ASTM C903-08

Standard Practice for Preparing Refractory Castable Specimens by Cold Gunning

SIGNIFICANCE AND USE
The properties of refractory castables can be affected by their method of installation. This practice attempts to minimize the variables encountered during installation by pneumatic gunning.
This practice provides parameters to produce gunned specimens for use in other ASTM test methods.
This practice may be used to produce specimens for acceptance testing, service evaluation, manufacturing control, and research and development.
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.
Although this practice is specifically designed for refractory castables 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 castable 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 the standard. The values given in parentheses are provided for information only.  
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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 29-Feb-2008
• ICS: 81.080 - Refractories
• Technical Committee: C08 - Refractories
• Drafting Committee: C08.09 - Monolithics

Relations

• Replaces: ASTM C903-98(2004) - Standard Practice for Preparing Refractory Castable Specimens by Cold Gunning
• Effective Date: 01-Mar-2008
• Replaced By: ASTM C903-10 - Standard Practice for Preparing Refractory Castable Specimens by Cold Gunning
• Effective Date: 01-Jan-2010

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information.
Designation:C903–08
Standard Practice for
1
Preparing Refractory Castable 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 specimens. It is recommended that the same operator use the
same equipment to produce specimens for referee testing
1.1 Thispracticecoversaprocedureforpreparingrefractory
agreedtobytheinvolvedtestingparties.Thespecificoperating
castable specimens usually containing calcium aluminate ce-
parameters should be shown in the report.
ment with or without metal fibers by cold nozzle-mix gunning.
3.5 Although this practice is specifically designed for re-
Specimens prepared in accordance with this practice are
fractory castables containing calcium aluminate cement, it may
intended for use in standard ASTM test methods required for
be used with minor modifications for gun mixes containing
evaluating gunned materials.
other bond systems.
1.2 The values stated in inch-pound units are to be regarded
as the standard. The values given in parentheses are provided
4. Apparatus
for information only.
3
4.1 Gun, pneumatic nozzle-mix. At least 50 ft (15.2 m) of
1.3 This standard does not purport to address all of the
hose should be available. Acceptable nozzle diameters range
safety concerns, if any, associated with its use. It is the
from 1 to 2 in. (25 to 51 mm).
responsibility of the user of this standard to establish appro-
4.2 Air Compressor, capable of delivering sufficient pres-
priate safety and health practices and determine the applica-
sure and volume to adequately move castable to the gun. The
bility of regulatory limitations prior to use.
3 3
compressor should be able to supply at least 250 ft (7 m )/min.
2. Referenced Documents 4.3 Forms, suitable nonabsorbent type, which will vary in
2
size in accordance with the number of samples being prepared,
2.1 ASTM Standards:
1
but are typically 36 by 36 by 5 ⁄2 in. (915 by 915 by 140 mm).
C401 Classification of Alumina and Alumina-Silicate
Forms should be sized to prevent rebound entrapment. The use
Castable Refractories
1
of ⁄2 inch hardware cloth as sidewalls of the form allows most
C865 Practice for Firing Refractory Concrete Specimens
of the rebound to pass through. This reduces the size of the
3. Significance and Use form required to achieve the desired standard sized central
portion of 24 by 24 in. (610 by 610 mm).
3.1 The properties of refractory castables can be affected by
4.4 Suitable eye and hand protection must be worn capable
their method of installation.This practice attempts to minimize
of protection against high velocity refractory particles and steel
the variables encountered during installation by pneumatic
fibers.
gunning.
3.2 This practice provides parameters to produce gunned
5. Procedure
specimens for use in other ASTM test methods.
5.1 Store the castable to be gunned at 70 to 85°F (20 to
3.3 This practice may be used to produce specimens for
27°C) for 24 h prior to gunning.
acceptance testing, service evaluation, manufacturing control,
5.2 Oil the forms lightly. Typically 10W-30 oil is used.
and research and development.
Place the form against a rigid surface at an angle of 80 to 90°
3.4 Differences between various kinds of equipment and the
to the horizontal.
differences in procedures and operator techniques may result in
5.3 If recommended by the supplier, predampen the castable
significant variations in the physical properties of the gunned
by mixing with potable water in a paddle mixer for 1 to 5 min
or follow manufacturer’s specific instructions. In general,
regular (dense) castables require 2 to 4 % of predampening
1
ThispracticeisunderthejurisdictionofASTMCommitteeC08onRefractories
water and lightweight (insulating) castables require 5 to 8 %.
and is the direct responsibility of Subcommittee C08.09 on Monolithics.
Current edition approved March 1, 2008. Published April 2008. Originally
NOTE 1—Castables that contain a high-purity cement may benefit by
approved in 1979. Last previous edition approved in 2004 as C903 – 98 (2004).
DOI: 10.1520/C0903-08.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Equipment available from Allentown Equipment Co., 421 Schantz Road,
Standards volume information, refer to the standard’s Document Summary page on Allentown, PA 18104, http://www.allentownequipment.com, has been found suit-
the ASTM website. able for this purpose (Model N-3 or N-2).
Copyright © ASTM International, 100 Barr Harbor Drive,
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:C 903–98 (Reapproved 2004) Designation: C 903 – 08
Standard Practice for
1
Preparing Refractory Castable Specimens by Cold Gunning
This standard is issued under the fixed designation C 903; 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
1.1 This practice covers a procedure for preparing refractory castable 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 the standard. The values given in parentheses are provided for
information only.
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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
C 401 Classification of Alumina and Alumina-Silicate Castable Refractories
C 865 Practice for Firing Refractory Concrete Specimens
3. Significance and Use
3.1 The properties of refractory castables 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 refractory castables containing calcium aluminate cement, it may be used
with minor modifications for gun mixes containing other bond systems.
4. Apparatus
3
4.1 Gun, pneumatic nozzle-mix. At least 50 ft (15.2 m) of hose should be available. Acceptable nozzle diameters range from
1 to 2 in. (25 to 51 mm).
4.2 Air Compressor, capable of delivering sufficient pressure and volume to adequately move castable to the gun. The
3 3
compressor should be able to supply at least 250 ft (7 m )/min.
4.3 Forms, suitable nonabsorbent type, which will vary in size in accordance with the number of samples being prepared, but
1 1
are typically 36 by 36 by 5 ⁄2 in. (915 by 915 by 140 mm). Forms should be sized to prevent rebound entrapment. The use of ⁄2
inch hardware cloth as sidewalls of the form allows most of the rebound to pass through.This reduces the size of the form required
to achieve the desired standard sized central portion of 24 by 24 in. (610 by 610 mm).
1
This practice is under the jurisdiction of ASTM Committee C08 on Refractories and is the direct responsibility of Subcommittee C08.09 on Monolithic Refractories.
Monolithics.
Current edition approved Sept.March 1, 2004.2008. Published October 2004.April 2008. Originally approved in 1979. Last previous edition approved in 19982004 as
C 903 – 98 (2004).
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at [e-mail]. For Annual Book ofASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Equipment available from Allentown Pneumatic Gun Co., P.O. Box 185, Allentown, PA18105, has been found suitable for this purpose (Model N-1 or N-0).
3
Equipment available from Allentown Equipment Co., 421 Schantz Road, Allentown, PA 18104, http://www.allentownequipment.com, has been found suitable for this
purpose (Model N-3 or N-2).
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

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C903–08
4.4 Suitable eye and hand protection must be worn capable of protection against high velocity re
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