ASTM C174/C174M-97
(Test Method)Standard Test Method for Measuring Thickness of Concrete Elements Using Drilled Concrete Cores
Standard Test Method for Measuring Thickness of Concrete Elements Using Drilled Concrete Cores
SCOPE
1.1 This test method covers the determination of the thickness of a concrete pavement, slab, or structural element by measuring the length of a core drilled from a concrete structure.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the inch-pound units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other.
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 establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn. Contact ASTM
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American Association State
Designation: C 174/C 174M – 97 Highway and Transportation Officials Standard
AASHTO No.: T 148
Standard Test Method for
Measuring Thickness of Concrete Elements Using Drilled
Concrete Cores
This standard is issued under the fixed designation C 174/C 174M; 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.
1. Scope
1.1 This test method covers the determination of the thick-
ness of a concrete pavement, slab, or structural element by
measuring the length of a core drilled from a concrete
structure.
1.2 The values stated in either SI units or inch-pound units
are to be regarded separately as standard. Within the text, the
inch-pound units are shown in brackets. The values stated in
each system are not exact equivalents; therefore, each system
shall be used independently of the other.
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 establish appro-
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
2. Significance and Use
2.1 This test method is used to determine the compliance of
concrete construction with design specifications. It is espe-
cially important in determining the thickness of pavements and
other slab construction.
3. Apparatus
3.1 The apparatus shall consist of a 3-point calipering
device that will measure the length of axial elements of the
core. While the details of the mechanical design are not
prescribed, the apparatus shall conform to the requirements of
2 3
FIG. 1 Core Measuring Apparatus
3.2to3.6. AnexampleoftheapparatusisillustratedinFig.1.
3.2 The apparatus shall be so designed that the specimen
1 will be held with its axis in a vertical position by three
ThistestmethodisunderthejurisdictionofASTMCommitteeC-9onConcrete
andConcreteAggregatesandisthedirectresponsibilityofSubcommitteeC09.69on symmetrically placed supports bearing against the lower end.
Miscellaneous Tests.
These supports shall be short posts or studs of hardened steel,
CurrenteditionapprovedJan.10,1997.PublishedMarch1997.Originallyissued
and the ends that bear against the surface of the specimen shall
as C 174 – 42 T. Last previous edition C 174 – 87 (1991).
be rounded to a radius of not less than 6 mm [ ⁄4 in.] and not
For further information relating to the development of this test method and
apparatus, reference should be made to the “Project Report on a Study of Methods
more than 13 mm [ ⁄2 in.].
of Measurement of the Length of Cores Drilled from Concrete Structures,” prepared
3.3 The apparatus shall provide for the accommodation of
by L. W. Teller for Subcommittee VII on Methods and Apparatus for Testing
specimens of different nominal lengths over a range of at least
Concrete, of Committee C-9, see Proceedings,Am. Soc. Testing Mats.,ASTM, Vol
100 to 250 mm [4 to 10 in.].
42, 1942.
The sole source of supply of the apparatus known to the committee at this time
3.4 The calipering device shall be so designed that it will be
is Humboldt Mfg. Co., 7300 West Agatite, Norridge, IL 80656-4704, Catalog No.
possible to make a length measurement at the center of the
H-2939. If you are aware of alternative suppliers, please provide this information to
upper end of the specimen, and at eight additional points
ASTMHeadquarters.Yourcommentswillreceivecarefulconsiderationatameeting
of the responsible technical committee, which you may attend. spaced at equal intervals along the circumference of a circle
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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.
C 174/C 174M – 97
whose center point coincides with that of the end area of the When these errors exceed 0.25 mm [0.01 in.], apply suitable
specimen and whose radius is not less than one half nor more corrections to the core length measurements.
than three fourths of the radius of the specimen. 5.2 Place the specimen in the measuring apparatus with the
smoothendofthecore,thatis,theendthatrepresentstheupper
3.5 The measuring rod or other device that makes contact
surface of a pavement slab or a formed surface in the case of
with the end surface of the specimen for measurement shall be
other structures, placed down so as to bear against the three
rounded to
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