ASTM WK34917

    Revision of C856 - 11 Standard Practice for Petrographic Examination of Hardened Concrete

    (What is a Work Item?)

    Active Standard: C856 - 14

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



    WK34917

    1. Rationale

    The current Annex in C856 regarding using uranyl acetate to identify alkali-silica reactivity (ASR) in hardened concrete is mandatory information. Since uranyl acetate test is not an intrinsic part of petrographic examination and it is stated in section A1.1.2 The test is ancillary to more definitive petrographic examination and physical tests for determining concrete expansion. it should not be mandatory information for this method. In addition, uranyl acetate is toxic and harmful to the environment, the use of the test should be limited. Therefore, this information should be used as reference and is non-mandatory.


    Keywords

    aggregates; air voids; alkali-silica reaction; analysis; deterioration; examination; fire effects; hardened concrete; microscopy; paste; petrographic; secondary deposits; Fire testing--building materials; Hardened concrete; Microscopic examination--concrete; Petrographic analysis; Stereomicroscopy; Visual examination--concrete; Alkali reactivity;
    Citing ASTM Standards
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    Work Item Status

    Date Initiated:
    10-07-2011

    Technical Contact:
    Derek Cong

    Item:
    012

    Ballot:
    C09 (14-02)

    Status:
    Ballot Item Approved as C856-2014 and Pending Publication

    Item:
    034

    Ballot:
    C09 (13-03)

    Status:
    Ballot Item Approved as C856-2013 and Pending Publication

    Item:
    035

    Ballot:
    C09 (13-03)

    Status:
    Ballot Item Approved as C856-2013 and Pending Publication