ASTM C563 - 17

    Standard Guide for Approximation of Optimum SO3 in Hydraulic Cement

    Active Standard ASTM C563 | Developed by Subcommittee: C01.28

    Book of Standards Volume: 04.01


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    Significance and Use

    3.1 The purpose of this guide is to estimate the SO3 content for a hydraulic cement that gives maximum performance. The value obtained is one way to establish an appropriate level of sulfate in the manufacture of cements specified in Specifications C150, C595, and C1157.

    3.2 The SO3 content of a cement giving maximum performance is different at different ages, with different performance criteria and with different materials such supplementary cementitious materials and chemical admixtures. A manufacturer can choose the performance criteriato determine optimum SO3 content. This optimum SO3 content may be a compromise between different ages and different performance criteria.

    Note 1: Typically, the optimum SO3 content is higher the later the age.

    3.3 This guide indicates optimum SO3 content for cement in mortar made and cured at a standard temperature of 23.0 ± 2.0°C (73.5 ± 3.5°F). The optimum SO3 increases with increasing temperature and may increase when water-reducing admixtures are used.

    3.4 It should not be assumed that the optimum SO3 estimated in this guide is the same SO3 content for optimum performance of a concrete prepared from the cement.

    3.5 The guide is applicable to cements specified in Specifications C150, C595, and C1157.

    1. Scope

    1.1 This guide describes the determination of approximate optimum SO3 for maximum performance as a result of substituting calcium sulfate for a portion of the cement.

    1.2 This guide refers to the sulfur trioxide (SO3) content of the cement only. Slag cements and occasionally other hydraulic cements can contain sulfide or other forms of sulfur. The determination of SO3 content by rapid methods may include these other forms, and may therefore produce a significant error. If a significant error occurs, analyze the cement for SO3 content using the reference test method of Test Methods C114 for sulfur trioxide.

    1.3 Values stated as SI units are to be regarded as standard.

    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

    C39/C39M Test Method for Compressive Strength of Cylindrical Concrete Specimens

    C78 Test Method for Flexural Strength of Concrete (Using Simple Beam with Third-Point Loading)

    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

    C192 Practice for Making and Curing Concrete Test Specimens in the Laboratory

    C204 Test Methods for Fineness of Hydraulic Cement by Air-Permeability Apparatus

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

    C430 Test Method for Fineness of Hydraulic Cement by the 45-m (No. 325) Sieve

    C465 Specification for Processing Additions for Use in the Manufacture of Hydraulic Cements

    C471M Test Methods for Chemical Analysis of Gypsum and Gypsum Products (Metric)

    C595 Specification for Blended Hydraulic Cements

    C596 Test Method for Drying Shrinkage of Mortar Containing Hydraulic Cement

    C1157 Performance Specification for Hydraulic Cement

    C1437 Test Method for Flow of Hydraulic Cement Mortar

    C1702 Test Method for Measurement of Heat of Hydration of Hydraulic Cementitious Materials Using Isothermal Conduction Calorimetry


    ICS Code

    ICS Number Code 91.100.10 (Cement. Gypsum. Lime. Mortar)

    UNSPSC Code

    UNSPSC Code 30111600(Cement and lime)


    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/C0563-17

    Citation Format

    ASTM C563-17, Standard Guide for Approximation of Optimum SO3 in Hydraulic Cement, ASTM International, West Conshohocken, PA, 2017, www.astm.org

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