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    ASTM C1324 - 20a

    Standard Test Method for Examination and Analysis of Hardened Masonry Mortar

    Active Standard ASTM C1324 | Developed by Subcommittee: C12.02

    Book of Standards Volume: 04.05

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    Significance and Use

    4.1 This test method provides procedures for petrographic examination and chemical analysis of mortar for components of masonry mortar. These components may include portland cement, hydrated calcitic or dolomitic lime, masonry cement, aggregates, and air.

    4.2 The test method consists of procedures and sub-procedures, each requiring a substantial degree of petrographic and chemical skills and relatively elaborate instrumentation.

    4.3 The chemical data considered together with results of petrographic examination of a mortar provide for calculation of component proportions and thus allow a determination of mortar composition as represented by Types M, N, S, and O in Table 1 (Proportion Specification Requirements) of Specification C270.

    4.4 Failure of a mortar to have the composition of any type as defined in Table 1 of Specification C270 does not necessarily mean that the mortar does not meet the requirements of Specification C270. The mortar may meet the alternative requirements of Table 2 (Property Specification Requirements) of Specification C270.

    4.5 The maleic acid method of analysis is not applicable for the analysis of mortar because it is greatly influenced by carbonation and does not provide for the determination of calcium.

    1. Scope

    1.1 This test method covers procedures for petrographic examination and chemical analysis of samples of masonry mortars. Based upon such examination and analysis, proportions of components in masonry mortars can be determined.

    Note 1: This method is also applicable to hydraulic cement-based stucco and plaster. Some historic mortars may contain non-resolvable constituents that may interfere. However, significant information may be obtained by petrographic examinations.

    1.2 Interpretations and calculations of chemical results are dependent upon results of the petrographic examination. The use of the chemical results alone is contrary to the requirements of this test method.

    1.3 Procedures for sampling, petrographic examination, chemical analysis, and calculations of component proportions are given in the following sections:





    Petrographic examination


    Chemical analysis


    Mortar proportion calculations




    1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

    1.5 The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.

    1.6 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.

    1.7 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

    C114 Test Methods for Chemical Analysis of Hydraulic Cement

    C125 Terminology Relating to Concrete and Concrete Aggregates

    C144 Specification for Aggregate for Masonry Mortar

    C270 Specification for Mortar for Unit Masonry

    C295/C295M Guide for Petrographic Examination of Aggregates for Concrete

    C457/C457M Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete

    C823/C823M Practice for Examination and Sampling of Hardened Concrete in Constructions

    C856/C856M Practice for Petrographic Examination of Hardened Concrete

    C926 Specification for Application of Portland Cement-Based Plaster

    C1084 Test Method for Portland-Cement Content of Hardened Hydraulic-Cement Concrete

    C1180 Terminology of Mortar and Grout for Unit Masonry

    D1193 Specification for Reagent Water

    ICS Code

    ICS Number Code 71.040.40 (Chemical analysis); 91.100.10 (Cement. Gypsum. Lime. Mortar)

    UNSPSC Code

    UNSPSC Code 30111504(Mortars)

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

    DOI: 10.1520/C1324-20A

    Citation Format

    ASTM C1324-20a, Standard Test Method for Examination and Analysis of Hardened Masonry Mortar, ASTM International, West Conshohocken, PA, 2020, www.astm.org

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