THE EFFECT OF MOLD SIZE AND MOLD MATERIAL ON COMPRESSIVE STRENGTH MEASUREMENT USING CONCRETE CYLINDERS

This article describes recent studies at the University of Calgary in which the influence of specimen size on the measured strength of plain and fly ash concretes were examined. Fourteen concretes were cast, with and without air entrainment and fly ash, using various sizes of cylindrical mold made from different materials. The cylindrical specimens were cured in the standard manner and tested for compressive strength, most often at an age of 28 days. The measured strengths of the specimens ranged from 30 to 50 MPa. The five types of molds included: 150-mm diameter cardboard and plastic molds, 100-mm diameter plastic molds, and 75-mm diameter cardboard and plastic molds. The effect of mold material and diameter on the magnitude of measured strength was also investigated, but no distinct trends were observed. Differences in observed strengths due to type and size of mold were influenced by the type of concrete tested and the initial storage procedure used during the first 24 hours of storage. Differences in 28-day strengths among specimens are reported, which can be traced most often to differences in moisture loss during the first 24 hours of storage.

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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:
    • Day, R L
  • Publication Date: 1994-12

Language

  • English

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Filing Info

  • Accession Number: 00675521
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 15 1995 12:00AM