HUMECTANTS TO AUGMENT CURRENT FROM METALLIZED ZINC CATHODIC PROTECTION SYSTEMS ON CONCRETE

Cathodic protection (CP) systems using thermal-sprayed zinc anodes are employed to mitigate the corrosion process in reinforced concrete structures. However, the performance of the anodes is improved by moisture at the anode-concrete interface. Research was conducted to investigate the effect of hydrophillic chemical additives, humectants, on the electrical performance and service life of zinc anodes. Lithium bromide and lithium nitrate were identified as feasible humectants with lithium bromide performing better under galvanic CP and lithium nitrate performing better under impressed current CP. Both humectants improved the electrical operating characteristics of the anode and increase the service life by up to three years.

• Record URL:
  http://www.oregon.gov/ODOT/Programs/ResearchDocuments/Humectants.pdf
• 
• Corporate Authors:

  Oregon Department of Transportation

  Research Section, 200 Hawthorne Avenue, SE, Suite B-240
  Salem, OR  United States  97301-5192

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Holcomb, G R
  • Covino Jr, B S
  • Cramer, S D
  • Russell, J H
  • Bullard, S J
  • Collins, W K
  • Bennett, J E
  • Soltesz, S M
  • Laylor, H M
• Publication Date: 2002-12

Language

• English

Media Info

• Features: Appendices; Figures; Tables;
• Pagination: 131 p.

Subject/Index Terms

• TRT Terms: Anodes; Cathodic protection; Concrete structures; Corrosion; Electric current; Lithium compounds; Reinforced concrete; Service life; Zinc
• Uncontrolled Terms: Humectants
• Subject Areas: Design; Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 00936883
• Record Type: Publication
• Report/Paper Numbers: FHWA-OR-RD-03-08,, Final Report
• Contract Numbers: SPR 384
• Files: TRIS, ATRI, USDOT, STATEDOT
• Created Date: Jan 27 2003 12:00AM