ASTM C174/C174M-12
(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
SIGNIFICANCE AND USE
This test method is used to determine the compliance of concrete construction with design specifications. It is especially important in determining the thickness of pavements and other slab construction.
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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Designation: C174/C174M − 12 AmericanAssociation State
Highway and Transportation Officials Standard
AASHTO No.: T 148
Standard Test Method for
Measuring Thickness of Concrete Elements Using Drilled
1
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* 3.2 The apparatus shall be so designed that the specimen
will be held with its axis in a vertical position by three
1.1 This test method covers the determination of the thick-
symmetrically placed supports bearing against the lower end.
ness of a concrete pavement, slab, or structural element by
These supports shall be short posts or studs of hardened steel,
measuring the length of a core drilled from a concrete
and the ends that bear against the surface of the specimen shall
structure.
1
be rounded to a radius of not less than 6 mm [ ⁄4 in.] and not
1.2 The values stated in either SI units or inch-pound units
1
more than 13 mm [ ⁄2 in.].
are to be regarded separately as standard. Within the text, the
3.3 The apparatus shall provide for the accommodation of
inch-pound units are shown in brackets. The values stated in
specimens of different nominal lengths over a range of at least
each system are not exact equivalents; therefore, each system
100 to 250 mm [4 to 10 in.].
shall be used independently of the other.
3.4 The calipering device shall be so designed that it will be
1.3 This standard does not purport to address all of the
possible to make a length measurement at the center of the
safety concerns, if any, associated with its use. It is the
upper end of the specimen, and at eight additional points
responsibility of the user of this standard to establish appro-
spaced at equal intervals along the circumference of a circle
priate safety and health practices and determine the applica-
whose center point coincides with that of the end area of the
bility of regulatory limitations prior to use.
specimen and whose radius is not less than one half nor more
2. Significance and Use than three fourths of the radius of the specimen.
2.1 This test method is used to determine the compliance of 3.5 The measuring rod or other device that makes contact
with the end surface of the specimen for measurement shall be
concrete construction with design specifications. It is espe-
1
cially important in determining the thickness of pavements and rounded to a radius of 3 mm [ ⁄8 in.]. The scale on which the
length readings are made shall be marked with clear, definite,
other slab construction.
accurately spaced graduations. The spacing of the graduations
3. Apparatus
shall be 1.0 mm [0.10 in.] or a decimal part thereof.
3.1 The apparatus shall consist of a 3-point calipering
3.6 The apparatus shall be stable and sufficiently rigid to
device that will measure the length of axial elements of the
maintain its shape and alignment without a distortion or
core. While the details of the mechanical design are not
deflection of more than 0.25 mm [0.01 in.] during all normal
prescribed, the apparatus shall conform to the requirements of
measuring operations.
2
3.2 to 3.6. An example of the apparatus is illustrated in Fig. 1.
4. Test Specimens
4.1 Cores used as specimens for length measurement shall
1
This test method is under the jurisdiction of ASTM Committee C09 on
be in every way representative of the concrete in the structure
Concrete and Concrete Aggregatesand is the direct responsibility of Subcommittee
C09.69 on Miscellaneous Tests.
from which they are removed. The specimen shall be drilled
Current edition approved July 1, 2012. Published September 2012. Originally
with the axis normal to the surface of the structure, and the
approved in 1942. Last previous edition approved in 2006 as C174/C174M–06.
ends shall be free from all conditions not typical of the surfaces
DOI: 10.1520/C0174_C0174M-12.
2
of the structure. Cores that show abnormal defects or that have
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
been damaged appreciably in the drilling operation shall not be
of Measurement of the Length of Cores Drilled from Concrete Structures,” prepared
used. If a core drilled from a pavement or structure placed on
by L. W. Teller for Subcommittee VII on Methods and Apparatus for Testing
dense-graded aggregate base course includes particles of the
Concrete, of Committee C09, see Proceedings,Am. Soc. Testing Mats
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
American Association State
Designation:C174/C174M–06 Designation: C174/C174M – 12 Highway and Transportation Officials Standard
AASHTO No.: T 148
Standard Test Method for
Measuring Thickness of Concrete Elements Using Drilled
1
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 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.
2. Significance and Use
2.1 This test method is used to determine the compliance of concrete construction with design specifications. It is especially
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
2
the details of the mechanical design are not prescribed, the apparatus shall conform to the requirements of 3.2 to 3.6. An example
of the apparatus is illustrated in Fig. 1.
3.2 The apparatus shall be so designed that the specimen will be held with its axis in a vertical position by three symmetrically
placed supports bearing against the lower end.These supports shall be short posts or studs of hardened steel, and the ends that bear
1 1
against the surface of the specimen shall be rounded to a radius of not less than 6 mm [ ⁄4 in.] and not more than 13 mm [ ⁄2 in.].
3.3 The apparatus shall provide for the accommodation of specimens of different nominal lengths over a range of at least 100
to 250 mm [4 to 10 in.].
3.4 The calipering device shall be so designed that it will be possible to make a length measurement at the center of the upper
end of the specimen, and at eight additional points spaced at equal intervals along the circumference of a circle whose center point
coincides with that of the end area of the specimen and whose radius is not less than one half nor more than three fourths of the
radius of the specimen.
3.5 The measuring rod or other device that makes contact with the end surface of the specimen for measurement shall be
1
rounded to a radius of 3 mm [ ⁄8 in.]. The scale on which the length readings are made shall be marked with clear, definite,
accurately spaced graduations. The spacing of the graduations shall be 1.0 mm [0.10 in.] or a decimal part thereof.
3.6 The apparatus shall be stable and sufficiently rigid to maintain its shape and alignment without a distortion or deflection of
more than 0.25 mm [0.01 in.] during all normal measuring operations.
4. Test Specimens
4.1 Cores used as specimens for length measurement shall be in every way representative of the concrete in the structure from
which they are removed. The specimen shall be drilled with the axis normal to the surface of the structure, and the ends shall be
1
This test method is under the jurisdiction of ASTM Committee C09 on Concrete and Concrete Aggregates and is the direct responsibility of Subcommittee C09.69 on
Miscellaneous Tests.
Current edition approved Feb.July 1, 2006.2012. Published February 2006.September 2012. Originally approved in 1942. Last previous edition approved in 19972006 as
C174/C174M–97.C174/C174M–06. DOI: 10.1520/C0174_C0174M-0612.
2
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 of
Measurement of the Length of Cores Drilled from Concrete Structures,” prepared by L. W. Teller for Subcommittee VII on Methods and Apparatus for Testing Concrete,
of Committee C09, s
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