DETERMINATION OF A NITRITE-BASED CORROSION INHIBITOR IN PLASTIC AND HARDENED CONCRETE

An established method for reducing the corrosive action of chloride on reinforcing steel in concrete is DCI corrosion inhibitor, a 30 percent solution of calcium nitrite. Certain regulatory agencies require monitoring the admixed concrete to ensure that the specified amount of corrosion inhibitor has been added. This paper describes a field test for verifying the presence of nitrite in plastic concrete and a laboratory procedure for measuring the addition rate of a nitrite-based corrosion inhibitor for hardened concrete. Researchers found that the concrete mix design does not generally affect the extraction of the nitrite from the concrete; however, to obtain an accurate estimation of the admixed nitrite, where less than 85 percent recovery is achieved, the amount of nitrite extracted from the test sample should be compared to that of a reference concrete having the same mix design.

Language

  • English

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Filing Info

  • Accession Number: 00715287
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 1 1996 12:00AM