PREVENTION OF STEEL CORROSION BY CONCRETE

A RESEARCH PROGRAM WAS UNDERTAKEN WITH THREE OBJECTIVES TO EXPLAIN (1) WHY CONCRETE AND CEMENT-MORTAR PROTECT STEEL FROM CORROSION, (2) WHAT EXPOSURE CONDITIONS LESSEN THIS PROTECTIVE CAPACITY, AND (3) HOW IS THE PROTECTIVE EFFECT PRESERVED. SOME OF THE RESULTS ARE: (1) CONCRETE PREVENTS CORROSION OF STEEL EVEN IN THE PRESENCE OF FREE OXYGEN AND CHLORIDES, AS LONG AS THE OXYGEN IS NOT TRAPPED AGAINST THE STEEL, (2) THE HYDROXYL IONS FROM THE CALCIUM HYDROXIDE OF PORTLAND CEMENT ARE CREDITED WITH THE FORMATION OF AN IRON OXIDE FILM ON THE STEEL SURFACE, AND THIS FILM TENDS ELECTRICALLY TO ISOLATE THE STEEL FROM ITS ENVIRONMENT, (3) EXCEPT WHERE CATHODIC INTERFERENCE EXISTS, CATHODE PROTECTION IS UNNECESSARY FOR A SOUND REINFORCED CONCRETE STRUCTURE, AND (4) BETWEEN APPLIED POTENTIALS FROM ABOUT +0.6 TO -1.OV (WITH RESPECT TO THE COPPER SULFATE ELECTRODE) CURRENT IS CONTROLLED BY POLARIZATION EFFECTS RATHER THAN BY RESISTANCE OF THE CONCRETE.

  • Supplemental Notes:
    • Vol 58, No 10, PP 1300-1306, 6 FIG, 3 REF
  • Authors:
    • BAILEY, J H
  • Publication Date: 1966-10

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  • Accession Number: 00212638
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 19 2003 12:00AM