ASTM C642-21

Standard Test Method for Density, Absorption, and Voids in Hardened Concrete

SIGNIFICANCE AND USE
4.1 This test method is useful in developing the data required for conversions between mass and volume for concrete. It can be used to determine conformance with specifications for concrete and to show differences from place to place within a mass of concrete.
SCOPE
1.1 This test method covers the determinations of density, percent absorption, and percent voids in hardened concrete.  
1.2 The text of this test method references notes and footnotes which provide explanatory information. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of this standard.  
1.3 The values stated in SI units are to be regarded as 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: 14-Dec-2021
• ICS: 91.100.30 - Concrete and concrete products
• Technical Committee: C09 - Concrete and Concrete Aggregates
• Drafting Committee: C09.66 - Concrete's Resistance to Fluid Penetration

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: C642 − 21
Standard Test Method for
1
Density, Absorption, and Voids in Hardened Concrete
This standard is issued under the fixed designation C642; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* crete. It can be used to determine conformance with specifica-
tions for concrete and to show differences from place to place
1.1 This test method covers the determinations of density,
within a mass of concrete.
percent absorption, and percent voids in hardened concrete.
1.2 The text of this test method references notes and
5. Apparatus
footnotes which provide explanatory information. These notes
5.1 Balance, sensitive to 0.025 % of the mass of the
and footnotes (excluding those in tables and figures) shall not
specimen.
be considered as requirements of this standard.
5.2 Container, suitable for immersing the specimen and
1.3 The values stated in SI units are to be regarded as the
suitable wire for suspending the specimen in water.
standard.
1.4 This standard does not purport to address all of the
6. Test Specimen
safety concerns, if any, associated with its use. It is the
6.1 Whenever possible, the sample shall consist of several
responsibility of the user of this standard to establish appro-
individual portions of concrete, each to be tested separately.
priate safety, health, and environmental practices and deter-
The individual portions may be pieces of cylinders, cores, or
mine the applicability of regulatory limitations prior to use.
beams of any desired shape or size, except that the volume of
1.5 This international standard was developed in accor-
3
each portion shall be not less than 350 cm (or for normal
dance with internationally recognized principles on standard-
weight concrete, approximately 800 g); and each portion shall
ization established in the Decision on Principles for the
be free from observable cracks, fissures, or shattered edges.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
7. Procedure
Barriers to Trade (TBT) Committee.
7.1 Oven-Dry Mass—Determine the mass of the portions,
and dry in an oven at a temperature of 110°C 6 5°C for not
2. Referenced Documents
less than 24 h. After removing each specimen from the oven,
2
2.1 ASTM Standards:
allow it to cool in dry air (preferably in a desiccator) to a
C125Terminology Relating to Concrete and Concrete Ag-
temperature of 20°C to 25°C and determine the mass. If the
gregates
specimen was comparatively dry when its mass was first
determined, and the second mass closely agrees with the first,
3. Terminology
consideritdry.Ifthespecimenwaswetwhenitsmasswasfirst
3.1 For definitions of terms used in this standard, refer to
determined, place it in the oven for a second drying treatment
Terminology C125.
of 24 h and again determine the mass. If the third value checks
the second, consider the specimen dry. In case of any doubt,
4. Significance and Use
redry the specimen for 24h periods until check values of mass
4.1 This test method is useful in developing the data
are obtained. If the difference between values obtained from
required for conversions between mass and volume for con-
two successive values of mass exceeds 0.5% of the lesser
value, return the specimens to the oven for an additional 24h
drying period, and repeat the procedure until the difference
1
This test method is under the jurisdiction of ASTM Committee C09 on
between any two successive values is less than 0.5% of the
Concrete and ConcreteAggregates and is the direct responsibility of Subcommittee
C09.66 on Concrete’s Resistance to Fluid Penetration.
lowest value obtained. Designate this last value A.
Current edition approved Dec. 15, 2021. Published January 2022. Originally
7.2 Saturated Mass After Immersion—Immerse the
approved in 1969. Last previous edition approved in 2013 as C642–13. DOI:
10.1520/C0642-21.
specimen, after final drying, cooling, and determination of
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
mass,inwateratapproximately21°Cfornotlessthan48hand
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
untiltwosuccessivevaluesofmassofthesurface-driedsample
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. atintervalsof24hshowanincreaseinmassoflessthan0.5%
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM I
...

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: C642 − 13 C642 − 21
Standard Test Method for
1
Density, Absorption, and Voids in Hardened Concrete
This standard is issued under the fixed designation C642; 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 test method covers the determinations of density, percent absorption, and percent voids in hardened concrete.
1.2 The text of this test method references notes and footnotes which provide explanatory information. These notes and footnotes
(excluding those in tables and figures) shall not be considered as requirements of this standard.
1.3 The values stated in SI units are to be regarded as 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 and health practices and determine the applicability of regulatory
limitations prior to use.
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.
2. Referenced Documents
2
2.1 ASTM Standards:
C125 Terminology Relating to Concrete and Concrete Aggregates
3. Terminology
3.1 For definitions of terms used in this standard, refer to Terminology C125.
4. Significance and Use
4.1 This test method is useful in developing the data required for conversions between mass and volume for concrete. It can be
used to determine conformance with specifications for concrete and to show differences from place to place within a mass of
concrete.
1
This test method is under the jurisdiction of ASTM Committee C09 on Concrete and Concrete Aggregates and is the direct responsibility of Subcommittee C09.66 on
Concrete’s Resistance to Fluid Penetration.
Current edition approved Feb. 1, 2013Dec. 15, 2021. Published February 2013January 2022. Originally approved in 1969. Last previous edition approved in 20062013
as C642 – 06.C642 – 13. DOI: 10.1520/C0642-13.10.1520/C0642-21.
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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C642 − 21
5. Apparatus
5.1 Balance, sensitive to 0.025 % of the mass of the specimen.
5.2 Container, suitable for immersing the specimen and suitable wire for suspending the specimen in water.
6. Test Specimen
6.1 Whenever possible, the sample shall consist of several individual portions of concrete, each to be tested separately. The
individual portions may be pieces of cylinders, cores, or beams of any desired shape or size, except that the volume of each portion
3
shall be not less than 350 cm (or for normal weight concrete, approximately 800 g); and each portion shall be free from observable
cracks, fissures, or shattered edges.
7. Procedure
7.1 Oven-Dry Mass—Determine the mass of the portions, and dry in an oven at a temperature of 110110 °C 6 5°C5 °C for not
less than 24 h. After removing each specimen from the oven, allow it to cool in dry air (preferably in a desiccator) to a temperature
of 2020 °C to 25°C25 °C and determine the mass. If the specimen was comparatively dry when its mass was first determined, and
the second mass closely agrees with the first, consider it dry. If the specimen was wet when its mass was first determined, place
it in the oven for a second drying treatment of 24 h and again determine the mass. If the third value checks the second, consider
the specimen dry. In case of any doubt, redry the specime
...