ASTM C174/C174M-16

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Designation: C174/C174M − 16 American Association State
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 U.S. Department of Defense.
1. Scope* 3. Terminology
1.1 This test method covers the determination of the thick- 3.1 Definitions:
ness of a concrete pavement, slab, or structural element using 3.1.1 For definitions of terms used in this test method, refer
drilling cores. to Terminology C125.
1.2 The values stated in either SI units or inch-pound units
4. Significance and Use
are to be regarded separately as standard. Within the text, the
4.1 This test method is used to determine the compliance of
inch-pound units are shown in brackets. The values stated in
concrete construction with design specifications and is com-
each system are not exact equivalents; therefore, each system
monly used in determining the thickness of pavements and
shall be used independently of the other.
other slab construction. This test method requires that at least
1.3 This standard does not purport to address all of the
one end of the core be a finished or formed surface.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 5. Apparatus
priate safety and health practices and determine the applica-
5.1 The apparatus shall consist of a base plate with three
bility of regulatory limitations prior to use.
posts to support the core in a vertical direction, and top plate or
other means of establishing a plane that is parallel to and a
2. Referenced Documents
measured distance from the plane defined by the supporting
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posts. The apparatus includes a measuring rod as described in
2.1 ASTM Standards:
C42/C42M Test Method for Obtaining and Testing Drilled 5.5 or other means to determine the length of axial elements of
the core. While the details of the mechanical design are not
Cores and Sawed Beams of Concrete
C125 Terminology Relating to Concrete and Concrete Ag- prescribed, the apparatus shall conform to the requirements of
gregates 5.2 – 5.6. An example of an apparatus is illustrated in Fig. 1.
C670 Practice for Preparing Precision and Bias Statements
5.2 The base of the apparatus shall be so designed that the
for Test Methods for Construction Materials
core will be held with its axis in a vertical position by three
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2.2 AASHTO Standards:
symmetrically placed supports bearing against the lower end of
AASHTO T148 Method of Test for Measuring Length of the core. These supports shall be short posts or studs of
Drilled Concrete Cores
hardened steel, and the ends that bear against the surface of the
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core shall be rounded to a radius of not less than 6 mm [ ⁄4 in.]
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and not more than 13 mm [ ⁄2 in.].
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This test method is under the jurisdiction of ASTM Committee C09 on
5.3 The apparatus shall provide for the accommodation of
Concrete and ConcreteAggregates and is the direct responsibility of Subcommittee
cores of different nominal lengths over a range of at least 100
C09.61 on Testing for Strength.
to 250 mm [4 to 10 in.].
CurrenteditionapprovedJune1,2016.PublishedJuly2016.Originallyapproved
in 1942. Last previous edition approved in 2013 as C174/C174M – 13. DOI:
5.4 The top plate or other means of measuring shall be so
10.1520/C0174_C0174M-16.
designed that it will be possible to make a length measurement
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
at the center of the upper end of the core, and at eight
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
additional points spaced at equal intervals along the circum-
the ASTM website.
ference of a circle whose center point coincides with that of the
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Available from American Association of State Highway and Transportation
end area of the core and whose radius is not less than one half
Officials (AASHTO), 444 N. Capitol St., NW, Suite 249, Washington, DC 20001,
http://www.transportation.org. nor more than three fourths of the radius of the core.
*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 − 16
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