ASTM WK32478

    Revision of C457 / C457M - 10a Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete

    (What is a Work Item?)

    Active Standard: C457 / C457M - 12

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


    1. Rationale

    The apparatus and procedure sections of the document are antiquated relative to current equipment commonly being used. The sections will be rewritten to generalize the text to allow both manual systems and motor driven/computer controlled systems. Consideration will also be given to automated methods that have been developed to perform the C457 analysis.


    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); sample preparation for microscopical analysis; spacing factor; specific surface; void frequency; water void; Air content--concrete; Air voids; Hardened concrete; Linear traverse (Rosiwal) method; Microscopic examination--concrete; Modified point-count method; Petrographic analysis; Pore structure; Spacing factor; Surface analysis--concrete;
    Citing ASTM Standards
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    Work Item Status

    Date Initiated:

    Technical Contact:
    Nick Scaglione

    Draft Under Development