A simple inorganic additive for concrete, the calcium nitrite corrosion inhibitor called Darex, it is claimed, will extend the life of reinforced concrete structures such as bridge decks. The corrosion inhibitor works by covering the anodic loci of the steel reinforcement bars with a thin coating of what is believed to be gamma fernic oxide, or iron oxidized to its highest oxidation state. It is the first chemical bonding protection process for reinforcing rods in concrete. The use of calcium nitrite will add about $3.50 to $5.00 to the cost of concrete, when mixed 2 to 5% by weight (a 2 to 3% increase per cubic yard). The product, which is marketed by W.B. Grace and Company, has been in use in Japan for the past 10 years.

  • Corporate Authors:

    American Chemical Society

    1155 16th Street, NW
    Washington, DC  United States  20036
  • Publication Date: 1979-7-9

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00196425
  • Record Type: Publication
  • Report/Paper Numbers: CENEAR57(28) 1-68
  • Files: TRIS
  • Created Date: Sep 15 1979 12:00AM