EFFECT OF CALCIUM NITRITE ON THE PROPERTIES OF CONCRETE USED IN BRIDGE DECKS. FINAL REPORT

Chloride-induced corrosion of the reinforcing steel in bridge decks can impair its structural integrity and cause spalling, which reduces the ride quality of the deck. One system to prevent corrosion involves the use of corrosion inhibitors in freshly mixed concrete. This study evaluates the properties of field concretes containing the inhibitor, DCI (calcium nitrite) and assesses their field performance over a 3-year period. Comparative tests were made on a two-span bridge, one span of which had epoxy-coated bars with regular concrete and the other uncoated bars with concretes containing DCI. The results indicate that the properties of the hardened concretes containing DCI were satisfactory and similar to those of the regular concretes. A conclusion on the effectiveness of DCI was not reached because of the limited time available; consequently, a follow-up evaluation is recommended. At present, the continued use of epoxy-coated reinforcing steel is recommended.

Language

  • English

Media Info

  • Features: References; Tables;
  • Pagination: 20 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00625074
  • Record Type: Publication
  • Report/Paper Numbers: FHWA/VA-93-R4, VTRC 93-R4
  • Contract Numbers: 2792-055-940
  • Files: NTL, TRIS, USDOT, STATEDOT
  • Created Date: Oct 14 1996 12:00AM