ASTM D5121-90(1995)
(Practice)Standard Practice for Preparation of Rock Slabs for Durability Testing
Standard Practice for Preparation of Rock Slabs for Durability Testing
SCOPE
1.1 This practice covers the preparation of rock slabs for various tests used to evaluate any visual internal defects, or the durability of rock by means of laboratory tests. These tests include, but are not limited to, freeze-thaw, wet-dry, and soundness. Note 1—Tests for evaluating the durability of rock for erosion control uses are presently under development by ASTM Committee D-18.
1.2 This standard does not purport to address all of the safety problems 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. For a specific hazards statement, see Section 7.
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Designation: D 5121 – 90 (Reapproved 1995)
Standard Practice for
Preparation of Rock Slabs for Durability Testing
This standard is issued under the fixed designation D 5121; 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.
1. Scope on the surfaces of broken blocks of rock. Such evaluation can
also aid in the selection and location of slabs for testing as
1.1 This practice covers the preparation of rock slabs for
outlined in Practice D 4992. In some cases, the need for further
various tests used to evaluate any visual internal defects, or the
testing or evaluation may be eliminated.
durability of rock by means of laboratory tests. These tests
4.2 The sawing of rock samples will reduce them to a
include, but are not limited to, freeze-thaw, wet-dry, and
suitable size for testing and, in many cases, preserve the natural
soundness.
structure of the internal defects so the samples can be evaluated
NOTE 1—Tests for evaluating the durability of rock for erosion control
by the various durability tests.
uses are presently under development by ASTM Committee D-18.
NOTE 2—Many of the testing procedures used to evaluate the durability
1.2 This standard does not purport to address all of the
of rock for erosion control projects are based on tests used to evaluate
safety concerns associated with its use. It is the responsibility
concrete or road aggregate. These tests utilize specimens roughly equiva-
of the user of this standard to establish appropriate safety and
lent to the size and mass of a 1-in. maximum particle size piece of
health practices and determine the applicability of regulatory concrete aggregate. These specimens are usually obtained by crushing,
breaking with a hammer, or by other percussive means. This size reduction
limitations prior to use. For a specific hazards statement, see
process may eliminate any internal defects or planes of weakness.
Section 7.
Therefore, the small specimen finally tested may not truly represent the
actual behavior of the larger rock mass containing these defects that will
2. Referenced Documents
be used at the construction site.
2.1 ASTM Standards:
4.3 Durability test slabs obtained using this practice will
D 653 Terminology Relating to Soil, Rock, and Contained
generally result in the largest specimens that can be tested
Fluids
effectively by most well-equipped laboratories. Ideally, a test
D 4992 Practice for Evaluation of Rock to be Used for
specimen size equal to the proposed design size would provide
Erosion Control
the ultimate in correlation between laboratory tests and actual
3. Terminology
field performance. However, in most cases, this is neither
practical nor economically feasible.
3.1 Definitions—The definitions of terms used in this prac-
tice shall be in accordance with Terminology D 653.
NOTE 3—As the various rock durability test methods are developed, a
3.2 Definitions of Terms Specific to This Standard:
table listing the slab size required for each test will be included in a
3.2.1 slab, n—a section of rock having two smooth, ap- subsequent revision of this practice.
proximately parallel faces, produced by two saw cuts. The
5. Apparatus
thickness of the slab is generally less than the other dimensions
5.1 Rocksaw—For most tests, a minimum blade diameter of
of the rock. The slab will be the specimen of a rock which will
36 cm (14 in.) will be needed to obtain the slab sizes required
subsequently undergo durability tests.
for most durability tests (a larger one is preferable). The blade
3.2.2 slice, n—in rock testing, the smooth surface of rock
shall be a circular diamond blade. The size of the slab that can
piece produced by the cutting of the rock by a saw.
be obtained by sawing is limited by the blade-stabilizing
3.2.3 rocksaw, n—a saw capable of cutting rock. The term
flanges. Table 1 gives the approximate blade diameter and slab
“saw” shall include the blade, framework on which the blade is
height relationships for saws typically used.
mounted, and the motor.
5.1.1 The saw shall have a vise to hold the specimens, in
4. Significance and Use
addition to an automatic feed (either gravity operated, hydrau-
lic, or screwfed). A table saw with a removable vise is also
4.1 This practice is used to prepare specimens to evaluate
acceptable. The saw shall have a platform to prevent the cut
an
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