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ASTM C25-24

Standard Test Methods for Chemical Analysis of Limestone, Quicklime, and Hydrated Lime
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ASTM C25-24

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

PUBLISH DATE 2024
PAGES 40
ASTM C25-24

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:

  • Aluminum Oxide — Section 15
  • Available Lime Index — Section 28
  • Calcium and Magnesium Oxide:
    • Alternative EDTA Titration Method — Section 31
    • Calcium Carbonate Equivalent — Section 33
  • Calcium Oxide:
    • Gravimetric Method — Section 16
    • Volumetric Method — Section 17
  • Carbon Dioxide by Standard Method — Section 22
  • Combined Oxides of Iron and Aluminum — Section 12
  • Ferrous Iron — Section Appendix X5
  • Free Calcium Oxide — Section Appendix X6
  • Free Moisture in Hydrated Lime — Section 21
  • Free Moisture in Limestone — Section 20
  • Free Silica — Section 29
  • Insoluble Matter Including Silicon Dioxide:
    • Standard Method — Section 8
    • Optional Perchloric Acid Method — Section 9
  • Insoluble Matter Other Than Silicon Dioxide — Section 11
  • Loss on Ignition — Section 19
  • Magnesium Oxide — Section 18
  • Manganese:
    • Bismuthate Method — Section Appendix X4
    • Periodate (Photometric) Method — Section 27
  • pH Determination of Alkaline Earth Solutions — Section 34
  • Phosphorus:
    • Titrimetric Method — Section Appendix X3
    • Molybdovanadate Method — Section 26
  • Silicon Dioxide — Section 10
  • Strontium Oxide — Section Appendix X2
  • Sulfur Trioxide — Section 23
  • Total Carbon:
    • Direct Combustion-Thermal Conductivity Cell Method — Section 32
  • Total Carbon and Sulfur:
    • Combustion/Infrared Detection Method — Section 35
  • Total Iron:
    • Standard Method, Potassium Dichromate Titration — Section 13
    • Potassium Permanganate Titration Method — Section Appendix X1
    • Ortho-Phenanthroline, Photometric Method — Section 14
  • Total Sulfur:
    • Sodium Carbonate Fusion — Section 24
    • Combustion-Iodate Titration Method — Section 25
  • Unhydrated Oxides — Section 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.

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:

  • Aluminum Oxide — Section 15
  • Available Lime Index — Section 28
  • Calcium and Magnesium Oxide:
    • Alternative EDTA Titration Method — Section 31
  • Calcium Carbonate Equivalent — Section 33
  • Calcium Oxide:
    • Gravimetric Method — Section 16
    • Volumetric Method — Section 17
  • Carbon Dioxide by Standard Method — Section 22
  • Combined Oxides of Iron and Aluminum — Section 12
  • Ferrous Iron — Section Appendix X5
  • Free Calcium Oxide — Section Appendix X6
  • Free Moisture in Hydrated Lime — Section 21
  • Free Moisture in Limestone — Section 20
  • Free Silica — Section 29
  • Insoluble Matter Including Silicon Dioxide:
    • Standard Method — Section 8
    • Optional Perchloric Acid Method — Section 9
  • Insoluble Matter Other Than Silicon Dioxide — Section 11
  • Loss on Ignition — Section 19
  • Magnesium Oxide — Section 18
  • Manganese:
    • Bismuthate Method — Section Appendix X4
    • Periodate (Photometric) Method — Section 27
  • pH Determination of Alkaline Earth Solutions — Section 34
  • Phosphorus:
    • Titrimetric Method — Section Appendix X3
    • Molybdovanadate Method — Section 26
  • Silicon Dioxide — Section 10
  • Strontium Oxide — Section Appendix X2
  • Sulfur Trioxide — Section 23
  • Total Carbon:
    • Direct Combustion-Thermal Conductivity Cell Method — Section 32
  • Total Carbon and Sulfur:
    • Combustion/Infrared Detection Method — Section 35
  • Total Iron:
    • Standard Method, Potassium Dichromate Titration — Section 13
    • Potassium Permanganate Titration Method — Section Appendix X1
    • Ortho-Phenanthroline, Photometric Method — Section 14
  • Total Sulfur:
    • Sodium Carbonate Fusion — Section 24
    • Combustion-Iodate Titration Method — Section 25
  • Unhydrated Oxides — Section 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.

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.

SDO ASTM: ASTM International
Document Number C25
Publication Date June 1, 2024
Language en - English
Page Count 40
Revision Level 24
Supercedes
Committee C07.05
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