ASTM WK67245

    New Test Methods for Measuring the Chemical Reactivity of Supplementary Cementitious Materials by Isothermal Calorimetry and Bound Water Measurements

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    Developed by Subcommittee: C09.24 | Committee C09 | Contact Staff Manager


    1. Scope

    1.1 These test methods are used to assess the chemical reactivity of a supplementary cementitious material (SCM) as determined by measurements of cumulative heat release or bound water content of hydrated pastes composed of the water, SCM, calcium hydroxide, calcium carbonate, potassium sulfate, and potassium hydroxide cured at 40C for three and seven days. 1.1.1 These test methods do not distinguish between hydraulic and pozzolanic reactivity. 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. When these test methods refer to combined-unit standards, the selection of the measurement systems is at the users discretion. 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.)


    supplementary cementitious materials; hydraulic reactivity; pozzolanic reactivity; heat of hydration; chemically bound water


    The proposed test methods are aimed at providing a direct measure of chemical reactivity of SCMs, thus providing a valuable tool to distinguish SCMs from other materials that do not react chemically in cementitious mixtures. The bound water test provides a mean to determine the amount of chemically bound water in a mixture of an SCM and a simulated cement paste pore solution via gravimetry. The amount of chemically bound water is an indication of the reactivity of a given SCM. Similarly, using mixture of an SCM and a simulated cement paste pore solution, the isothermal calorimetry test measures the cumulative heat evolution of the mixture, which is also a measure of the reactivity of the SCM. The purpose of these two test methods is to provide more reliable indicators of hydraulic or pozzolanic reactivity.

    Citing ASTM Standards
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    Work Item Status

    Date Initiated:

    Technical Contact:
    R. Doug Hooton