CRACK COUNTS IN AIR-ENTRAINED AND NON-AIR-ENTRAINED CONCRETE SUBJECTED TO ACCELERATED AND FOG-ROOM CURING

Concrete cured by the accelerated steam method at atmospheric pressure often loses strength at later ages. One factor that may contribute to this loss of potential strength is microcracking caused by differential stress within the material. Because entrained air voids help to protect concrete in other circumstances, the authors postulated that entrained air may similarly benefit concrete subjected to accelerated steam curing. Specimens of air-entrained and non-air-entrained concrete were subjected to fog-room curing and to accelerated steam curing. Crack counts at day 1 and day 28 were comparable for air-entrained and non-air-entrained concrete. At day 28 for fog-cured concrete, the crack count was higher than that of the steam-cured concrete, regardless of air entrainment. Clearly, the data suggest that entrained air does not reduce internal stresses and resulting microcracking. Also of note, the samples that had gained strength most rapidly were found to have the highest crack count, regardless of air entrainment.

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  • Corporate Authors:

    American Society for Testing and Materials (ASTM)

    100 Barr Harbor Drive, P.O. Box C700
    West Conshohocken, PA  United States  19428-2957
  • Authors:
    • Gillott, J E
    • Czarnecki, B
  • Publication Date: 1994-12

Language

  • English

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Filing Info

  • Accession Number: 00675515
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 13 1995 12:00AM