ASTM C873/C873M-23
(Test Method)Standard Test Method for Compressive Strength of Concrete Cylinders Cast in Place in Cylindrical Molds
Standard Test Method for Compressive Strength of Concrete Cylinders Cast in Place in Cylindrical Molds
ABSTRACT
This test method covers the determination of strength of cylindrical concrete specimens that have been molded in place using special molds attached to formwork. A concrete cylinder mold assembly consisting of a mold and a tubular support member is fastened within the concrete formwork prior to placement of the concrete. The elevation of the mold upper edge is adjusted to correspond to the plane of the finished slab surface. The mold support prevents direct contact of the slab concrete with the outside of the mold and permits its easy removal from the hardened concrete. Strength of cast-in-place cylinders may be used for various purposes, such as estimating the load-bearing capacity of slabs, determining the time of form and shore removal, and determining the effectiveness of curing and protection. Consolidation of concrete in the mold may be varied to simulate the conditions of placement. Internal vibration of concrete in the mold is prohibited except under special circumstances.
SIGNIFICANCE AND USE
4.1 Cast-in-place cylinder strength relates to the strength of concrete in the structure due to the similarity of curing conditions because the cylinder is cured within the slab. However, due to differences in moisture condition, degree of consolidation, specimen size, and length-diameter ratio, there is not a unique relationship between the strength of cast-in-place cylinders and cores of the same age. When cores can be drilled undamaged and tested in the same moisture condition as the cast-in-place cylinders, the strength of the cylinders can be expected to be on average 10 % higher than the cores at ages up to 91 days for specimens of the same size and length-diameter ratio.4
4.2 Strength of cast-in-place cylinders may be used for various purposes, such as estimating the load-bearing capacity of slabs, determining the time of form and shore removal, and determining the effectiveness of curing and protection.
SCOPE
1.1 This test method covers the determination of strength of cylindrical concrete specimens that have been molded in place using special molds attached to formwork. This test method is limited to use in slabs where the depth of concrete is from 125 mm to 300 mm [5 in. to 12 in.].
1.2 The text of this standard refers to 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.
1.3 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. Combining values from the two systems may result in non-conformance with 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. (Warning—Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure.2)
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.
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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: C873/C873M − 23
Standard Test Method for
Compressive Strength of Concrete Cylinders Cast in Place
1
in Cylindrical Molds
This standard is issued under the fixed designation C873/C873M; 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
3
2.1 ASTM Standards:
1.1 This test method covers the determination of strength of
C39/C39M Test Method for Compressive Strength of Cylin-
cylindrical concrete specimens that have been molded in place
drical Concrete Specimens
using special molds attached to formwork. This test method is
C42/C42M Test Method for Obtaining and Testing Drilled
limited to use in slabs where the depth of concrete is from
Cores and Sawed Beams of Concrete
125 mm to 300 mm [5 in. to 12 in.].
C470/C470M Specification for Molds for Forming Concrete
1.2 The text of this standard refers to notes and footnotes
Test Cylinders Vertically
that provide explanatory material. These notes and footnotes
C617/C617M Practice for Capping Cylindrical Concrete
(excluding those in tables and figures) shall not be considered
Specimens
as requirements of the standard.
C670 Practice for Preparing Precision and Bias Statements
for Test Methods for Construction Materials
1.3 Units—The values stated in either SI units or inch-
C1231/C1231M Practice for Use of Unbonded Caps in
pound units are to be regarded separately as standard. The
Determination of Compressive Strength of Hardened Cy-
values stated in each system are not necessarily exact equiva-
lindrical Concrete Specimens
lents; therefore, to ensure conformance with the standard, each
system shall be used independently of the other, and values
3. Summary of Test Method
from the two systems shall not be combined. Combining values
from the two systems may result in non-conformance with the 3.1 A concrete cylinder mold assembly consisting of a mold
standard.
and a tubular support member is fastened within the concrete
formwork prior to placement of the concrete as shown in Fig.
1.4 This standard does not purport to address all of the
1. The elevation of the mold upper edge is adjusted to
safety concerns, if any, associated with its use. It is the
correspond to the level of the finished slab surface. The mold
responsibility of the user of this standard to establish appro-
support prevents direct contact of the slab concrete with the
priate safety, health, and environmental practices and deter-
outside of the mold and permits easy removal of the mold from
mine the applicability of regulatory limitations prior to use.
the slab. The mold is filled at the time its location is reached in
(Warning—Fresh hydraulic cementitious mixtures are caustic
the normal course of concrete placement. The specimen in the
and may cause chemical burns to skin and tissue upon
2 “cured-in-place” condition is removed from its in-place loca-
prolonged exposure. )
tion immediately prior to de-molding, capping, and testing.
1.5 This international standard was developed in accor-
The reported compressive strength is corrected on the basis of
dance with internationally recognized principles on standard-
specimen length-diameter ratio using correction factors pro-
ization established in the Decision on Principles for the
vided in the section on calculation of Test Method C42/C42M.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
4. Significance and Use
Barriers to Trade (TBT) Committee.
4.1 Cast-in-place cylinder strength relates to the strength of
concrete in the structure due to the similarity of curing
conditions because the cylinder is cured within the slab.
1
This test method is under the jurisdiction of ASTM Committee C09 on
However, due to differences in moisture condition, degree of
Concrete and Concrete Aggregates and is the direct responsibility of Subcommittee
C09.61 on Testing for Strength.
Current edition approved Oct. 1, 2023. Published October 2023. Originally
3
approved in 1977. Last previous edition approved in 2015 as C873/C873M–15. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
DOI: 10.1520/C0873_C0873M-23. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
2
Section on Safety Precautions, Manual of Aggregate and Concrete Testing, Standards volume information, refer to the standard’s Document Summary page on
Annual Book of ASTM Standards, Vol 04.02. the ASTM website.
...
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: C873/C873M − 15 C873/C873M − 23
Standard Test Method for
Compressive Strength of Concrete Cylinders Cast in Place
1
in Cylindrical Molds
This standard is issued under the fixed designation C873/C873M; 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 determination of strength of cylindrical concrete specimens that have been molded in place using
special molds attached to formwork. This test method is limited to use in slabs where the depth of concrete is from 125125 mm
to 300 mm [5[5 in. to 12 in.].
1.2 The text of this standard refers to 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.
1.3 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 may not beare not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall
be used independently of the other. other, and values from the two systems shall not be combined. Combining values from the two
systems may result in non-conformance with 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 consult and establish appropriate safety and healthsafety, health, and environmental practices and
determine the applicability of regulatory limitations prior to use. (Warning—Fresh hydraulic cementitious mixtures are caustic
2
and may cause chemical burns to skin and tissue upon prolonged exposure. )
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
3
2.1 ASTM Standards:
C39/C39M Test Method for Compressive Strength of Cylindrical Concrete Specimens
C42/C42M Test Method for Obtaining and Testing Drilled Cores and Sawed Beams of Concrete
C470/C470M Specification for Molds for Forming Concrete Test Cylinders Vertically
C617C617/C617M Practice for Capping Cylindrical Concrete Specimens
C670 Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials
1
This test method is under the jurisdiction of ASTM Committee C09 on Concrete and Concrete Aggregates and is the direct responsibility of Subcommittee C09.61 on
Testing for Strength.
Current edition approved Dec. 1, 2015Oct. 1, 2023. Published February 2016October 2023. Originally approved in 1977. Last previous edition approved in 20102015 as
C873/C873M–10a. DOI: 10.1520/C0873_C0873M-15.–15. DOI: 10.1520/C0873_C0873M-23.
2
Section on Safety Precautions, Manual of Aggregate and Concrete Testing, Annual Book of ASTM Standards, Vol 04.02.
3
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
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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C873/C873M − 23
C1231/C1231M Practice for Use of Unbonded Caps in Determination of Compressive Strength of Hardened Cylindrical
Concrete Specimens
3. Summary of Test Method
3.1 A concrete cylinder mold assembly consisting of a mold and a tubular support member is fastened within the concrete
formwork prior to placement of the concrete as shown in Fig. 1. The elevation of the mold upper edge is adjusted to correspond
to the level of the finished slab surface. The mold support prevents direct contact of the slab concrete with the outside of the mold
and permits easy removal of the mold from the slab. The mold is filled at the time its location is reached in the normal course of
concrete placement. The specimen in the “cured-in-place” condition is removed from its in-place location immedia
...
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