ASTM WK21221

    New Test Method for Using Temperature as a Relative Indication of Time of Set of Cementitious Mixtures

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    Developed by Subcommittee: C09.23 | Committee C09 | Contact Staff Manager



    WK21221

    1. Scope

    1.1 This test method is a quick method to get a relative comparison of time of set of cementitious materials under similar curing conditions by temperature measurements. This relative difference in time to achieve a fraction of the temperature rise is an indicator of relative time of setting. This test method is not meant to match or replace Test Method C403/C403M or any other penetration resistance method. It can be applied to compare a limited number of scenarios in which the microstructural aspects remain relatively constant, namely when comparing different binder combinations and admixture dosage rates. 1.2 Units--The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. WARNING--Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure.

    This will be useful it determining relative differences in hydration associated with temperature rise. These differences in temperature rise are related to strength gain and setting. This test is faster, easier to run, and less labor intensive then typical strength and setting tests. It is most useful in cases in which the investigator is trying to determine the relative difference of changing mixture design parameters. This is most useful to concrete producers or suppliers to concrete producers technical services.


    Keywords

    fraction of temperature rise time; temperature measurement; setting time; early age hydration

    The title and scope are in draft form and are under development within this ASTM Committee.

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    Work Item Status

    Date Initiated:
    09-10-2008

    Technical Contact:
    Mark Niemuth

    Status:
    Draft Under Development