ASTM WK35165

    Work Item: ASTM WK35165 - Revision of C1012 / C1012M - 10 Standard Test Method for Length Change of Hydraulic-Cement Mortars Exposed to a Sulfate Solution

    (What is a Work Item?)

    Active Standard: C1012 / C1012M - 13

    Developed by Subcommittee: C01.29 | Committee C01 | Contact Staff Manager



    1. Rationale

    The current test method requires covering the molds (making watertight) and placing in a curing tank. Often the samples leak and water seeps into the mold making the specimen questionable as to there suitability for continuing the test. Additional test cubes and bars are often required to continue when this happens, contributing to extra man hours, test delay and expense. Conducting an informal survey, it was found that many labs deviate form the procedure as outlined in the C1012. Some labs place the molds in sealed plastic bags and then submerge in the water bath, other labs place the molded specimens elevated in a water bath on raisers, then place in an oven at the appropriate temperature. It is the ladder method that we are proposing as method B Please note that this change to the C1012 is to allow only an optional method (Method B) for accelerating the specimens to the required strength prior to exposing the bars to the sulfate solution. The advantages to Method B are: No rejected samples do to the infusion of water while in the water bath Saves time in not having to prepare the cubes and bar molds making watertight Saves time in cleaning up the molds from not making them watertight


    Keywords

    acceptability; expansion; fly ash; mortars; pozzolans; precision; search report; slag; sulfate attack; sulfate-resisting cements; tests; Cement mortars; Change in length; Hydraulic cement concrete; Sulfate resistance; Volumetric measurement--cement/concrete ;
    Citing ASTM Standards
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    Work Item Status

    Date Initiated:
    11-09-2011

    Technical Contact:
    Gary Knight

    Item:
    004

    Ballot:
    COS1312

    Status:
    Ballot Item Approved as C1012/C1012M-2013 and Pending Publication