ASTM C873/C873M-10
(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 and cured in place using special molds attached to formwork for slabs. 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. A strength correction factor is required if the length-diameter ratio is less than 1.75.
SIGNIFICANCE AND USE
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.
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 to 300 mm [5 to 12 in.].
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 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 with the standard.
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 consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. (WarningFresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure. )
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Designation: C873/C873M – 10
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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope* C42/C42M Test Method for Obtaining and Testing Drilled
Cores and Sawed Beams of Concrete
1.1 This test method covers the determination of strength of
C470/C470M Specification for Molds for Forming Con-
cylindrical concrete specimens that have been molded in place
crete Test Cylinders Vertically
using special molds attached to formwork. This test method is
C617 Practice for Capping Cylindrical Concrete Specimens
limited to use in slabs where the depth of concrete is from 125
C670 Practice for Preparing Precision and Bias Statements
to 300 mm [5 to 12 in.].
for Test Methods for Construction Materials
1.2 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 Con-
values stated in each system may not be exact equivalents;
crete Cylinders
therefore,eachsystemshallbeusedindependentlyoftheother.
Combining values from the two systems may result in non-
3. Summary of Test Method
conformance with the standard.
3.1 Aconcrete cylinder mold assembly consisting of a mold
1.3 This standard does not purport to address all of the
and a tubular support member is fastened within the concrete
safety concerns, if any, associated with its use. It is the
formwork prior to placement of the concrete as shown in Fig.
responsibility of the user of this standard to consult and
1. The elevation of the mold upper edge is adjusted to
establish appropriate safety and health practices and deter-
correspond to the level of the finished slab surface. The mold
mine the applicability of regulatory limitations prior to use.
support prevents direct contact of the slab concrete with the
(Warning—Fresh hydraulic cementitious mixtures are caustic
outside of the mold and permits easy removal of the mold from
and may cause chemical burns to skin and tissue upon
2 the slab. The mold is filled at the time its location is reached in
prolonged exposure. )
the normal course of concrete placement. The specimen in the
2. Referenced Documents “cured-in-place” condition is removed from its in-place loca-
3
tion immediately prior to de-molding, capping, and testing.
2.1 ASTM Standards:
The reported compressive strength is corrected on the basis of
C39/C39M Test Method for Compressive Strength of Cy-
specimen length-diameter ratio using correction factors pro-
lindrical Concrete Specimens
vided in the section on calculation of Test Method C42/C42M.
4. Significance and Use
1
This test method is under the jurisdiction of ASTM Committee C09 on
4.1 Cast-in-place cylinder strength relates to the strength of
Concrete and ConcreteAggregates and is the direct responsibility of Subcommittee
C09.61 on Testing for Strength.
concrete in the structure due to the similarity of curing
Current edition approved June 15, 2010. Published July 2010. Originally
conditions because the cylinder is cured within the slab.
e1
approved in 1977. Last previous edition approved in 2004 as C873/C873M–04 .
However, due to differences in moisture condition, degree of
DOI: 10.1520/C0873_C0873M-10.
2
consolidation, specimen size, and length-diameter ratio, there
Section on Safety Precautions, Manual of Aggregate and Concrete Testing,
Annual Book of ASTM Standards, Vol 04.02.
is not a unique relationship between the strength of cast-in-
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
place cylinders and cores of the same age. When cores can be
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
drilledundamagedandtestedinthesamemoistureconditionas
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. the cast-in-place cylinders, the strength of the cylinders can be
*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.
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C873/C873M – 10
FIG. 1 Schematic of Cast-in-Place Cylinder Mold Assembly
expected to be on average 10 % higher than the cores at ages of slabs, determining the time of form and shore removal, and
up to 91 days for s
...
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.
´1
Designation:C873/C873M–04 Designation: C873/C873M – 10
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.
This standard has been approved for use by agencies of the Department of Defense.
1
´ NOTE—The designation was changed editorially to agree with the existing values statement in the Scope in March 2008.
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 125 to
12 in. [125300 mm [5 to 300 mm].12 in.].
1.2 Units—Thevaluesstatedineitherinch-poundsSIunitsorSIinch-poundunitsshallaretoberegardedseparatelyasstandard.
SI units are shown The values stated in brackets. The values stated each system may not be exact equivalents,; therefore, each
system mustshall be used independently of the other. Combining values offrom the two unitssystems may result in
non-conformance with the standard.
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 consult and establish appropriate safety and health practices and determine the applicability of
regulatory limitations prior to use. (Warning—Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns
2
to skin and tissue upon prolonged exposure. )
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
C617 Practice for Capping Cylindrical Concrete Specimens
C670 Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials Practice for Preparing
Precision and Bias Statements for Test Methods for Construction Materials
C1231/C1231M Practice for Use of Unbonded Caps in Determination of Compressive Strength of Hardened Concrete
Cylinders
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 planelevel 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 fromof the hardened concrete.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 immediately prior to de-molding, capping, and testing. The reported compressive strength is corrected on the basis of
specimen length-diameter ratio using correction factors provided in the section on calculation of Test Method C42/C42M.
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 June 1, 2004. Published July 2004. Originally approved in 1977. Last previous edition approved in 1999 as C873–99. DOI:
10.1520/C0873_C0873M-04E01.
e1
Current edition approved June 15, 2010. Published July 2010. Originally approved in 1977. Last previous edition approved in 2004 as C873/C873M–04 . DOI:
10.1520/C0873_C0873M-10.
2
Section on Safety Precautions, Manual of Aggregate and Concrete Testing, Annual Book of ASTM Standards, Vol 04.02.
3
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book ofASTM 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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