ASTM D5121-90(2001)
(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:D5121–90(Reapproved 2001)
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 4. Significance and Use
1.1 This practice covers the preparation of rock slabs for 4.1 This practice is used to prepare specimens to evaluate
various tests used to evaluate any visual internal defects, or the any internal defects, such as cracks, that may not be apparent
durability of rock by means of laboratory tests. These tests on the surfaces of broken blocks of rock. Such evaluation can
include, but are not limited to, freeze-thaw, wet-dry, and also aid in the selection and location of slabs for testing as
soundness. outlined in Practice D 4992. In some cases, the need for further
testing or evaluation may be eliminated.
NOTE 1—Tests for evaluating the durability of rock for erosion control
4.2 The sawing of rock samples will reduce them to a
uses are presently under development by ASTM Committee D-18.
suitablesizefortestingand,inmanycases,preservethenatural
1.2 This standard does not purport to address all of the
structureoftheinternaldefectssothesamplescanbeevaluated
safety concerns associated with its use. It is the responsibility
by the various durability tests.
of the user of this standard to establish appropriate safety and
NOTE 2—Many of the testing procedures used to evaluate the durability
health practices and determine the applicability of regulatory
of rock for erosion control projects are based on tests used to evaluate
limitations prior to use. For a specific hazards statement, see
concrete or road aggregate. These tests utilize specimens roughly equiva-
Section 7.
lent to the size and mass of a 1-in. maximum particle size piece of
concrete aggregate. These specimens are usually obtained by crushing,
2. Referenced Documents
breakingwithahammer,orbyotherpercussivemeans.Thissizereduction
2.1 ASTM Standards:
process may eliminate any internal defects or planes of weakness.
Therefore, the small specimen finally tested may not truly represent the
D 653 Terminology Relating to Soil, Rock, and Contained
actual behavior of the larger rock mass containing these defects that will
Fluids
be used at the construction site.
D 4992 Practice for Evaluation of Rock to be Used for
Erosion Control 4.3 Durability test slabs obtained using this practice will
generally result in the largest specimens that can be tested
3. Terminology
effectively by most well-equipped laboratories. Ideally, a test
3.1 Definitions—The definitions of terms used in this prac- specimen size equal to the proposed design size would provide
tice shall be in accordance with Terminology D 653.
the ultimate in correlation between laboratory tests and actual
3.2 Definitions of Terms Specific to This Standard: field performance. However, in most cases, this is neither
3.2.1 slab, n—a section of rock having two smooth, ap-
practical nor economically feasible.
proximately parallel faces, produced by two saw cuts. The
NOTE 3—As the various rock durability test methods are developed, a
thickness of the slab is generally less than the other dimensions
table listing the slab size required for each test will be included in a
of the rock. The slab will be the specimen of a rock which will
subsequent revision of this practice.
subsequently undergo durability tests.
5. Apparatus
3.2.2 slice, n—in rock testing, the smooth surface of rock
piece produced by the cutting of the rock by a saw.
5.1 Rocksaw—For most tests, a minimum blade diameter of
3.2.3 rocksaw, n—a saw capable of cutting rock. The term
36 cm (14 in.) will be needed to obtain the slab sizes required
“saw” shall include the blade, framework on which the blade is
for most durability tests (a larger one is preferable). The blade
mounted, and the motor.
shall be a circular diamond blade. The size of the slab that can
be obtained by sawing is limited by the blade-stabilizing
flanges. Table 1 gives the approximate blade diameter and slab
This practice is under the jurisdiction of ASTM Committee D18 on Soil and
height relationships for saws typically used.
Rock and is the direct responsibility of Subcommittee D18.17 on Rock for Erosion
5.1.1 The saw shall have a vise to h
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