ASTM C973-87(2009)
(Practice)Standard Practice for Preparing Test Specimens From Basic Refractory Gunning Products by Pressing
Standard Practice for Preparing Test Specimens From Basic Refractory Gunning Products by Pressing
SIGNIFICANCE AND USE
This practice defines a procedure that ensures consistent preparation of specimens for product testing and evaluation.
This practice can be used in the laboratories of producers, users, and general-interest parties for research and development or quality-control work. It is particularly useful for interlaboratory comparisons on products, for repetitive evaluations or comparisons of products or product equality, and in specifying a uniform preparation practice for specimens for acceptance testing.
In using this practice, it must be recognized that the structure of laboratory-pressed specimens may differ significantly from the structure of material gunned in field applications.
SCOPE
1.1 This practice covers a procedure for preparing test specimens from basic refractory gunning products by pressing prepared material in a mold. After pressing, test specimens prepared from dolomitic mixes are subjected to a prescribed heat treatment. Specimens prepared in accordance with this procedure are intended for use in ASTM test methods.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.3 This standard does not purport to address all of the safety problems, 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.
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: C973 − 87 (Reapproved 2009)
StandardPractice for
Preparing Test Specimens From Basic Refractory Gunning
1
Products by Pressing
This standard is issued under the fixed designation C973; 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 3.3 Steel Molds.
1.1 This practice covers a procedure for preparing test 3.4 Furnace.
specimens from basic refractory gunning products by pressing
3.5 Oven, air-circulating.
prepared material in a mold. After pressing, test specimens
3.6 Desiccator.
prepared from dolomitic mixes are subjected to a prescribed
heat treatment. Specimens prepared in accordance with this
3.7 Trowel.
procedure are intended for use in ASTM test methods.
4. Procedure
1.2 The values stated in inch-pound units are to be regarded
4.1 Store the material to be tested at 85 6 2°F (29.5 6 1°C)
as standard. The values given in parentheses are mathematical
for 24 h prior to testing. Dolomitic materials should be stored
conversions to SI units that are provided for information only
in airtight containers.
and are not considered standard.
4.2 Reduce the sample to the desired batch size with a
1.3 This standard does not purport to address all of the
sample splitter or by quartering taking precautions to prevent
safety problems, if any, associated with its use. It is the
segregation. Sufficient material should be batched to provide at
responsibility of the user of this standard to establish appro-
least a 10 % excess over test specimen requirements.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
4.3 Add the weighed, dry batch to the mixer and dry-mix at
low speed for 30 s. Continue to mix at low speed while adding
2. Significance and Use
the required amount of water (see 4.3.1) within 30 s. Wet-mix
2.1 This practice defines a procedure that ensures consistent
at low speed for 3 min.
preparation of specimens for product testing and evaluation.
4.3.1 Use the amount of water and mixing time (if different
from above) recommended by the manufacturer. The water
2.2 This practice can be used in the laboratories of
must be potable and at a temperature of 85 6 2°F (29.5 6
producers, users, and general-interest parties for research and
1°C). Measure the water addition to the nearest 0.1 % by
development or quality-control work. It is particularly useful
weight.
for interlaboratory comparisons on products, for repetitive
evaluations or comparisons of products or product equality,
4.4 Specimens of the desired size should be pressed imme-
and in specifying a uniform preparation practice for specimens
diately after the batch is mixed. Weigh the proper amount of
for acceptance testing.
material (see 4.4.1) for each specimen to the nearest 0.02 lb (10
g), and distribute the mix uniformly in the mold using the
2.3 In using this practice, it must be recognized that the
narrow edge of a trowel. (The remainder of the batch should be
structure of laboratory-pressed specimens may differ signifi-
covered with a damp cloth during the pressing procedure).
cantly from the structure of m
...
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