ASTM C873-99

Standard Test Method for Compressive Strength of Concrete Cylinders Cast in Place in Cylindrical Molds

SCOPE
1.1 This test method covers the determination of strength of cylindrical concrete specimens derived by means of a cast-in-place mold technique using specimens molded in place in the concrete structural slab at the time the structural slab is cast. 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 inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.  
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.

General Information

• Status: Historical
• Publication Date: 09-Jan-1999
• ICS: 91.100.30 - Concrete and concrete products
• Technical Committee: C09 - Concrete and Concrete Aggregates
• Drafting Committee: C09.61 - Testing for Strength

Relations

• Replaced By: ASTM C873-04 - Standard Test Method for Compressive Strength of Concrete Cylinders Cast in Place in Cylindrical Molds
• Effective Date: 01-Jun-2004

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
Designation: C 873 – 99
Standard Test Method for
Compressive Strength of Concrete Cylinders Cast in Place
in Cylindrical Molds
This standard is issued under the fixed designation C 873; 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 (e) 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 formwork prior to placement of the concrete as shown in Fig.
1. The elevation of the mold upper edge is adjusted to
1.1 This test method covers the determination of strength of
correspond to the plane of the finished slab surface. The mold
cylindrical concrete specimens derived by means of a cast-in-
support prevents direct contact of the slab concrete with the
place mold technique using specimens molded in place in the
outside of the mold and permits its easy removal after the
concrete structural slab at the time the structural slab is cast.
concrete has hardened. The mold is filled at the time its
This test method is limited to use in slabs where the depth of
location is reached in the normal course of concrete placement.
concrete is from 5 to 12 in. [125 to 300 mm].
The specimen in the “as-cured” condition is removed from its
1.2 The values stated in either inch-pounds or SI units shall
in-place location immediately prior to de-molding, capping,
be regarded separately as standard. SI units are shown in
and testing. The reported compressive strength is corrected on
brackets. The values stated may not be exact equivalents,
the basis of specimen length to diameter ratio using correction
therefore each system must be used independently of the other.
factors provided in the section on calculation of Test Method
Combining values of the two units may result in nonconfor-
C 42.
mance.
1.3 This standard does not purport to address all of the
4. Significance and Use
safety concerns, if any, associated with its use. It is the
4.1 Cast-in-place cylinder strength relates to the strength of
responsibility of the user of this standard to consult and
concrete in the structure due to the similarity of curing
establish appropriate safety and health practices and deter-
conditions since the cylinder is actually cured within the slab.
mine the applicability of regulatory limitations prior to use.
However, due to differences in moisture condition, degree of
2. Referenced Documents consolidation, specimen size, and length to diameter ratio,
there is not a constant relationship between the strength of
2.1 ASTM Standards:
cast-in-place cylinders and cores. When cores can be drilled
C 39 Test Method for Compressive Strength of Cylindrical
undamaged and tested in the same moisture condition as the
Concrete Specimens
cast-in-place cylinders, the strength of the cylinders can be
C 42 Test Method for Obtaining and Testing Drilled Cores
expected to be on an average 10 % higher than the cores at ages
and Sawed Beams of Concrete
up to 91 days for specimens of the same size and length to
C 470 Specification for Molds for Forming Concrete Test
diameter ratio.
Cylinders Vertically
4.2 Strength of cast-in-place cylinders may be used for
C 617 Practice for Capping Cylindrical Concrete Speci-
various purposes, such as estimating the load-bearing capacity
mens
of slabs, determining the time of form and shore removal, and
C 670 Practice for Preparing Precision and Bias Statements
determining the effectiveness of curing and protection.
for Test Methods for Construction Materials
5. Apparatus
3. Summary of Test Method
5.1 Cast-in-place molds shall have a diameter at least three
3.1 A concrete cylinder mold assembly consisting of a mold
times the nominal maximum aggregate size. The ratio of the
and a tubular support member is fastened within the concrete
length-to-diameter (L/D) of the specimen after capping shall
not be less than 1.0 and should preferably be between 1.5 and
2.0. Molds (inner member) shall be constructed in one piece in
This test method is under the jurisdiction of ASTM Committee C-9 on Concrete
and Concrete Aggregates,and is the direct responsibility of Subcommittee C09.61 on
Testing for Strength.
Current edition approved Jan. 10, 1999. Published May 1999. Originally Bloem, D. L., “Concrete Strength in Structures,” Journal of the American
published as C 873 – 77T. Last previous edition C 873 – 94. Concrete Institute, JACIA, March 1968, or ACI Proceedings, PACIA, Vol. 65, No.
Annual Book of ASTM Standards, Vol 04.02. 3, pp. 169–248.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
C 873
FIG. 1 Schematic of Cast-in-Place Cylinder Mold Assembly
the form of right circular cylinders at least 4 in. [100 mm] in eters measured at right angles to each other in any horizontal
inside diameter with the average diameter not differing from
plane do not differ by more than ⁄16 in. [2.0 mm].
the nominal diameter by more than 1 % and no individual
5.3 The exterior top of the mold shall have outwardly
diameter differing from any other diameter by more than 2 %.
extending centering knobs and an annular flange to rest on top
The plane of the rim of the mold and the bottom shall be
of the support member (5.4) and to seal the annular ring space
perpendicular to the axis of the mold within 0.5° (approxi-
between the mold and that support member. Means for twisting
mately equivalent to ⁄8 in. in 12 in. [3 mm in 300 mm]).
and vertical withdrawal of molds shall be provided in the
5.2 Molds shall be watertight and meet the criteria of the
annular flange (see Fig. 1).
section on water leakage of Specification C 470. Molds and
5.4 Support members shall be right circular cylinders and
auxiliary apparatus shall be made of nonabsorbent material,
shall be rigid tubes of diameter required to accommodate
nonreactive with concrete containing portland or other hydrau-
molds stipulated in 5.1 and to concentrically contact and
lic cements. They shall be sufficiently strong and tough to
support the annular flange of the mold. Support members shall
permit use under normal construction conditions without
be provided with a means for height adjustment and shall be
tearing, crushing, or otherwise deforming when filled with
fresh concrete. They shall resist deformation to the extent that fitted with exterior means to permit nailing or other firm
th
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