ASTM C174/C174M-06

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American Association State
Designation:C174/C174M–06 Highway and Transportation Officials Standard
AASHTO No.: T 148
Standard Test Method for
Measuring Thickness of Concrete Elements Using Drilled
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Concrete Cores
This standard is issued under the fixed designation C174/C174M; 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*
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
will be held with its axis in a vertical position by three
These supports shall be short posts or studs of hardened steel,
symmetrically placed supports bearing against the lower end.
and the ends that bear against the surface of the specimen shall
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be rounded to a radius of not less than 6 mm [ ⁄4 in.] and not
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1 more than 13 mm [ ⁄2 in.].
This test method is under the jurisdiction of ASTM Committee C09 on
3.3 The apparatus shall provide for the accommodation of
Concrete and ConcreteAggregates and is the direct responsibility of Subcommittee
C09.69 on Miscellaneous Tests.
specimens of different nominal lengths over a range of at least
Current edition approved Feb. 1, 2006. Published February 2006. Originally
100 to 250 mm [4 to 10 in.].
approved in 1942. Last previous edition approved in 1997 as C174/C174M – 97.
DOI: 10.1520/C0174_C0174M-06.
2
For further information relating to the development of this test method and
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apparatus, reference should be made to the “Project Report on a Study of Methods The sole source of supply of the apparatus known to the committee at this time
of Measurement of the Length of Cores Drilled from Concrete Structures,” prepared is Humboldt Mfg. Co., 7300 West Agatite, Norridge, IL 80656-4704, Catalog No.
by L. W. Teller for Subcommittee VII on Methods and Apparatus for Testing H-2939. If you are aware of alternative suppliers, please provide this information to
Concrete, of Committee C09, see Proceedings,Am. Soc. Testing Mats.,ASTM, Vol ASTMHeadquarters.Yourcommentswillreceivecarefulconsiderationatameeting
42, 1942. of the responsible technical committee, which you may attend.
*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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C174/C174M–06
3.4 The calipering device shall be so designed that it will be When these errors exceed 0.25 mm [0.01 in.], apply suitable
possible to make a length measurement at the center of the corrections to the core length measurements.
upper end of the specimen, and at eight additional points 5.2 Place the specimen in the measuring apparatus with the
spaced at equal intervals along the circumference of a circle smoothendofthecore,thatis,theendthatrepresentstheupper
whose center point coincides with that of the end area of the surface of a pavement slab or a formed surface in the case of
specimen and whose radius is not less than one half nor more other structures, placed down so as to bear against the three
than three fourths of the radius of the specimen. hardened-steel supports. So place the specimen on the supports
3.5 The measuring rod or other device that makes cont
...