ASTM C873/C873M-04e1
(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 since 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 constant relationship between the strength of cast-in-place cylinders and cores. 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 5 to 12 in. [125 to 300 mm].
1.2 The values stated in either inch-pounds or SI units shall be regarded separately as standard. SI units are shown in brackets. The values stated may not be exact equivalents, therefore each system must be used independently of the other. Combining values of the two units may result in nonconformance.
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 to skin and tissue upon prolonged exposure. )
General Information
Relations
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
´1
Designation: C873/C873M – 04
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* 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 5 to
C670 Practice for Preparing Precision and Bias Statements
12 in. [125 to 300 mm].
for Test Methods for Construction Materials
1.2 The values stated in either inch-pounds or SI units shall
be regarded separately as standard. SI units are shown in
3. Summary of Test Method
brackets. The values stated may not be exact equivalents,
3.1 Aconcrete cylinder mold assembly consisting of a mold
therefore each system must be used independently of the other.
and a tubular support member is fastened within the concrete
Combining values of the two units may result in nonconfor-
formwork prior to placement of the concrete as shown in Fig.
mance.
1. The elevation of the mold upper edge is adjusted to
1.3 This standard does not purport to address all of the
correspond to the plane of the finished slab surface. The mold
safety concerns, if any, associated with its use. It is the
support prevents direct contact of the slab concrete with the
responsibility of the user of this standard to consult and
outside of the mold and permits its easy removal from the
establish appropriate safety and health practices and deter-
hardened concrete. The mold is filled at the time its location is
mine the applicability of regulatory limitations prior to use.
reached in the normal course of concrete placement. The
(Warning—Fresh hydraulic cementitious mixtures are caustic
specimen in the “cured-in-place” condition is removed from its
and may cause chemical burns to skin and tissue upon
2 in-place location immediately prior to de-molding, capping,
prolonged exposure. )
and testing. The reported compressive strength is corrected on
2. Referenced Documents the basis of specimen length-diameter ratio using correction
3
factors provided in the section on calculation of Test Method
2.1 ASTM Standards:
C42/C42M.
C39/C39M Test Method for Compressive Strength of Cy-
lindrical Concrete Specimens
4. Significance and Use
4.1 Cast-in-place cylinder strength relates to the strength of
1
This test method is under the jurisdiction of ASTM Committee C09 on
concrete in the structure due to the similarity of curing
Concrete and ConcreteAggregates and is the direct responsibility of Subcommittee
conditionssincethecylinderiscuredwithintheslab.However,
C09.61 on Testing for Strength.
due to differences in moisture condition, degree of consolida-
CurrenteditionapprovedJune1,2004.PublishedJuly2004.Originallyapproved
in 1977. Last previous edition approved in 1999 as C873 – 99. DOI: 10.1520/ tion, specimen size, and length-diameter ratio, there is not a
C0873_C0873M-04E01.
constant relationship between the strength of cast-in-place
2
Section on Safety Precautions, Manual of Aggregate and Concrete Testing,
cylinders and cores. When cores can be drilled undamaged and
Annual Book of ASTM Standards, Vol 04.02.
3
tested in the same moisture condition as the cast-in-place
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
cylinders,thestrengthofthecylinderscanbeexpectedtobeon
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
---------------------- Page: 1 ----------------------
´1
C873/C873M – 04
FIG. 1 Schematic of Cast-in-Place Cylinder Mold Assembly
average 10 % higher than the cores at ages up to 91 days for 5. Apparatus
4
specimens of the same size and length-diameter ratio.
5.1 Cast-in-place molds shall have a di
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.