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Microanalysis in the Development of Thermal-Sprayed Anodes for the Cathodic Protection of Reinforced Concrete Bridges.

Published online by Cambridge University Press:  02 July 2020

W.K. Collins ,
S.D. Cramer ,
B.S. Covino Jr. ,
R.D. Govier ,
G.R. Holcomb ,
S.J. Bullard  and
M. Laylor
W.K. Collins
Affiliation:
Albany Research Center, U.S. Department of Energy, Albany, OR97321
S.D. Cramer
Affiliation:
Albany Research Center, U.S. Department of Energy, Albany, OR97321
B.S. Covino Jr.
Affiliation:
Albany Research Center, U.S. Department of Energy, Albany, OR97321
R.D. Govier
Affiliation:
Albany Research Center, U.S. Department of Energy, Albany, OR97321
G.R. Holcomb
Affiliation:
Albany Research Center, U.S. Department of Energy, Albany, OR97321
S.J. Bullard
Affiliation:
Albany Research Center, U.S. Department of Energy, Albany, OR97321
M. Laylor
Affiliation:
Research Unit, Oregon Department of Transportation, Salem, OR97310
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Extract

Microanalysis has proved crucial in developing thermal-sprayed metal coatings on the surface of reinforced concrete to serve as anodes in impressed current (ICCP) and galvanic (GCP) cathodic protection systems and in understanding their long-term performance. Corrosion of reinforcing bar in concrete bridges is the primary cause of structural deterioration in high chloride environments such as coastal locations and colder climates where roads are deiced with salt. Over 40 pet of more than 500,000 bridges surveyed in the U.S. are in need of repair or rehabilitation. Cathodic protections is the most effective method of mitigating the effects of corrosion due to chloride contaminated concrete. While a young technology, consumable thermal sprayed zinc anodes (see Figure 1 for a schematic of the process) totaling over 40,000 m2 (430,00 ft2) have been installed on the Oregon coast, primarily on the Depoe Bay, Yaquina Bay, and Cape Creek bridges.

Type
Future of Microscopy: Ceramics, Composites, and Cement
Information
Microscopy and Microanalysis , Volume 5 , Issue S2: Proceedings: Microscopy & Microanalysis '99, Microscopy Society of America 57th Annual Meeting, Microbeam Analysis Society 33rd Annual Meeting, Portland, Oregon August 1-5, 1999 , August 1999 , pp. 826 - 827
Copyright
Copyright © Microscopy Society of America

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References

1.Covino, B.S. Jr., Bullard, S.J., Cramer, S.D., Holcomb, G.R., McGill, G.E., Cryer, C.B., Stoneman, A., and Carter, R.R., Interfacial Chemistry of Zinc Anodes for Reinforced Concrete Structures, Paper no. 97233, CORROSION/97, NACE International, 1997, 20 pp.Google Scholar
2.Bullard, S.J., Cramer, S.D., Covino, B.S. Jr., Holcomb, G.R., McGill, G.E., and Reis, R., Thermal-Sprayed Anodes for Cathodic Protection of Reinforced Concrete Bridges, in Concrete Under Sever Conditions 2-Environment and Loading, Proceedings of the Second International Conference on Concrete Under Severe Conditions, (Tromsø, Norway, June 14- 21,1998), CONSEC ‘98, Edited by Gjørv, O.E., Sakai, K., and Banthia, N., E&FN Spon, London, pp. 959-968, 1998.Google Scholar