ASTM C1542/C1542M-14

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Designation: C1542/C1542M − 14
StandardTest Method for
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Measuring Length of Concrete Cores
This standard is issued under the fixed designation C1542/C1542M; 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.
1. Scope* is used in conjunction with length to diameter relationships,
condition surveys, absorption, density and voids analysis,
1.1 This test method is used to determine the length of a
petrography, cement content analysis, and other applications. It
core drilled from concrete.
does not meet requirements for determining the distance
1.2 The values stated in either SI units or inch-pound units
between two parallel surfaces, which represents the thickness
are to be regarded separately as standard. Within the text, the
of a structural element often used to establish compliance with
inch-pound units are shown in brackets. The values stated in
design specifications as outlined by Test Method C174.
each system are not exact equivalents; therefore, each system
shall be used independently of the other.
5. Apparatus
1.3 This standard does not purport to address all of the
5.1 Jaw Caliper, minimum depth of jaw 65 mm [2.5 in.].
safety concerns, if any, associated with its use. It is the
Measuring range 0 to 300 mm [0 to 12 in.]. Accuracy to 0.03
responsibility of the user of this standard to establish appro-
mm [0.001 in.].
priate safety and health practices and determine the applica-
5.1.1 Offset points as part of caliper accessory kit to permit
bility of regulatory limitations prior to use.
length measurements at points not on the core perimeter.
2. Referenced Documents
5.2 Ruler, 300 to 380 mm [12 to 15 in.] divided into 1 mm
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2
[ ⁄16 or 0.1 in.] graduations.
2.1 ASTM Standards:
C42/C42M Test Method for Obtaining and Testing Drilled
6. Procedure
Cores and Sawed Beams of Concrete
C125 Terminology Relating to Concrete and Concrete Ag-
6.1 Jaw Caliper Procedure:
gregates
6.1.1 Attach offset points to caliper jaws and initialize zero
C174 Test Method for Measuring Thickness of Concrete
reading.
Elements Using Drilled Concrete Cores
6.1.2 Hold the specimen and place the open jaws of the
C670 Practice for Preparing Precision and Bias Statements
caliper midpoint between the center and edge of the specimen.
for Test Methods for Construction Materials
Measure and record the value to the nearest 0.25 mm [0.01 in.].
Rotate the specimen 90º, 180º, and 270º and repeat procedure.
3. Terminology
Obtain one measurement along the axis of the specimen and
3.1 Definitions:
record.
3.1.1 For definitions of terms used in this test method, refer
6.2 Ruler Procedure:
to Terminology C125.
6.2.1 Position core with finished or formed face placed
down against flat and level surface. Place ruler on flat surface
4. Significance and Use
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against side of core and measure length to nearest 1 mm [ ⁄16 or
4.1 This test method provides two procedures for determin-
0.05 in.] and record. Rotate core and repeat measurements at
ing the length of a core as measured along its axis. This length
approximately 90º, 180º, and 270º.
NOTE 1—This procedure does not intend to include in the length
measurement adhered pieces of material not part of the original concrete
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This test method is under the jurisdiction of ASTM Committee C09 on
mixture.
Concrete and ConcreteAggregates and is the direct responsibility of Subcommittee
C09.61 on Testing for Strength.
7. Report
Current edition approved July 1, 2014. Published July 2014. Originally approved
in 2002. Last previous edition approved in 2010 as C1542/C1542M – 02 (2010).
7.1 Jaw Caliper—Average five measurements and report to
DOI: 10.1520/C1542_C1542M-14.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or nearest 1 mm [0.05 in.].
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
7.2 Ruler—Average four measurements and report to near-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. est 1 mm [0.05 in.].
*A Summary of Changes section appears at the end of this standard
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C1542/C1542M − 14
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8. Precision and Bias The between-laboratory coefficient of variation (1S %) has
been found to be 1.60 %, therefore, two measures of the same
8.1 Precision:
core by two different laboratories should not differ by more
8.1.1 With-and between-lab precision of the jaw caliper and
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than 4.23 % (D2S %) of the mean length of the core.
ruler procedures was estim
...