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ASTM C903-98(2004)

(Practice)

Standard Practice for Preparing Refractory Castable Specimens by Cold Gunning

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.
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
31-Aug-2004
ICS
81.080 - Refractories
Technical Committee
C08 - Refractories
Drafting Committee
C08.09 - Monolithics
Current Stage
Ref Project

Relations

Replaces
ASTM C903-98 - Standard Practice for Preparing Refractory Castable Specimens by Cold Gunning
Effective Date
01-Sep-2004
Replaced By
ASTM C903-08 - Standard Practice for Preparing Refractory Castable Specimens by Cold Gunning
Effective Date
01-Mar-2008

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ASTM C903-98(2004) - Standard Practice for Preparing Refractory Castable Specimens by Cold GunningASTM C903-98(2004) - Standard Practice for Preparing Refractory Castable Specimens by Cold Gunning
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ASTM C903-98(2004) - Standard Practice for Preparing Refractory Castable Specimens by Cold Gunning
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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:C 903–98 (Reapproved 2004)
Standard Practice for
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 same equipment to produce specimens for referee testing
agreedtobytheinvolvedtestingparties.Thespecificoperating
1.1 Thispracticecoversaprocedureforpreparingrefractory
parameters should be shown in the report.
castable specimens usually containing calcium aluminate ce-
3.5 Although this practice is specifically designed for re-
ment with or without metal fibers by cold nozzle-mix gunning.
fractory castables containing calcium aluminate cement, it may
Specimens prepared in accordance with this practice are
be used with minor modifications for gun mixes containing
intended for use in standard ASTM test methods required for
other bond systems.
evaluating gunned materials.
1.2 The values stated in inch-pound units are to be regarded
4. Apparatus
as the standard. The values given in parentheses are provided
4.1 Gun, pneumatic nozzle-mix. At least 50 ft (15.2 m) of
for information only.
hose should be available. Acceptable nozzle diameters range
1.3 This standard does not purport to address all of the
from 1 to 2 in. (25 to 51 mm).
safety concerns, if any, associated with its use. It is the
4.2 Air Compressor, capable of delivering sufficient pres-
responsibility of the user of this standard to establish appro-
sure and volume to adequately move castable to the gun. The
priate safety and health practices and determine the applica-
3 3
compressor should be able to supply at least 250 ft (7 m )/min.
bility of regulatory limitations prior to use.
4.3 Forms, suitable nonabsorbent type, which will vary in
2. Referenced Documents size in accordance with the number of samples being prepared,
but are typically 36 by 36 by 5 ⁄2 in. (915 by 915 by 140 mm).
2.1 ASTM Standards:
Forms should be sized to prevent rebound entrapment. The use
C 401 Classification of Alumina and Alumina-Silicate
of ⁄2 inch hardware cloth as sidewalls of the form allows most
Castable Refractories
of the rebound to pass through. This reduces the size of the
C 865 Practice for Firing Refractory Concrete Specimens
form required to achieve the desired standard sized central
3. Significance and Use portion of 24 by 24 in. (610 by 610 mm).
4.4 Suitable eye and hand protection must be worn capable
3.1 The properties of refractory castables can be affected by
of protection against high velocity refractory particles and steel
their method of installation.This practice attempts to minimize
fibers.
the variables encountered during installation by pneumatic
gunning.
5. Procedure
3.2 This practice provides parameters to produce gunned
5.1 Store the castable to be gunned at 70 to 85°F (20 to
specimens for use in other ASTM test methods.
27°C) for 24 h prior to gunning.
3.3 This practice may be used to produce specimens for
5.2 Oil the forms lightly. Typically 10W-30 oil is used.
acceptance testing, service evaluation, manufacturing control,
Place the form against a rigid surface at an angle of 80 to 90°
and research and development.
to the horizontal.
3.4 Differences between various kinds of equipment and the
5.3 Ifrecommendedbythesupplier,predampenthecastable
differences in procedures and operator techniques may result in
by mixing with potable water in a paddle mixer for 1 to 5 min
significant variations in the physical properties of the gunned
or follow manufacturer’s specific instructions. In general,
specimens. It is recommended that the same operator use the
regular (dense) castables require 2 to 4 % of predampening
water and lightweight (insulating) castables require 5 to 8 %.
NOTE 1—Castables that contain a high-purity cement may benefit by
ThispracticeisunderthejurisdictionofASTMCommitteeC08onRefractories
and is the direct responsibility of Subcommittee C08.09 on Monolithic Refractories. aging for 5 to 10 min after dampening before gunning. This “aging’’
Current edition approved Sept. 1, 2004. Published October 2004. Originally
procedure should be used if gunning without it produces excessive
approved in 1979. Last previous edition approved in 1998 as C 903 – 98.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on Equipment available from Allentown Pneumatic Gun Co., P.O. Box 185,
the ASTM website. Allentown, PA 18105, has been found suitable for this purpose (Model N-1 or N-0).
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
-------------
...

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