ASTM C1542/C1542M-19

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Designation: C1542/C1542M − 16a C1542/C1542M − 19
Standard Test Method for
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*
1.1 This test method is used to determine the length of a core drilled from concrete.
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 necessarily exact equivalents; therefore, to ensure
conformance with the standard, each system shall be used independently of the other.other, and values from the two systems shall
not be combined.
1.3 The text of this standard refers to notes and footnotes that provide explanatory material. These notes and footnotes
(excluding those in tables and figures) shall not be considered as requirements of this standard.
1.4 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
C42/C42M Test Method for Obtaining and Testing Drilled Cores and Sawed Beams of Concrete
C125 Terminology Relating to Concrete and Concrete Aggregates
C174/C174M Test Method for Measuring Thickness of Concrete Elements Using Drilled Concrete Cores
C670 Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials
C1604/C1604M Test Method for Obtaining and Testing Drilled Cores of Shotcrete
3. Terminology
3.1 Definitions:
3.1.1 For definitions of terms used in this test method, refer to Terminology C125.
4. Significance and Use
4.1 This test method provides two procedures for determining the length of a core obtained in accordance with either Test
Method C42/C42M or Test Method C1604/C1604M. This length is used in conjunction with condition surveys, density and voids
analysis, and other applications.
4.2 This procedure does not intend to include in the length measurement adhered particles not part of the concrete mixture.
4.3 Test Method C174/C174M also determines the length of concrete cores using a different measuring apparatus and
procedure.
NOTE 1—Test Method C174/C174M uses an apparatus that establishes two parallel planes a known distance apart. The length of the core is determined
by calculation using the known distance between the two parallel planes and the measured distance from the upper plane to the top of the core.
This test method is under the jurisdiction of ASTM Committee C09 on Concrete and Concrete Aggregates and is the direct responsibility of Subcommittee C09.61 on
Testing for Strength.
Current edition approved June 1, 2016Dec. 1, 2019. Published June 2016January 2020. Originally approved in 2002. Last previous edition approved in 2016 as
C1542/C1542MC1542/C1542M – 16a. – 16. DOI: 10.1520/C1542_C1542M-16A.10.1520/C1542_C1542M-19.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 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 the ASTM website.
*A Summary of Changes section appears at the end of this standard
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C1542/C1542M − 19
5. Apparatus
5.1 Jaw Caliper, minimum depth of jaw 65 mm [2.5 in.]. Measuring range measuring range; 0 to 300 mm [0 to 12 in.]. Accuracy
to 0.02 in.] or greater. Resolution or graduations; 0.01 mm [0.001 in.] or less. Accuracy; 60.03 mm [60.0015 in.] or better.
5.1.1 Offset points as part of caliper accessory kit to permit length measurements at points not on the core perimeter. Minimum
depth of caliper jaws with offset points attached, 64 mm [2.5 in.].
5.2 Ruler, 300 to 380 mm [12 to 15 in.] divided into in.] or greater in length, graduated to 1 mm [ ⁄16 or 0.10.05 in.]
graduations.or less.
6. Test Specimens
6.1 Cores shall be obtained in accordance with Test Method C42/C42M or Test Method C1604/C1604M.
6.2 Cores shall be intact and be free of any coatings.
7. Procedure
7.1 Jaw Caliper Procedure:
7.1.1 Attach offset points to caliper jaws and initialize zero reading.
7.1.2 Hold the specimen and place the open jaws of the caliper midpoint between the center and edge of the specimen. Measure
and record the value to the nearest 0.25 mm [0.01 in.]. Rotate the specimen 90º, 180º, and 270º and repeat procedure. Obtain one
measurement along the axis of the spe
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