ASTM C974-87(2004)
(Practice)Standard Practice for Preparing Test Specimens from Basic Refractory Castable Products by Casting
Standard Practice for Preparing Test Specimens from Basic Refractory Castable Products by Casting
SCOPE
1.1 This practice covers a procedure for preparing test specimens from a basic refractory castable by casting prepared material in a mold. Specimens prepared in accordance with this procedure are intended for use in ASTM test methods.
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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Designation:C 974–87(Reapproved2004)
Standard Practice for
Preparing Test Specimens from Basic Refractory Castable
Products by Casting
This standard is issued under the fixed designation C 974; 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. Procedure
1.1 This practice covers a procedure for preparing test 4.1 Store the material to be tested at 85 6 2°F (29.5 6 1°C)
specimens from a basic refractory castable by casting prepared for 24 h prior to testing.
material in a mold. Specimens prepared in accordance with this 4.2 Reduce the sample to the desired batch size with a
procedure are intended for use in ASTM test methods. sample splitter or by quartering, taking precautions to prevent
1.2 This standard does not purport to address all of the segregation. Sufficient material should be batched to provide at
safety problems, if any, associated with its use. It is the least a 10 % excess over test specimen requirements.
responsibility of the user of this standard to establish appro- 4.3 Add the weighed, dry batch to the mixer and dry-mix at
priate safety and health practices and determine the applica- low speed for 30 s. Continue to mix at low speed while adding
bility of regulatory limitations prior to use. the required amount of water (see 4.3.1) within 30 s. Wet-mix
at low speed for 4 min.
2. Significance and Use
4.3.1 Use the amount of water and mixing time (if different
2.1 This practice defines a procedure that ensures consistent
from above) recommended by the manufacturer. The water
preparation of specimens for product testing and evaluation. must be potable and at a temperature of 85 6 2°F (29.5 6
2.2 This practice can be used in the laboratories of produc-
1°C). Measure the water addition to the nearest 0.1 % by
ers, users, and general-interest parties for research and devel- weight.
opment or quality-control work. It is particularly useful for
4.4 Specimens should be cast in a mold immediately after
interlaboratory comparisons or products, for repetitive evalua- the batch is mixed so that all specimens made from a batch are
tions or comparisons of products or product quality, and in
cast at the same time. The mold should be securely clamped to
specifying a uniform preparation practice for specimens for
thevibrationtabletop.Fillthemoldtooverflowingdistributing
acceptance testing. the material uniformly between each cavity. Vibrate in accor-
2.3 In using this practice it must be recognized that the
dance with the manufacturer’s instructions. Approxim
...
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