PROTECTION OF REINFORCEMENT WITH CORROSION INHIBITORS, PHASE I

Costs due to corrosion of reinforcement in concrete caused by deicing salts has been estimated at up to $1 billion per year in the U.S. alone. For most situations, corrosion inhibiting admixtures offer significant advantages over other protection methods to delay initiation of corrosion of the service life of the structure. Two new prototype corrosion inhibiting chemicals were evaluated and compared with two commercial corrosion inhibiting admixtures as well as with a typical air-entrained control concrete. Corrosion testing consisted of weekly wetting (with salt solution) and drying cycles applied to slab type specimens and to both 2-in. (5.1-cm) and 3-in. (7.6-cm) diameter lollipop specimens. Some lollipop specimens were also "pre-cracked" prior to corrosion testing. Linear polarization techniques measured corrosion rates. Reinforcing bars were removed and visually examined at completion of testing. Other concrete material test results included compression strength, freeze-thaw resistance, and absorption. Compared with the control concrete and with the two commercial inhibitors, the new corrosion inhibiting chemicals produced significant improvement. After about 12 months of corrosion monitoring, "uncracked" specimens with the two prototype chemicals showed no sign of corrosion. "Pre-cracked" specimens, which contained the new chemicals, had very greatly reduced amounts of reinforcement corrosion.

• Record URL:
  • https://ntlrepository.blob.core.windows.net/lib/22000/22100/22138/PB99164113.pdf
• 
• Corporate Authors:

  University of Connecticut, Storrs

  Department of Civil and Environmental Engineering, 261 Glenbrook Road
  Storrs, CT  United States  06269-2037

  Connecticut Department of Transportation

  2800 Berlin Turnpike
  Newington, CT  United States  06131
• Authors:
  • Allyn, M
  • Frantz, G C
  • Stephens, J E
• Publication Date: 1998-11

Language

• English

Media Info

• Features: Appendices; Figures; Photos; References; Tables;
• Pagination: 189 p.

Subject/Index Terms

• TRT Terms: Admixtures; Corrosion; Corrosion protection; Corrosion resistant materials; Deicing chemicals; Laboratory tests; Performance evaluations; Reinforced concrete
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 00769441
• Record Type: Publication
• Report/Paper Numbers: JHR 98-266,, Final Report
• Files: NTL, TRIS, STATEDOT
• Created Date: Sep 14 1999 12:00AM