ASTM WK23967

    New Practice for Evaluating Early Hydration of Hydraulic Cementitious Mixtures Using Thermal Measurements

    (What is a Work Item?)

    Developed by Subcommittee: C09.48 | Committee C09 | Contact Staff Manager



    WK23967

    1. Scope

    1.1 This practice describes the apparatus and procedure for evaluating relative differences in early hydration of hydraulic cementitious mixtures such as paste, mortar, or concrete, including those containing chemical admixtures, various supplementary cementitious materials (SCMs), and other finely divided materials, by measuring the temperature history of a specimen. 1.2 Calorimetry is the measurement of heat lost or gained during a chemical reaction such as cement hydration; calorimetric measurements as a function of time can be used to describe and evaluate hydration and related early-age property development. Calorimetry may be performed under isothermal conditions (as described in Practice C1679) or under adiabatic or semi-adiabatic conditions. This practice cannot be described as calorimetry because no attempt is made to measure the heat evolved from test specimens due to hydration, but it can in many cases be used for similar evaluations as calorimetry. Variables that should be considered in the application of this practice are discussed in the Appendix. 1.3 Units The values stated in either SI units or inch-pound units shall be regarded separately as standard. The units stated in each system may not be exact equivalents; therefore, each system must be used independently of the other, without combining in any way. Some values have only SI units because the inch pound equivalents are not used in practice. 1.4 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.

    This practice can be used as a research and quality control tool by concrete producers, contractors, materials suppliers, and researchers.


    Keywords

    cement-admixture interactions; thermal measurement testing; hydration; thermal profiles; setting; sulfate balance

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

    Citing ASTM Standards
    Back to Top
    Work Item Status

    Date Initiated:
    04-26-2009

    Technical Contact:
    Tim Cost

    Status:
    Draft Under Development