MONITORING THE INFLUENCE OF WATER AND IONIC INGRESS ON COVER-ZONE CONCRETE SUBJECTED TO REPEATED ABSORPTION

The author presents data from a test program that examines water and ionic movement in the cover region of reinforced concrete under a cyclic wetting and drying regime. Experiments were performed over an 18-month period on slabs containing various cementitious materials. The samples were exposed to water and chloride solution. Water and ionic ingress through the cover zone was monitored via small conductivity probes embedded within the surface of 50-mm concrete specimens. The conductivity profiles derived from the experiments highlight the influence of repeated absorption on water and ionic ingress, hydration, pozzolanic activity, and chloride binding. A simple electrical model represents the influence of pore fluid and microstructure on conductivity. Conventional methods of examination were also employed to corroborate conductivity data and included cumulative volumetric gain, coring for carbonation and chloride ingress, and drillings for chloride concentration profiles.

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  • Corporate Authors:

    American Society for Testing and Materials

    100 Barr Harbor Drive, P.O. Box C700
    West Conshohocken, PA  United States  19428-2957
  • Authors:
    • McCarter, W J
  • Publication Date: 1996-6

Language

  • English

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Filing Info

  • Accession Number: 00726972
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 26 1996 12:00AM