ASTM D4791 - 19

    Standard Test Method for Flat Particles, Elongated Particles, or Flat and Elongated Particles in Coarse Aggregate

    Active Standard ASTM D4791 | Developed by Subcommittee: D04.51

    Book of Standards Volume: 04.03


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    Significance and Use

    5.1 The particles shape of course aggregates influences the properties of some construction materials and may affect their placement and consolidation.

    5.2 This test method provides a means for checking compliance with specifications that limit such particles or to determine the relative shape characteristics of coarse aggregates.

    1. Scope

    1.1 This test method covers the determination of the percentages of flat particles, elongated particles, or flat and elongated particles in coarse aggregates. Two procedures, Method A and Method B, are presented in this standard. Method A is a reflection of the original procedure as developed prior to Superpave and is intended for all non-Superpave applications. Method B is a comparison of the maximum particle dimension to the minimum particle dimension and is intended for use with Superpave specifications.

    1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

    1.2.1 Exception (regarding sieves, per Specification E11)—The values stated in SI units shall be considered standard for the dimensions of the wire cloth openings and the diameter of the wires used in the wire cloth. When sieve mesh sizes are referenced, the alternate inch-pound designations are provided for information purposes and enclosed in parenthesis.

    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

    C136/C136M Test Method for Sieve Analysis of Fine and Coarse Aggregates

    C670 Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials

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

    D75/D75M Practice for Sampling Aggregates

    E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves

    E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods

    E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method


    UNSPSC Code

    UNSPSC Code 30111800(Aggregates); 30121700(Road and railroad construction materials)


    Referencing This Standard
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    DOI: 10.1520/D4791-19

    Citation Format

    ASTM D4791-19, Standard Test Method for Flat Particles, Elongated Particles, or Flat and Elongated Particles in Coarse Aggregate, ASTM International, West Conshohocken, PA, 2019, www.astm.org

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