ASTM C265 - 08

    Standard Test Method for Water-Extractable Sulfate in Hydrated Hydraulic Cement Mortar

    Active Standard ASTM C265 | Developed by Subcommittee: C01.28

    Book of Standards Volume: 04.01


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    ASTM C265

    Significance and Use

    Excess soluble sulfate ions in hardened cement can result in reduced durability. This test method is intended to show whether calcium sulfate has been used in cement in such amount to leave excess soluble sulfate in hardened mortar. The test method is used to establish compliance in Specification C 595 for those cements in which optimized SO3 exceeds the table limit. This test method also can provide useful information on other hydraulic cements, such as those specified in Specifications C 150 and C 1157.

    When this test method is used in conjunction with Test Method C 563, use the appropriate age of test specimens (24 h, 3 days, or 7 days) to coincide with the age of specimens used in Test Method C 563.

    1. Scope

    1.1 This test method covers the measurement of water-extractable SO3 in hardened hydraulic cement mortar. This measurement is assumed to represent unreacted, available sulfate remaining in the mortar.

    1.1.1 WarningFresh hydraulic cementious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure.

    1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

    1.3 Values in SI units were obtained by measurement in SI units or by appropriate conversion using the Rules for Conversion and Rounding given in IEEE/ASTM SI-10 Standard of measurements made in other units.

    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.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    C109/C109M Test Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-in. or [50-mm] Cube Specimens)

    C114 Test Methods for Chemical Analysis of Hydraulic Cement

    C150 Specification for Portland Cement

    C219 Terminology Relating to Hydraulic Cement

    C305 Practice for Mechanical Mixing of Hydraulic Cement Pastes and Mortars of Plastic Consistency

    C563 Test Method for Approximation of Optimum SO3 in Hydraulic Cement Using Compressive Strength

    C595 Specification for Blended Hydraulic Cements

    C778 Specification for Sand

    C1157 Performance Specification for Hydraulic Cement

    D1193 Specification for Reagent Water

    E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves


    UNSPSC Code

    UNSPSC Code 30111504(Mortars)


    DOI: 10.1520/C0265-08

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