ASTM C1761/C1761M-23

Standard Specification for Lightweight Aggregate for Internal Curing of Concrete

SCOPE
1.1 This specification covers lightweight aggregate intended to provide water for internal curing of concrete. It includes test methods for determining the absorption and desorption properties of lightweight aggregate.
Note 1: Internal curing provides an additional source of water to sustain hydration and substantially reduce the early-age autogenous shrinkage and self-desiccation that can be significant contributors to early-age cracking. Appendix X1 provides guidance on calculating the quantity of lightweight aggregate for internal curing.  
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance. Some values have only SI units because the inch-pound equivalents are not used in practice.
Note 2: Sieve size is identified by its standard designation in Specification E11. The alternative designation given in parentheses is for information only and does not represent a different standard sieve size.  
1.3 The text of this specification references notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.  
1.4 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.  
1.5 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: 31-May-2023
• ICS: 91.100.30 - Concrete and concrete products
• Technical Committee: C09 - Concrete and Concrete Aggregates
• Drafting Committee: C09.21 - Lightweight Aggregates and Concrete

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: C1761/C1761M − 23
Standard Specification for
1
Lightweight Aggregate for Internal Curing of Concrete
This standard is issued under the fixed designation C1761/C1761M; 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* 2. Referenced Documents
2
2.1 ASTM Standards:
1.1 This specification covers lightweight aggregate intended
C29/C29M Test Method for Bulk Density (“Unit Weight”)
to provide water for internal curing of concrete. It includes test
and Voids in Aggregate
methods for determining the absorption and desorption prop-
C40/C40M Test Method for Organic Impurities in Fine
erties of lightweight aggregate.
Aggregates for Concrete
NOTE 1—Internal curing provides an additional source of water to
C87/C87M Test Method for Effect of Organic Impurities in
sustain hydration and substantially reduce the early-age autogenous
Fine Aggregate on Strength of Mortar
shrinkage and self-desiccation that can be significant contributors to
early-age cracking. Appendix X1 provides guidance on calculating the
C114 Test Methods for Chemical Analysis of Hydraulic
quantity of lightweight aggregate for internal curing.
Cement
C125 Terminology Relating to Concrete and Concrete Ag-
1.2 The values stated in either SI units or inch-pound units
gregates
are to be regarded separately as standard. The values stated in
C128 Test Method for Relative Density (Specific Gravity)
each system may not be exact equivalents; therefore, each
and Absorption of Fine Aggregate
system shall be used independently of the other. Combining
C136/C136M Test Method for Sieve Analysis of Fine and
values from the two systems may result in non-conformance.
Coarse Aggregates
Some values have only SI units because the inch-pound
C142/C142M Test Method for Clay Lumps and Friable
equivalents are not used in practice.
Particles in Aggregates
NOTE 2—Sieve size is identified by its standard designation in Speci-
C330/C330M Specification for Lightweight Aggregates for
fication E11. The alternative designation given in parentheses is for
Structural Concrete
information only and does not represent a different standard sieve size.
C641 Test Method for Iron Staining Materials in Light-
1.3 The text of this specification references notes and
weight Concrete Aggregates
footnotes that provide explanatory material. These notes and
C702/C702M Practice for Reducing Samples of Aggregate
footnotes (excluding those in tables and figures) shall not be
to Testing Size
considered as requirements of the standard.
C1498 Test Method for Hygroscopic Sorption Isotherms of
Building Materials
1.4 This standard does not purport to address all of the
C1608 Test Method for Chemical Shrinkage of Hydraulic
safety concerns, if any, associated with its use. It is the
Cement Paste
responsibility of the user of this standard to establish appro-
C1698 Test Method for Autogenous Strain of Cement Paste
priate safety, health, and environmental practices and deter-
and Mortar
mine the applicability of regulatory limitations prior to use.
D75/D75M Practice for Sampling Aggregates
1.5 This international standard was developed in accor-
D2172/D2172M Test Methods for Quantitative Extraction of
dance with internationally recognized principles on standard-
Asphalt Binder from Asphalt Mixtures
ization established in the Decision on Principles for the
E11 Specification for Woven Wire Test Sieve Cloth and Test
Development of International Standards, Guides and Recom-
Sieves
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
3. Terminology
3.1 Definitions:
1
This specification is under the jurisdiction of ASTM Committee C09 on
Concrete and Concrete Aggregates and is the direct responsibility of Subcommittee
2
C09.21 on Lightweight Aggregates and Concrete. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved June 1, 2023. Published August 2023. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
approved in 2012. Last previous edition approved in 2017 as C1761/C1761M – 17. Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/C1761_C1761M-23. 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

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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: C1761/C1761M − 17 C1761/C1761M − 23
Standard Specification for
1
Lightweight Aggregate for Internal Curing of Concrete
This standard is issued under the fixed designation C1761/C1761M; 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 lightweight aggregate intended to provide water for internal curing of concrete. It includes test
methods for determining the absorption and desorption properties of lightweight aggregate.
NOTE 1—Internal curing provides an additional source of water to sustain hydration and substantially reduce the early-age autogenous shrinkage and
self-desiccation that can be significant contributors to early-age cracking. Appendix X1 provides guidance on calculating the quantity of lightweight
aggregate for internal curing.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the
two systems may result in non-conformance. Some values have only SI units because the inch-pound equivalents are not used in
practice.
NOTE 2—Sieve size is identified by its standard designation in Specification E11. The alternative designation given in parentheses is for information only
and does not represent a different standard sieve size.
1.3 The text of this specification references notes and footnotes that provide explanatory material. These notes and footnotes
(excluding those in tables and figures) shall not be considered as requirements of the standard.
1.4 This specificationstandard 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 and healthsafety, health, and environmental practices and
determine the applicability of regulatory limitations prior to use.
1.5 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:
C29/C29M Test Method for Bulk Density (“Unit Weight”) and Voids in Aggregate
C40/C40M Test Method for Organic Impurities in Fine Aggregates for Concrete
C87/C87M Test Method for Effect of Organic Impurities in Fine Aggregate on Strength of Mortar
C114 Test Methods for Chemical Analysis of Hydraulic Cement
C125 Terminology Relating to Concrete and Concrete Aggregates
1
This specification is under the jurisdiction of ASTM Committee C09 on Concrete and Concrete Aggregates and is the direct responsibility of Subcommittee C09.21 on
Lightweight Aggregates and Concrete.
Current edition approved June 15, 2017June 1, 2023. Published July 2017August 2023. Originally approved in 2012. Last previous edition approved in 20152017 as
C1761/C1761M – 15.C1761/C1761M – 17. DOI: 10.1520/C1761_C1761M-17.10.1520/C1761_C1761M-23.
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

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C1761/C1761M − 23
C128 Test Method for Relative Density (Specific Gravity) and Absorption of Fine Aggregate
C136/C136M Test Method for Sieve Analysis of Fine and Coarse Aggregates
C142/C142M Test Method for Clay Lumps and Friable Particles in Aggregates
C330/C330M Specification for Lightweight Aggregates for Structural Concrete
C641 Test Method for Iron Staining Materials in Lightweight Concrete Aggregates
C702/C702M Practice for Reducing Samples of Aggregate to Testing Size
C1498 Test Method for Hygroscopic Sorption Isotherms of Building Materials
C1608 Test Method for Chemical Shrinkage of Hydraulic Cement Paste
C1698 Test Method for Autogenous Strain of Cement Pas
...