ASTM C1604/C1604M-05(2012)
(Test Method)Standard Test Method for Obtaining and Testing Drilled Cores of Shotcrete
Standard Test Method for Obtaining and Testing Drilled Cores of Shotcrete
SIGNIFICANCE AND USE
4.1 This test method provides standardized procedures for obtaining cored specimens to determine the compressive strength and splitting tensile strength of shotcrete during pre-construction, during construction, and from older shotcrete structures.
4.2 Generally, test specimens are obtained in situ when doubt exists about the in-place shotcrete quality due either to low strength test results during construction or signs of distress in the structure. Other uses of this method are to provide specimens for acceptance testing, construction control and to assess the condition, quality and uniformity of the shotcrete in accordance with Practice C823 (see Note 1).
4.3 Specimens obtained by this method are used to verify the thickness of shotcrete and aid in the visual assessment of the shotcrete quality, workmanship, defects, shotcrete-to-substrate bond and the condition of any reinforcement used in the shotcrete4.
4.4 Shotcrete strength is affected by the location of the shotcrete in a structure. Vertical, sub-horizontal and overhead elements of the shotcrete structure may show variability. Core strength is affected by core orientation relative to direction of shotcrete application. These factors shall be considered in planning the locations for obtaining shotcrete samples and in interpreting strength test results.
4.5 Shotcrete is applied in single or multiple layers, as plain shotcrete, reinforced shotcrete, or fiber-reinforced shotcrete. Core samples containing wire-mesh and reinforcing bars shall not be used for compressive strength testing.
4.6 The strength of shotcrete is affected by moisture content, the specified moisture conditioning procedure for cores is intended to provide test specimens with reproducible moisture contents that minimize within-laboratory and between-laboratory variations.
4.7 Sample acquisition may require a combination of core-drilling, sawing, and grinding that may have the potential to adversely affect the sample conditio...
SCOPE
1.1 This test method covers obtaining, preparing, and testing cores drilled from shotcrete for length, compressive strength, or splitting tensile strength determinations.
1.2 The values stated in either inch-pound units or SI units shall be regarded separately as standard. SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.
1.3 The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.
1.4 This standard does not purport to address 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.
General Information
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Standards Content (Sample)
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Designation: C1604/C1604M − 05 (Reapproved 2012)
Standard Test Method for
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Obtaining and Testing Drilled Cores of Shotcrete
This standard is issued under the fixed designation C1604/C1604M; 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 C670 Practice for Preparing Precision and Bias Statements
for Test Methods for Construction Materials
1.1 This test method covers obtaining, preparing, and test-
C823 Practice for Examination and Sampling of Hardened
ing cores drilled from shotcrete for length, compressive
Concrete in Constructions
strength, or splitting tensile strength determinations.
C1140 Practice for Preparing and Testing Specimens from
1.2 The values stated in either inch-pound units or SI units
Shotcrete Test Panels
shall be regarded separately as standard. SI units are shown in
C1231/C1231M Practice for Use of Unbonded Caps in
brackets. The values stated in each system may not be exact
DeterminationofCompressiveStrengthofHardenedCon-
equivalents; therefore, each system must be used indepen-
crete Cylinders
dently of the other. Combining values from the two systems
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2.2 ACI Standards:
may result in nonconformance with the standard.
318 Building Code Requirements for Structural Concrete
1.3 The text of this standard references notes and footnotes
506.2 Specification for Shotcreting
that provide explanatory material. These notes and footnotes
506.4R Guide for the Evaluation of Shotcrete
(excluding those in tables and figures) shall not be considered
as requirements of the standard.
3. Terminology
1.4 This standard does not purport to address the safety
3.1 For definitions of terms used in this standard, refer to
concerns, if any, associated with its use. It is the responsibility
Terminology C125.
of the user of this standard to establish appropriate safety and
health practices and determine the applicability of regulatory
4. Significance and Use
limitations prior to use.
4.1 This test method provides standardized procedures for
obtaining cored specimens to determine the compressive
2. Referenced Documents
2 strength and splitting tensile strength of shotcrete during
2.1 ASTM Standards:
pre-construction, during construction, and from older shotcrete
C39/C39M Test Method for Compressive Strength of Cylin-
structures.
drical Concrete Specimens
C42/C42M Test Method for Obtaining and Testing Drilled 4.2 Generally, test specimens are obtained in situ when
Cores and Sawed Beams of Concrete doubt exists about the in-place shotcrete quality due either to
C125 Terminology Relating to Concrete and Concrete Ag- low strength test results during construction or signs of distress
gregates in the structure. Other uses of this method are to provide
C174/C174M Test Method for MeasuringThickness of Con- specimens for acceptance testing, construction control and to
crete Elements Using Drilled Concrete Cores assess the condition, quality and uniformity of the shotcrete in
C496/C496M Test Method for Splitting Tensile Strength of accordance with Practice C823 (see Note 1).
Cylindrical Concrete Specimens
4.3 Specimens obtained by this method are used to verify
C617 Practice for Capping Cylindrical Concrete Specimens
the thickness of shotcrete and aid in the visual assessment of
the shotcrete quality, workmanship, defects, shotcrete-to-
substrate bond and the condition of any reinforcement used in
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This test method is under the jurisdiction of ASTM Committee C09 on
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the shotcrete.
Concrete and ConcreteAggregates and is the direct responsibility of Subcommittee
C09.46 on Shotcrete.
Current edition approved April 1, 2012. Published November 2012. Originally
approved in 2005. Last previous edition approved in 2005 as C1604/C1604M–05.
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DOI: 10.1520/C1604_C1604M-05R12. Available fromAmerican Concrete Institute (ACI), P.O. Box 9094, Farmington
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or Hills, MI 48333-9094, http://www.concrete.org.
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contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Bartlett, F. M., and MacGregor, J. G., “Effect of Core Diameter on Concrete
Standards volume information, refer to the standard’s Document Summary page on Core Strengths,” ACI Materials Journal, Vol 91, No. 5, September–October 1994,
the ASTM website. pp. 460–470.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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C1604/C1604M − 05 (2012)
4.4 Shotcrete strength is affected by the location of the 6.1.1 Sampling shall be planned in accordance with the
shotcre
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