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ASTM C973-87(2020)

(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
2.1 This practice defines a procedure that ensures consistent preparation of specimens for product testing and evaluation.  
2.2 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.  
2.3 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 concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

Status
Published
Publication Date
31-Oct-2020
ICS
81.080 - Refractories
Technical Committee
C08 - Refractories
Drafting Committee
C08.09 - Monolithics
Current Stage
Ref Project

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ASTM C973-87(2020) - Standard Practice for Preparing Test Specimens from Basic Refractory Gunning Products by PressingASTM C973-87(2020) - Standard Practice for Preparing Test Specimens from Basic Refractory Gunning Products by Pressing
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ASTM C973-87(2020) - Standard Practice for Preparing Test Specimens from Basic Refractory Gunning Products by Pressing
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: C973 − 87 (Reapproved 2020)
Standard Practice 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 2.3 In using this practice, it must be recognized that the
structure of laboratory-pressed specimens may differ signifi-
1.1 This practice covers a procedure for preparing test
cantly from the structure of material gunned in field applica-
specimens from basic refractory gunning products by pressing
tions.
prepared material in a mold. After pressing, test specimens
3. Apparatus
prepared from dolomitic mixes are subjected to a prescribed
heat treatment. Specimens prepared in accordance with this
3.1 Mixer, bench-type, Hobart or equivalent.
procedure are intended for use in ASTM test methods.
3.2 Press, mechanical or hydraulic.
1.2 The values stated in inch-pound units are to be regarded
3.3 Steel Molds.
as standard. The values given in parentheses are mathematical
3.4 Furnace.
conversions to SI units that are provided for information only
and are not considered standard. 3.5 Oven, air-circulating.
3.6 Desiccator.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
3.7 Trowel.
responsibility of the user of this standard to establish appro-
4. Procedure
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use. 4.1 Store the material to be tested at 85 6 2 °F (29.5 6
1 °C) for 24 h prior to testing. Dolomitic materials should be
1.4 This international standard was developed in accor-
stored in airtight containers.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
4.2 Reduce the sample to the desired batch size with a
Development of International Standards, Guides and Recom-
sample splitter or by quartering, taking precautions to prevent
mendations issued by the World Trade Organization Technical
segregation. Sufficient material should be batched to provide at
Barriers to Trade (TBT) Committee.
least a 10 % excess over test specimen requirements.
4.3 Add the weighed, dry batch to the mixer and dry-mix at
2. Significance and Use
low speed for 30 s. Continue to mix at low speed while adding
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
2.2 This practice can be used in the laboratories of
from above) recommended by the manufacturer. The water
producers, users, and general-interest parties for research and
must be potable and at a temperature of 85 6 2 °F (29.5 6
development or quality-control work. It is particularly useful
1 °C). Measure the water addition to the nearest 0.1 % by
for interlaboratory comparisons on products, for repetitive
weight.
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
narrow edge of a trowel. (The remainder of the batch should be
1
This practice is under the jurisdiction ofASTM Committee C08 on Refractories
covered with a damp cloth during the pressing procedure.)
and is the direct responsibility of Subcommittee C08.09 on Monolithics.
Press test specimens at 1800 psi (12.41 MPa).
Current edition approved Nov. 1, 2020. Published November 2020. Originally
4.4.1 Some products contain hydratable materials (for
approved in 1982. Last previous edition approved in 2015 as C973 – 87 (2015).
DOI: 10.1520/C0973-87R20. example, dead-burned dolomite) or quick-setting bonds, or
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
C973 − 87 (2020)
both, that tend to react during the course of pressing several in a furnace at 1830 °F (1000 °C) immediately after pressing
specimens from a single wet-mixed batch. Because o
...

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