ASTM WK31992

    Revision of C172 / C172M - 10 Standard Practice for Sampling Freshly Mixed Concrete

    (What is a Work Item?)

    Active Standard: C172 / C172M - 14

    Developed by Subcommittee: C09.60 | Committee C09 | Contact Staff Manager



    WK31992

    1. Rationale

    : C172 currently includes fresh sampling techniques for only batch mixing equipment. A second type of mixer that is widely in use is a continuous mixer as described in C685. This mixer is usually associated with volumetric batching (proportioning) in what has come to be called mobile mixers or volumetric mixers. C172 provides no guidance on sampling procedures for concrete produced by a continuous mixer. The proposed changes and additions to ASTM C172 provide for the required sampling to take place by methods and within a time frame consistent with the equipment used to make this concrete.


    Keywords

    air content; batch; composite sample; concrete; slump; temperature; wet-sieving; Sampling concrete/mortar/aggregates; Ready-mixed concrete; Wet sieving;
    Citing ASTM Standards
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    Work Item Status

    Date Initiated:
    02-07-2011

    Technical Contact:
    Darrell Elliot

    Item:
    004

    Ballot:
    COS (14-01)

    Status:
    Ballot Item Approved as C172/C172M-2014 and Pending Publication