ASTM C903-15(2020)
(Practice)Standard Practice for Preparing Refractory Specimens by Cold Gunning
Standard Practice for Preparing Refractory Specimens by Cold Gunning
SIGNIFICANCE AND USE
3.1 The properties of refractories can be affected by their method of installation. This practice attempts to minimize the variables encountered during installation by pneumatic gunning.
3.2 This practice provides parameters to produce gunned specimens for use in other ASTM test methods.
3.3 This practice may be used to produce specimens for acceptance testing, service evaluation, manufacturing control, and research and development.
3.4 Differences between various kinds of equipment and the differences in procedures and operator techniques may result in significant variations in the physical properties of the gunned specimens. It is recommended that the same operator use the same equipment to produce specimens for referee testing agreed to by the involved testing parties. The specific operating parameters should be shown in the report.
3.5 Although this practice is specifically designed for refractories containing calcium aluminate cement, it may be used with minor modifications for gun mixes containing other bond systems.
SCOPE
1.1 This practice covers a procedure for preparing refractory specimens usually containing calcium aluminate cement with or without metal fibers by cold nozzle-mix gunning. Specimens prepared in accordance with this practice are intended for use in standard ASTM test methods required for evaluating gunned materials.
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
Relations
Standards Content (Sample)
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: C903 − 15 (Reapproved 2020)
Standard Practice for
Preparing Refractory Specimens by Cold Gunning
This standard is issued under the fixed designation C903; 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 3.2 This practice provides parameters to produce gunned
specimens for use in other ASTM test methods.
1.1 Thispracticecoversaprocedureforpreparingrefractory
specimens usually containing calcium aluminate cement with 3.3 This practice may be used to produce specimens for
orwithoutmetalfibersbycoldnozzle-mixgunning.Specimens acceptance testing, service evaluation, manufacturing control,
prepared in accordance with this practice are intended for use and research and development.
in standardASTM test methods required for evaluating gunned
3.4 Differences between various kinds of equipment and the
materials.
differences in procedures and operator techniques may result in
1.2 The values stated in inch-pound units are to be regarded significant variations in the physical properties of the gunned
as standard. The values given in parentheses are mathematical specimens. It is recommended that the same operator use the
conversions to SI units that are provided for information only same equipment to produce specimens for referee testing
and are not considered standard. agreed to by the involved testing parties.The specific operating
parameters should be shown in the report.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
3.5 Although this practice is specifically designed for re-
responsibility of the user of this standard to establish appro-
fractories containing calcium aluminate cement, it may be used
priate safety, health, and environmental practices and deter-
with minor modifications for gun mixes containing other bond
mine the applicability of regulatory limitations prior to use.
systems.
1.4 This international standard was developed in accor-
4. Apparatus
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the 4.1 Gun, pneumatic nozzle-mix. At least 50 ft (15.2 m) of
Development of International Standards, Guides and Recom- hose should be available. Acceptable nozzle diameters range
mendations issued by the World Trade Organization Technical from 1 to 2 in. (25 to 51 mm).
Barriers to Trade (TBT) Committee.
4.2 Air Compressor, capable of delivering sufficient pres-
sure and volume to adequately move refractory to the gun. The
2. Referenced Documents
3 3
compressorshouldbeabletosupplyatleast250ft (7m )/min.
2.1 ASTM Standards:
4.3 Forms, suitable nonabsorbent type, which will vary in
C401 Classification of Alumina and Alumina-Silicate
size in accordance with the number and size of samples being
Castable Refractories
prepared, but are at minimum 12 by 12 by 4 in. (305 by 305 by
C865 Practice for Firing Refractory Concrete Specimens
100 mm). Forms should be sized to prevent rebound entrap-
ment. The use of ⁄2-in. hardware cloth as sidewalls of the form
3. Significance and Use
allows most of the rebound to pass through.
3.1 The properties of refractories can be affected by their
method of installation. This practice attempts to minimize the 5. Procedure
variables encountered during installation by pneumatic gun-
5.1 Store the refractory to be gunned at 70 to 85 °F (20 to
ning.
27 °C) for 24 h prior to gunning.
5.2 Place the form against a rigid surface at an angle of 80
to 90° to the horizontal.
ThispracticeisunderthejurisdictionofASTMCommitteeC08onRefractories
and is the direct responsibility of Subcommittee C08.09 on Monolithics.
5.3 If recommended by the supplier, predampen the refrac-
Current edition approved Nov. 1, 2020. Published November 2020. Originally
tory by mixing with potable water in a paddle mixer for 1 to
approved in 1979. Last previous edition approved in 2015 as C903 – 15. DOI:
10.1520/C0903-15R20.
5 min or follow manufacturer’s specific instructions. In
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
general, regular (dense) refractories require 2 to 4 % of
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
predampening water and lightweight (insulating) refractories
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. require 5 to 8 %.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C903 − 15 (2020)
NOTE 1—Refractories that contain a high-purity cement may benefit by
5.7 Cut suitably sized lamination-fre
...
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