ASTM D4543-07
(Practice)Standard Practices for Preparing Rock Core as Cylindrical Test Specimens and Verifying Conformance to Dimensional and Shape Tolerances
Standard Practices for Preparing Rock Core as Cylindrical Test Specimens and Verifying Conformance to Dimensional and Shape Tolerances
SIGNIFICANCE AND USE
The dimensional, shape, and surface tolerances of rock core specimens are important for determining rock properties of intact specimens. Dimensional and surface tolerance checks are required in Test Methods D 7012 and D 7070. To simplify test procedures in laboratories, the parts of those procedures that are common to the test methods are given in this standard.
Note 2—The quality of the result produced by this standard is dependent upon the competence of the personnel performing it, and the suitability of the equipment and facilities used. Agencies that meet the criteria of Practice D 3740 are generally considered capable of competent and objective testing and sampling. Users of this standard are cautioned that compliance with Practice D 3740 does not in itself assure reliable results. Reliable results depend on many factors; Practice D 3740 provides a means of evaluating some of those factors
SCOPE
1.1 This practice specifies procedures for laboratory rock core test specimen preparation of rock core from drill core and block samples for strength and deformation testing and for determining the conformance of the test specimen dimensions with tolerances established by this practice. Cubical, rectangular, or other shapes are not covered by this practice. However, some of the information contained with in this practice and in standard Test Method C 170 may still be of use to preparing other test specimen shapes.
1.2 Rock is a complex engineering material that can vary greatly as a function of lithology, stress history, weathering, moisture content and chemistry, and other natural geologic processes. As such, it is not always possible to obtain or prepare rock core specimens that satisfy the desirable tolerances given in this practice. Most commonly, this situation presents itself with weaker, more porous, and poorly cemented rock types and rock types containing significant and/or weak structural features. For these and other rock types which are difficult to prepare, all reasonable efforts shall be made to prepare a specimen in accordance with this practice and for the intended test procedure. However, when it has been determined by trial that this is not possible, prepare the rock specimen to the closest tolerances practicable and consider this to be the best effort (Note 1) and report it as such and if allowable or necessary for the intended test, capping the ends of the specimen as discussed in this practice is permitted.
Note 1—Best effort in surface preparation refers to the use of a well-maintained surface grinder, lathe or lapping machine by an experienced operator in which a reasonable number of attempts has been made to meet the tolerances required in this procedure.
1.3 This practices covers some, but not all of the curatorial issues that should be implemented. For curatorial issues that should be followed before and during specimen preparation refer to Practices D 5079 and to the specific test standards in section 2.1 for which the specimens are being prepared.
1.4 This practice also prescribes tolerance checks on the length-to-diameter ratio, straightness of the elements on the cylindrical surface, the flatness of the end bearing surfaces, and the perpendicularity of the end surfaces with the axis of the core.
1.5 The requirement for specifying the moisture condition of the test specimen is also stated. However, the requirements in the specific test standards in section 2.1 should be followed too.
1.6 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D 6026, unless superseded by this standard.
1.6.1 The practices /procedures used to specify how data are collected/recorded and calculated in this standard are regarded as the industry standard. In addition, they are representative of the significant digits that generally should be retained. The procedures used do not consider material variation, pu...
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Designation:D4543–07
Standard Practices for
Preparing Rock Core as Cylindrical Test Specimens and
Verifying Conformance to Dimensional and Shape
1
Tolerances
This standard is issued under the fixed designation D 4543; 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 (e) indicates an editorial change since the last revision or reapproval.
enced operator in which a reasonable number of attempts has been made
1. Scope*
to meet the tolerances required in this procedure.
1.1 This practice specifies procedures for laboratory rock
1.3 This practices covers some, but not all of the curatorial
core test specimen preparation of rock core from drill core and
issues that should be implemented. For curatorial issues that
block samples for strength and deformation testing and for
should be followed before and during specimen preparation
determining the conformance of the test specimen dimensions
refer to Practices D 5079 and to the specific test standards in
with tolerances established by this practice. Cubical, rectangu-
section 2.1 for which the specimens are being prepared.
lar, or other shapes are not covered by this practice. However,
1.4 This practice also prescribes tolerance checks on the
some of the information contained with in this practice and in
length-to-diameter ratio, straightness of the elements on the
standard Test Method C 170 may still be of use to preparing
cylindricalsurface,theflatnessoftheendbearingsurfaces,and
other test specimen shapes.
the perpendicularity of the end surfaces with the axis of the
1.2 Rock is a complex engineering material that can vary
core.
greatly as a function of lithology, stress history, weathering,
1.5 The requirement for specifying the moisture condition
moisture content and chemistry, and other natural geologic
of the test specimen is also stated. However, the requirements
processes. As such, it is not always possible to obtain or
in the specific test standards in section 2.1 should be followed
prepare rock core specimens that satisfy the desirable toler-
too.
ances given in this practice. Most commonly, this situation
1.6 All observed and calculated values shall conform to the
presents itself with weaker, more porous, and poorly cemented
guidelines for significant digits and rounding established in
rock types and rock types containing significant and/or weak
Practice D 6026, unless superseded by this standard.
structural features. For these and other rock types which are
1.6.1 Thepractices/proceduresusedtospecifyhowdataare
difficult to prepare, all reasonable efforts shall be made to
collected/recorded and calculated in this standard are regarded
prepare a specimen in accordance with this practice and for the
as the industry standard. In addition, they are representative of
intendedtestprocedure.However,whenithasbeendetermined
the significant digits that generally should be retained. The
by trial that this is not possible, prepare the rock specimen to
procedures used do not consider material variation, purpose for
the closest tolerances practicable and consider this to be the
obtaining the data, special purpose studies, or any consider-
best effort (Note 1) and report it as such and if allowable or
ations for the user’s objectives; and it is common practice to
necessary for the intended test, capping the ends of the
increase or reduce significant digits of reported data to be
specimen as discussed in this practice is permitted.
commensuratewiththeseconsiderations.Itisbeyondthescope
NOTE 1—Best effort in surface preparation refers to the use of a
of this standard to consider significant digits used in analysis
well-maintained surface grinder, lathe or lapping machine by an experi-
methods for engineering design.
1.7 Units—The dimensional values stated in either inch-
pound units or SI units are to be regarded as standard, such as
1
ThesepracticesareunderthejurisdictionofASTMCommitteeD18onSoiland
4 to 12 in. or 100 to 300 mm. The values stated in each system
Rock and is the direct responsibility of Subcommittee D18.12 on Rock Mechanics.
may not be exact equivalents; therefore, each system shall be
Current edition approved Feb. 15, 2007. Published April 2007. Originally
approved in 1985. Last previous edition approved in 2004 as D 4543 – 04 used independently of the other. Combining values from the
*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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D4543–07
two systems may result in non-conformance with the standard. 4. Significance and Use
(Note, when mas
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