells where access to the protected surface of the structure is difficult, and they are essential when potential-controlled rectifiers or remote monitoring systems are being used. This paper reports the results of a series of laboratory, outdoor exposure plot, and field tests to evaluate the suitability of candidate embedded reference cells for use in reinforced concrete. Zinc-zinc sulfate, silver-silver chloride, molybdenum-molybdenum oxide, lead-lead oxide cells, and graphite electrodes were evaluated. The graphite electrodes were found to be the most stable with time and the least influenced by changes in temperature or the chloride content of the concrete. They were also inexpensive. The only other cell considered suitable for embedment in concrete was a silver-silver chloride cell, although this type of cell was more affected by temperature and chloride content than was graphite. Large performance variations occurred in some cells of the same type from different sources.

This paper appears in Transportation Research Record No. 1211, Concrete Bridge Design and Maintenance: Steel Corrosion in Concrete. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01414044

p. 60-71

1989

Transportation Research Record

0309048087

Figures (8) ; References (12) ; Tables (4)

Anchoring; Cathodic protection; Chloride content; Costs; Electrodes; Field tests; Laboratory tests; Performance evaluations; Reinforced concrete; Temperature

Embedment

Bridges and other structures; Design; Finance; Highways; I24: Design of Bridges and Retaining Walls

TRIS, TRB, ATRI

May 31 1990 12:00AM

• COLLAPSE OF A SEGMENTAL POST-TENSIONED CONCRETE BRIDGE
• CORRELATION BETWEEN CORROSION OF REINFORCING STEEL AND VOIDS AND CRACKS IN CONCRETE STRUCTURES (WITH DISCUSSION AND CLOSURE)
• DEICING SALT CORROSION WITH AND WITHOUT INHIBITORS
• DETECTION OF FLAWS IN BARS AND CABLES IN CONCRETE BRIDGE STRUCTURES
• DYNAMIC OPTIMIZATION MODEL FOR BRIDGE MANAGEMENT SYSTEMS
• MEASURING RATE OF CORROSION OF STEEL IN FIELD CONCRETE STRUCTURES
• TECHNICAL REVIEW OF CALCIUM NITRITE CORROSION INHIBITOR IN CONCRETE
• VERIFICATION OF COMPOSITE BEHAVIOR OF A PRECAST DECKED SIMPLE SPAN