ASTM C821-22

Standard Specification for Lime for Use with Pozzolans

ABSTRACT
This specification covers all types of commercial hydrated lime such as: high-calcium, magnesium, or dolomitic-hydrated lime. This lime is used with pozzolans. The lime shall conform to the required physical and chemical limits: chemical factor, blaine fineness, and pozzolanic receptivity index. The following test methods shall be done: determination of calcium oxide, magnesium oxide, and carbon dioxide; calculation of chemical factor; blaine fineness; pozzolanic receptivity index; lime-pozzolan strength; and lime-pozzolan-aggregate strength and freeze-thaw resistance.
SCOPE
1.1 This specification covers all types of commercial hydrated lime such as: high-calcium, magnesian, or dolomitic-hydrated lime. By-product limes and slaked quick limes in dry, wet, or slurried form are also included.  
1.2 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.  
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.

General Information

• Status: Published
• Publication Date: 30-Nov-2022
• ICS: 91.100.10 - Cement. Gypsum. Lime. Mortar
• Technical Committee: C07 - Lime and Limestone
• Drafting Committee: C07.02 - Specifications and Guidelines

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.
Designation:C821 −22
Standard Specification for
1
Lime for Use with Pozzolans
This standard is issued under the fixed designation C821; 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.
1. Scope* C593 Specification for FlyAsh and Other Pozzolans for Use
With Lime for Soil Stabilization
1.1 This specification covers all types of commercial hy-
C1271 Test Method for X-ray Spectrometric Analysis of
drated lime such as: high-calcium, magnesian, or dolomitic-
Lime and Limestone
hydrated lime. By-product limes and slaked quick limes in dry,
C1301 Test Method for Major and Trace Elements in Lime-
wet, or slurried form are also included.
stone and Lime by Inductively Coupled Plasma-Atomic
1.2 Units—The values stated in either SI units or inch-
Emission Spectroscopy (ICP) and Atomic Absorption
pound units are to be regarded separately as standard. The
(AA)
values stated in each system are not necessarily exact equiva-
lents; therefore, to ensure conformance with the standard, each
3. Terminology
system shall be used independently of the other, and values
3.1 Definitions:
from the two systems shall not be combined.
3.1.1 Fordefinitionsoftermsusedinthisspecification,refer
1.3 This standard does not purport to address all of the
to Terminology C51.
safety concerns, if any, associated with its use. It is the
3.2 Definitions of Terms Specific to This Standard:
responsibility of the user of this standard to establish appro-
3.2.1 chemical factor, n—a numerical value of the active
priate safety, health, and environmental practices and deter-
constituents in the hydrated lime that react chemically with a
mine the applicability of regulatory limitations prior to use.
pozzolan. The value is based on the combined calcium oxide
1.4 This international standard was developed in accor-
equivalents of free calcium oxide, calcium hydroxide, and
dance with internationally recognized principles on standard-
magnesium oxide. Calcium carbonate and magnesium hydrox-
ization established in the Decision on Principles for the
ideareexcluded,sincethesecompoundshavebeenfoundtobe
Development of International Standards, Guides and Recom-
nonreactive.
mendations issued by the World Trade Organization Technical
3.2.2 pozzolanic receptivity index, n—a performance factor
Barriers to Trade (TBT) Committee.
incorporating both chemical quality and fineness, determined
by Eq 3.
2. Referenced Documents
2
2.1 ASTM Standards:
4. Chemical and Physical Requirements
C25 Test Methods for Chemical Analysis of Limestone,
4.1 The lime shall conform to the requirements listed in
Quicklime, and Hydrated Lime
Table 1, except as noted in Section 5.
C50 Practice for Sampling, Sample Preparation, Packaging,
and Marking of Lime and Limestone Products
5. Performance Requirements
C51 Terminology Relating to Lime and Limestone (as Used
5.1 If the chemical factor, Blaine fineness, or pozzolanic
by the Industry)
receptivity index is below the limits given in Table 1, the lime
C204 Test Methods for Fineness of Hydraulic Cement by
shall be required to meet the applicable performance require-
Air-Permeability Apparatus
ments listed in Table 2. Where such lime complies with the
limitslistedinTable2,itshallbeconsideredacceptableforuse
1
with pozzolans. However, it may be necessary to increase the
This specification is under the jurisdiction of ASTM Committee C07 on Lime
and Limestone and is the direct responsibility of Subcommittee C07.02 on
lime content in the lime-pozzolan mixtures in order to meet
Specifications and Guidelines.
minimum design criteria.
Current edition approved Dec. 1, 2022. Published December 2022. Originally
approved in 1975. Last previous edition approved in 2014 as C821 – 14. DOI:
6. Test Methods
10.1520/C0821-22.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.1 Chemical Factor:
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
6.1.1 Determinecalciumoxide(CaO)andmagnesiumoxide
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. (MgO) contents in accordance with Methods C25, C1271,or
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
C821−22
TABLE 1 Chemical and Physical Requirements
6.2 Blaine Fineness—Calculate in accorda
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: C821 − 14 C821 − 22
Standard Specification for
1
Lime for Use with Pozzolans
This standard is issued under the fixed designation C821; 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.
1. Scope*
1.1 This specification covers all types of commercial hydrated lime such as: high-calcium, magnesium,magnesian, or
dolomitic-hydrated lime. By-product limes and slaked quick limes in dry, wet, or slurried form are also included.
1.2 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values
givenstated in parentheses are mathematical conversions to SI units that are provided for information only and are not considered
standard.each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall
be used independently of the other, and values from the two systems shall not be combined.
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 safety, health, and healthenvironmental 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
2
2.1 ASTM Standards:
C25 Test Methods for Chemical Analysis of Limestone, Quicklime, and Hydrated Lime
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)
C204 Test Methods for Fineness of Hydraulic Cement by Air-Permeability Apparatus
C593 Specification for Fly Ash and Other Pozzolans for Use With Lime for Soil Stabilization
C1271 Test Method for X-ray Spectrometric Analysis of Lime and Limestone
C1301 Test Method for Major and Trace Elements in Limestone and Lime by Inductively Coupled Plasma-Atomic Emission
Spectroscopy (ICP) and Atomic Absorption (AA)
3. Terminology
3.1 Definitions:
3.1.1 For definitions of terms used in this specification, refer to Terminology C51.
1
This specification is under the jurisdiction of ASTM Committee C07 on Lime and Limestone and is the direct responsibility of Subcommittee C07.02 on Specifications
and Guidelines.
Current edition approved July 1, 2014Dec. 1, 2022. Published July 2014December 2022. Originally approved in 1975. Last previous edition approved in 20092014 as
C821 – 09.C821 – 14. DOI: 10.1520/C0821-14.10.1520/C0821-22.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
C821 − 22
3.2 Definitions of Terms Specific to This Standard:
3.2.1 chemical factor, n—a numerical value of the active constituents in the hydrated lime that react chemically with a pozzolan.
The value is based on the combined calcium oxide equivalents of free calcium oxide, calcium hydroxide, and magnesium oxide.
Calcium carbonate and magnesium hydroxide are excluded, since these compounds have been found to be nonreactive.
3.2.2 pozzolanic receptivity index, n—a performance factor incorporating both chemical quality and fineness, determined by Eq
3.
4. Chemical and Physical Requirements
4.1 The lime shall conform to the requirements listed in Table 1, except as noted in Section 5.
5. Performance Requirements
5.1 If the chemical factor, Blaine fineness, or pozzolanic receptivity index is below the limits given in Table 1, the lime shall be
required to meet the applicable performance requirements listed in Table 2. Where such lime complies with the limits listed in
Table 2, it shall be considered acceptable for use with pozzolans. However,
...