ASTM C25-19e1

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

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.
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...

General Information

• Status: Published
• Publication Date: 30-Apr-2019
• ICS: 91.100.10 - Cement. Gypsum. Lime. Mortar
• Technical Committee: C07 - Lime and Limestone
• Drafting Committee: C07.05 - Chemical Tests

Relations

• Replaces: ASTM C25-19 - Standard Test Methods for Chemical Analysis of Limestone, Quicklime, and Hydrated Lime
• Effective Date: 01-May-2019
• Referred By: ASTM C1797-23a - Standard Specification for Ground Calcium Carbonate and Aggregate Mineral Fillers for use in Hydraulic Cement Concrete
• Effective Date: 01-May-2019
• Referred By: ASTM C1097-19 - Standard Specification for Hydrated Lime for Use in Asphalt Cement or Bituminous Paving Mixtures
• Effective Date: 01-May-2019
• Referred By: ASTM C1529-19 - Standard Specification for Quicklime, Hydrated Lime, and Limestone for Environmental Uses
• Effective Date: 01-May-2019
• Referred By: ASTM D5050-08(2023) - Standard Guide for Commercial Use of Lime Kiln Dusts and Portland Cement Kiln Dusts
• Effective Date: 01-May-2019
• Referred By: ASTM C706-19 - Standard Specification for Limestone for Animal Feed Use
• Effective Date: 01-May-2019
• Referred By: ASTM C593-19 - Standard Specification for Fly Ash and Other Pozzolans for Use With Lime for Soil Stabilization
• Effective Date: 01-May-2019
• Referred By: ASTM C1318-15a(2020) - Standard Test Method for Determination of Total Neutralizing Capability and Dissolved Calcium and Magnesium Oxide in Lime for Flue Gas Desulfurization (FGD)
• Effective Date: 01-May-2019
• Referred By: ASTM C1707-18 - Standard Specification for Pozzolanic Hydraulic Lime for Structural Purposes
• Effective Date: 01-May-2019
• Referred By: ASTM C207-18 - Standard Specification for Hydrated Lime for Masonry Purposes
• Effective Date: 01-May-2019
• Referred By: ASTM C1875-18(2024) - Standard Practice for Determination of Major and Minor Elements in Aqueous Pore Solutions of Cementitious Pastes by Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES)
• Effective Date: 01-May-2019
• Referred By: ASTM D6249-19 - Standard Guide for Alkaline Stabilization of Wastewater Treatment Plant Residuals
• Effective Date: 01-May-2019
• Referred By: ASTM C737-22 - Standard Specification for Limestone for Dusting of Coal Mines
• Effective Date: 01-May-2019
• Referred By: ASTM C926-23a - Standard Specification for Application of Portland Cement-Based Plaster
• Effective Date: 01-May-2019
• Referred By: ASTM C1271-99(2020) - Standard Test Method for X-ray Spectrometric Analysis of Lime and Limestone
• Effective Date: 01-May-2019

Standards Content (Sample)

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
Designation: C25 − 19
Standard Test Methods for
Chemical Analysis of Limestone, Quicklime, and Hydrated
1
Lime
This standard is issued under the fixed designation C25; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1
ε NOTE—Editorially added research report to Section 21 in April 2024.
1. Scope
Free Calcium Oxide Appendix X6
Free Moisture in Hydrated Lime 21
1.1 These test methods cover the chemical analysis of
Free Moisture in Limestone 20
high-calcium and dolomitic limestone, quicklime, and hy- Free Silica 29
Insoluble Matter Including Silicon Dioxide:
drated lime. These test methods are classified as either standard
Standard Method 8
(preferred) or alternative (optional).
Optional Perchloric Acid Method 9
Insoluble Matter Other Than Silicon Dioxide 11
1.2 The standard test methods are those that employ classi-
Loss on Ignition 19
cal gravimetric or volumetric analytical procedures and are
Magnesium Oxide 18
Manganese:
typically those required for referee analyses where chemical
Bismuthate Method Appendix X4
specification requirements are an essential part of contractual
Periodate (Photometric) Method 27
agreement between buyer and seller.
pH Determination of Alkaline Earth Solutions 34
Phosphorus:
1.3 Alternative or optional test methods are provided for
Titrimetric Method Appendix X3
those who wish to use procedures shorter or more convenient Molybdovanadate Method 26
Silicon Dioxide 10
than the standard methods for the routine determinations of
Strontium Oxide Appendix X2
certain constituents. Optional test methods may sometimes be
Sulfur Trioxide 23
Total Carbon:
preferred to the standard test methods, but frequently the use of
Direct Combustion-Thermal Conductivity Cell 32
modern and expensive instrumentation is indicated which may
Method
not be accessible to everyone. Therefore, the use of these test
Total Carbon and Sulfur:
Combustion ⁄Infrared Detection Method 35
methods must be left to the discretion of each laboratory.
Total Iron:
1.4 The analytical procedures appear in the following order:
Standard Method, Potassium Dichromate 13
Titration
Section
Potassium Permanganate Titration Method Appendix X1
Aluminum Oxide 15
Ortho-Phenanthroline, Photometric Method 14
Available Lime Index 28
Total Sulfur:
Calcium and Magnesium Oxide:
Sodium Carbonate Fusion 24
Alternative EDTA Titration Method 31
Combustion-Iodate Titration Method 25
Calcium Carbonate Equivalent 33
Unhydrated Oxides 30
Calcium Oxide:
Gravimetric Method 16
1.5 This standard does not purport to address all of the
Volumetric Method 17
safety concerns, if any, associated with its use. It is the
Carbon Dioxide by Standard Method 22
Combined Oxides of Iron and Aluminum 12 responsibility of the user of this standard to establish appro-
Ferrous Iron Appendix X5
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
9.3, 10.2.1, 18.4.3,
1 For specific precautionary statements, see
These test methods are under the jurisdiction of ASTM Committee C07 on
31.6.4.2, X2.3.1, and X5.4.1.1.
Lime and Limestone and are the direct responsibility of Subcommittee C07.05 on
Chemical Tests.
1.6 This international standard was developed in accor-
Current edition approved May 1, 2019. Published July 2019. Originally approved
dance with internationally recognized principles on standard-
in 1919. Last previous edition approved in 2017 as C25 – 17. DOI: 10.1520/C0025-
19E01. ization established in the Decision on Principles for the
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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´1
C25 − 19
Development of International Standards, Guides and Recom- 5. General Apparatus and Materials and Reagents
mendations issued by the World Trade Organization Technical
5.1 General Apparatus and Materials:
Barriers to Trade (TBT) Committee.
5.1.1 Balance—The balance shall be of an analytical type
with a capacity not to exceed 200 g. It may be of conventional
2. Referenced Documents
design or it may be a constant-load, direct-reading type. It shall
2
2.1 ASTM Standards:
be capable of reproducing weighings within 0.0002 g with an
C50/C50M Practice for Sampling, Sample Preparation,
accuracy of 60.0002 g. Rapid weighing devices that may be
Pac
...