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    ASTM D8378 / D8378M - 21

    Standard Test Method for Potential Expansion of Steel Slag from Hydration Reactions by Autoclave

    Active Standard ASTM D8378 / D8378M | Developed by Subcommittee: D04.51

    Book of Standards Volume: 04.03


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    Significance and Use

    4.1 This test method provides a procedure for determining the compliance of steel slags and other materials with specifications or applications that limit permissible expansion of base and subbase aggregates containing components subject to hydration.

    4.2 This test method can also be used to evaluate the effectiveness of aging or other treatments for reducing the expansive potential of such materials.

    4.3 This test method is utilized for dense graded materials passing a 25.0 mm (1 in.) sieve. If it is desired to investigate materials larger than a 25.0 mm (1 in.) sieve, Indiana Test Method ITM 219 should be considered.

    4.4 Test results have not been correlated with field performance, and values obtained do not necessarily indicate expansion that may occur in service conditions. The various methods will provide different numerical results due to differences in severity of the procedures.

    1. Scope

    1.1 This test method covers the determination of potential volume expansion of steel slags that contain components susceptible to hydration and consequent volume increase, such as the free calcium and magnesium oxides.

    1.1.1 This method is based upon the Cement Autoclave procedure, Test Method C151/C151M, and the California Bearing Ratio procedure, Test Method D1883. This is an aggressive test that can detect both calcium and magnesium expansion potentials. The procedure is also a rapid method typically completed within 24 h.

    1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.

    Note 1: Sieve size is identified by its standard designation in Specification E11. The alternative designation given in parentheses is for information only and does not represent a different standard sieve size.

    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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

    1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


    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

    C29/C29M Test Method for Bulk Density (Unit Weight) and Voids in Aggregate

    C151/C151M Test Method for Autoclave Expansion of Hydraulic Cement

    C702/C702M Practice for Reducing Samples of Aggregate to Testing Size

    C1005 Specification for Reference Masses and Devices for Determining Mass and Volume for Use in Physical Testing of Hydraulic Cements

    D75/D75M Practice for Sampling Aggregates

    D1883 Test Method for California Bearing Ratio (CBR) of Laboratory-Compacted Soils

    D4792/D4792M Test Method for Potential Expansion of Aggregates from Hydration Reactions

    E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves


    Referencing This Standard
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    DOI: 10.1520/D8378_D8378M-21

    Citation Format

    ASTM D8378 / D8378M-21, Standard Test Method for Potential Expansion of Steel Slag from Hydration Reactions by Autoclave, ASTM International, West Conshohocken, PA, 2021, www.astm.org

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