Practical Considerations Pertaining to the Microscopical Determination of Air Void Characteristics of Hardened Concrete (ASTM C 457 Standard)

    Volume 12, Issue 1 (July 1990)

    ISSN: 0149-6123

    CODEN: CCAOAD

    Page Count: 9


    Pigeon, M
    Laval University, Sainte-Foy, Quebec

    Plante, P
    Laval University, Sainte-Foy, Quebec

    Gagné, R
    Laval University, Sainte-Foy, Quebec

    Pleau, R
    Laval University, Sainte-Foy, Quebec

    Abstract

    Many parameters affecting the quality of the air void characteristics measurement are reviewed and discussed. The difficulties more frequently encountered during the measurement process are described, and some simple rules are proposed in order to increase, as much as possible, the accuracy and reproducibility of the test. The influence of the sampling size is studied, and the variability of air content, specific surface, and spacing factor is estimated from a statistical analysis of about 600 different concrete mixtures. The influence of the operator's subjectivity is also investigated, and the effect produced by large air voids on the computation of the spacing factor is discussed.


    Paper ID: CCA10383J

    DOI: 10.1520/CCA10383J

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    Author
    Title Practical Considerations Pertaining to the Microscopical Determination of Air Void Characteristics of Hardened Concrete (ASTM C 457 Standard)
    Symposium , 0000-00-00
    Committee C09