ASTM WK71744

    Revision of C457 / C457M - 16 Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete

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    Active Standard: C457 / C457M - 16

    Developed by Subcommittee: C09.65 | Committee C09 | Contact Staff Manager



    air content; air void parameters of hardened concrete; area-prepared surface required; average chord-length of voids; determination of air-void parameters; entrained void; entrapped void; grits for lapping hardened concrete; index point; lapping; length of traverse required; linear-traverse method; microscopical; number of points required; paste-air ratio; paste-air ratio modification; paste content; point-count method (modified); specimen preparation for microscopical analysis; spacing factor; specific surface; void frequency; water void ;;


    Within the current document, there is a figure for estimating the spacing factor (Figure 4). It was discussed in the task group that this appears to be historical and no one is using the figure, instead always calculating the value given the provided equations. As such, it was decided to ballot for the removal of this figure, which includes reference to the figure in the text.

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    Work Item Status

    Date Initiated:

    Technical Contact:
    Jamison Langdon

    Draft Under Development