ASTM C821-22

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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
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
2.1 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.
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.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. 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
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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
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