ASTM C123 / C123M - 12

    Standard Test Method for Lightweight Particles in Aggregate

    Active Standard ASTM C123 / C123M | Developed by Subcommittee: C09.20

    Book of Standards Volume: 04.02


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    Significance and Use

    This test method is used to determine conformance with provisions of Specification C33 pertaining to the amount of lightweight material in fine and coarse aggregates. A heavy liquid with a specific gravity of 2.0 is used to separate particles which may be classified as coal or lignite. Heavier liquids are to be used to check the percentages of other lightweight particles such as chert and shale having a specific gravity less than 2.40.

    The test method is useful in identifying porous aggregate particles in research activities or in petrographic analyses.

    1. Scope

    1.1 This test method covers the determination of the percentage of lightweight particles in aggregate by means of sink-float separation in a heavy liquid of suitable specific gravity.

    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 non-conformance with the standard. Some values have only SI units because the inch-pound equivalents are not used in the practice.

    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 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the 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. For a specific hazard statement, see 6.1.4.


    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

    C33 Specification for Concrete Aggregates

    C125 Terminology Relating to Concrete and Concrete Aggregates

    C127 Test Method for Density, Relative Density (Specific Gravity), and Absorption of Coarse Aggregate

    C128 Test Method for Density, Relative Density (Specific Gravity), and Absorption of Fine Aggregate

    C702 Practice for Reducing Samples of Aggregate to Testing Size

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

    D75 Practice for Sampling Aggregates

    D3665 Practice for Random Sampling of Construction Materials

    E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves

    E100 Specification for ASTM Hydrometers


    ICS Code

    ICS Number Code 91.100.30 (Concrete and concrete products)

    UNSPSC Code

    UNSPSC Code 30111800(Aggregates)


    Referencing This Standard

    DOI: 10.1520/C0123_C0123M-12

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM C123 / C123M-12, Standard Test Method for Lightweight Particles in Aggregate, ASTM International, West Conshohocken, PA, 2012, www.astm.org

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