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ASTM D 5731 Document Information:
Title
Standard Test Method for Determination of the Point Load Strength Index of Rock and Application to Rock Strength Classifications
ASTM International
Publication Date:
Jan 1, 2008
Scope:
This test method covers the guidelines, requirements, and
procedures for determining the point load strength index of rock.
This is an index test and is intended to be used to classify rock
strength.
Specimens in the form of rock cores, blocks, or irregular lumps
with a test diameter from 30 to 85 mm can be tested by this test
method.
This test method can be performed in either the field or
laboratory. The test is typically used in the field because the
testing machine is portable, little or minimal specimen preparation
is required, and specimens can be tested within a short time frame
of being collected.
This test method applies to medium strength rock (compressive
strength over 15 MPa (2200 psi)).
This test method does not cover which type of specimen should be
tested or whether anisotropic factors should be considered. The
specifics of the point load test program need to be developed prior
to testing and possibly even before sampling. Such specifics would
be dependent on the intended use of the data, as well as possible
budgetary constraints and possible other factors, which are outside
the scope of this test method.
All observed and calculated values shall conform to the
guidelines for significant digits and rounding established in
Practice D 6026.
The method used to specify how data are collected, calculated,
or recorded in this standard is not directly related to the
accuracy to which the data can be applied in design or other uses,
or both. How one applies the results obtained using this standard
is beyond its scope.
The values stated in the SI units are to be regarded as
standard.
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.
*A Summary of Changes section appears at the end of this
standard.
Keywords:
- compressive strength
- index test
- point load
- rock
- rock classification
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