ASTM C25 - 17

    Standard Test Methods for Chemical Analysis of Limestone, Quicklime, and Hydrated Lime

    Active Standard ASTM C25 | Developed by Subcommittee: C07.05

    Book of Standards Volume: 04.01


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    Significance and Use

    4.1 These test methods provide accurate and reliable analytical procedures to determine the chemical constituents of limestone, quicklime, and hydrated lime (see Note 1). The percentages of specific constituents which determine a material's quality or fitness for use are of significance depending upon the purpose or end use of the material. Results obtained may be used in relation to specification requirements.

    4.2 Because quicklime and hydrated lime quickly absorb water and carbon dioxide from the air, precision and bias are extremely dependent upon precautions taken during sample preparation and analysis to minimize excessive exposure to ambient conditions.

    Note 1: These test methods can be applied to other calcareous materials if provisions are made to compensate for known interferences.

    1. Scope

    1.1 These test methods cover the chemical analysis of high-calcium and dolomitic limestone, quicklime, and hydrated lime. These test methods are classified as either standard (preferred) or alternative (optional).

    1.2 The standard test methods are those that employ classical gravimetric or volumetric analytical procedures and are typically those required for referee analyses where chemical specification requirements are an essential part of contractual agreement between buyer and seller.

    1.3 Alternative or optional test methods are provided for those who wish to use procedures shorter or more convenient than the standard methods for the routine determinations of certain constituents. Optional test methods may sometimes be preferred to the standard test methods, but frequently the use of modern and expensive instrumentation is indicated which may not be accessible to everyone. Therefore, the use of these test methods must be left to the discretion of each laboratory.

    1.4 The analytical procedures appear in the following order:

     

    Section

         Aluminum Oxide 

    15

         Available Lime Index 

    28

         Calcium and Magnesium Oxide:

          Alternative EDTA Titration Method 

    31

         Calcium Carbonate Equivalent 

    33

         Calcium Oxide:

          Gravimetric Method 

    16

          Volumetric Method 

    17

         Carbon Dioxide by Standard Method 

    22

         Combined Oxides of Iron and Aluminum 

    12

         Ferrous Iron 

    Appendix X5

         Free Calcium Oxide 

    Appendix X6

         Free Moisture in Hydrated Lime 

    21

         Free Moisture in Limestone 

    20

         Free Silica 

    29

         Insoluble Matter Including Silicon Dioxide:

          Standard Method 

    8

          Optional Perchloric Acid Method 

    9

         Insoluble Matter Other Than Silicon Dioxide 

    11

         Loss on Ignition 

    19

         Magnesium Oxide 

    18

         Manganese:

          Bismuthate Method 

    Appendix X4

          Periodate (Photometric) Method 

    27

         pH Determination of Alkaline Earth Solutions 

    34

         Phosphorus:

          Titrimetric Method 

    Appendix X3

          Molybdovanadate Method 

    26

         Silicon Dioxide 

    10

         Strontium Oxide 

    Appendix X2

         Sulfur Trioxide 

    23

         Total Carbon:

          Direct Combustion-Thermal Conductivity Cell
          Method

    32

         Total Carbon and Sulfur:

          Combustion/Infrared Detection Method 

    35

         Total Iron:

          Standard Method, Potassium Dichromate
          Titration 

    13

          Potassium Permanganate Titration Method 

    Appendix X1

          Ortho-Phenanthroline, Photometric Method 

    14

         Total Sulfur:

          Sodium Carbonate Fusion 

    24

          Combustion-Iodate Titration Method 

    25

          Unhydrated Oxides 

    30

    1.5 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. For specific precautionary statements, see 9.3, 10.2.1, 18.4.3, 31.6.4.2, X2.3.1, and X5.4.1.1.

    1.6 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

    C50 Practice for Sampling, Sample Preparation, Packaging, and Marking of Lime and Limestone Products

    C51 Terminology Relating to Lime and Limestone (as used by the Industry)

    C911 Specification for Quicklime, Hydrated Lime, and Limestone for Selected Chemical and Industrial Uses

    D1193 Specification for Reagent Water

    E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

    E50 Practices for Apparatus, Reagents, and Safety Considerations for Chemical Analysis of Metals, Ores, and Related Materials

    E70 Test Method for pH of Aqueous Solutions With the Glass Electrode

    E173 Practice for Conducting Interlaboratory Studies of Methods for Chemical Analysis of Metals

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

    E200 Practice for Preparation, Standardization, and Storage of Standard and Reagent Solutions for Chemical Analysis

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

    E832 Specification for Laboratory Filter Papers


    ICS Code

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

    UNSPSC Code

    UNSPSC Code 11111608(Limestone); 30111604(Hydrated 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/C0025-17

    Citation Format

    ASTM C25-17, Standard Test Methods for Chemical Analysis of Limestone, Quicklime, and Hydrated Lime, ASTM International, West Conshohocken, PA, 2017, www.astm.org

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