ASTM C862-16

Standard Practice for Preparing Refractory Concrete Specimens by Casting

SIGNIFICANCE AND USE
3.1 This practice is used to standardize mixing, mold conditions, placement and curing of refractory concrete specimens to be used for testing and evaluation under other test methods.  
3.2 This practice standardizes laboratory conditions for producing refractory concrete specimens to minimize laboratory-to-laboratory variation and does not attempt to duplicate the conditions of field installations.  
3.3 This practice can be used for the preparation of specimens used in referee testing.
SCOPE
1.1 This practice covers the mixing, casting and curing of monolithic refractory concrete specimens under laboratory conditions for use in further testing. It does not apply to monolithic castable refractories intended primarily for gunning applications.  
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 Various specimen sizes are required for specific test methods. Refer to these test methods to determine the size and number of specimens, which will be required from the sample.  
1.4 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-Oct-2016
• ICS: 81.080 - Refractories
• Technical Committee: C08 - Refractories
• Drafting Committee: C08.09 - Monolithics

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: C862 − 16
Standard Practice for
1
Preparing Refractory Concrete Specimens by Casting
This standard is issued under the fixed designation C862; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope laboratory-to-laboratory variation and does not attempt to
duplicate the conditions of field installations.
1.1 This practice covers the mixing, casting and curing of
monolithic refractory concrete specimens under laboratory 3.3 This practice can be used for the preparation of speci-
conditions for use in further testing. It does not apply to mens used in referee testing.
monolithiccastablerefractoriesintendedprimarilyforgunning
4. Apparatus and Conditions
applications.
4.1 Laboratory Conditions—The laboratory ambient should
1.2 The values stated in inch-pound units are to be regarded
becontrolledbetween70and80°F(20and27°C)(Note1)and
as standard. The values given in parentheses are mathematical
from 40 to 60% relative humidity for preconditioning materi-
conversions to SI units that are provided for information only
alsandequipment,batchingandmixingcastingtestspecimens,
and are not considered standard.
stripping molds, and testing specimens. Report laboratory
1.3 Various specimen sizes are required for specific test
temperature and relative humidity with physical test results if
methods. Refer to these test methods to determine the size and
other than specified.
number of specimens, which will be required from the sample.
NOTE 1—A 5 to 6°F temperature difference can drastically change the
1.4 This standard does not purport to address all of the
set time of a mix. It is a good practice to always record ambient
temperature conditions for each cast.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4.2 Balances—Appropriately sized scales having a sensitiv-
priate safety and health practices and determine the applica-
ity of 0.2% of the related batch size.
bility of regulatory limitations prior to use.
4.3 Castable Mixers—An electrically operated mechanical
mixer (Fig. 1) may be used for preparing castable batches for
2. Referenced Documents
3 3 3
1
casting specimens.A2-ft (0.057-m ) mixing bowl or a 2 ⁄2-ft
2
2.1 ASTM Standards:
3
(0.071-m ) concrete mixer has sufficient capacity to mix about
C133Test Methods for Cold Crushing Strength and Modu-
3 3
1ft (0.0285 m ) of refractory castable. The smallest batches
lus of Rupture of Refractories
requiredforcasting1-in.(25-mm)squarebarscanbemixedin
C192/C192MPracticeforMakingandCuringConcreteTest 3 3
a 0.10-ft (0.0028-m ) bowl available with bench mixers. Size
Specimens in the Laboratory
mixing bowl to contain from 50 to 75% volume loading with
the dry batch. Castable water requirement variation becomes
3. Significance and Use
more significant as dry volume loadings drop below 40%
3.1 This practice is used to standardize mixing, mold
because the water required to wet the bowl surfaces changes
conditions, placement and curing of refractory concrete speci-
more rapidly with decreasing volume loadings.
mens to be used for testing and evaluation under other test
4.4 Molds—Typical molds are 9 by 2 by 2 in. and 2 by 2 by
methods.
2 in. made from metal, plastic or rubber and are watertight,
3.2 This practice standardizes laboratory conditions for
rigid, and removable. There are commercially available molds
producing refractory concrete specimens to minimize
from concrete testing suppliers and other sources. Molds may
be reusable or for single use.Although brick-sized shapes may
1
ThispracticeisunderthejurisdictionofASTMCommitteeC08onRefractories
be cut with a diamond saw to obtain a specific size, it is
and is the direct responsibility of Subcommittee C08.09 on Monolithics.
preferable to fabricate the desired shape. The smallest mold
Current edition approved Nov. 1, 2016. Published November 2016. Originally
dimension should be a minimum of three times the largest
approved in 1977. Last previous edition approved in 2008 as C862–02 (2008).
DOI: 10.1520/C0862-16.
aggregate diameter, as specified in Practice C192/C192M.In
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
some cases, when smaller specimens are required and grain
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
sizing does not allow for smaller castings, cut specimens may
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. be used. See Table 1.
Copyright
...

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: C862 − 02 (Reapproved 2008) C862 − 16
Standard Practice for
1
Preparing Refractory Concrete Specimens by Casting
This standard is issued under the fixed designation C862; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope
1.1 This practice covers the mixing, casting and curing of monolithic refractory concrete specimens under laboratory conditions
for use in further testing. It does not apply to monolithic castable refractories intended primarily for gunning applications.
1.2 The values givenstated in inch-pound units are to be regarded as the standard. The values given in parentheses are for
information only.mathematical conversions to SI units that are provided for information only and are not considered standard.
1.3 Various specimen sizes are required for specific test methods. Refer to these test methods to determine the size and number
of specimens, which will be required from the sample.
1.4 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:
C133 Test Methods for Cold Crushing Strength and Modulus of Rupture of Refractories
C192/C192M Practice for Making and Curing Concrete Test Specimens in the Laboratory
3. Significance and Use
3.1 This practice is used to standardize mixing, mold conditions, placement and curing of refractory concrete specimens to be
used for testing and evaluation under other test methods.
3.2 This practice standardizes laboratory conditions for producing refractory concrete specimens to minimize laboratory-to-
laboratory variation and does not attempt to duplicate the conditions of field installations.
3.3 This practice can be used for the preparation of specimens used in referee testing.
4. Apparatus and Conditions
4.1 Laboratory Conditions—The laboratory ambient should be controlled between 70 and 80°F (20 and 27°C) (Note 1) and
from 40 to 60 % relative humidity for preconditioning materials and equipment, batching and mixing casting test specimens,
stripping molds, and testing specimens. Report laboratory temperature and relative humidity with physical test results if other than
specified.
NOTE 1—A 5 to 6°F temperature difference can drastically change the set time of a mix. It is a good practice to always record ambient temperature
conditions for each cast.
4.2 Balances—Appropriately sized scales having a sensitivity of 0.2 % of the related batch size.
4.3 Castable Mixers—An electrically operated mechanical mixer (Fig. 1) may be used for preparing castable batches for casting
3 3 3 3
1
specimens. A 2-ft (56.6-dm(0.057-m ) mixing bowl or a 2 ⁄2-ft (70.8-dm(0.071-m ) concrete mixer has sufficient capacity to mix
3 3
about 1 ft (0.0285 m ) of refractory castable. The smallest batches required for casting 1-in. (25-mm) square bars can be mixed
3 3
in a 0.10-ft (2.83-dm(0.0028-m ) bowl available with bench mixers. Size mixing bowl to contain from 50 to 75 % volume loading
1
This practice is under the jurisdiction of ASTM Committee C08 on Refractories and is the direct responsibility of Subcommittee C08.09 on Monolithics.
Current edition approved March 1, 2008Nov. 1, 2016. Published March 2008November 2016. Originally approved in 1977. Last previous edition approved in 20022008
as C862 – 02.C862 – 02 (2008). DOI: 10.1520/C0862-02R08.10.1520/C0862-16.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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C862 − 16
FIG. 1 Five Quart Hobart Mixer
with the dry batch. Castable water requirement variation becomes more significant as dry volume loadings drop below 40 %
because the water required to wet the bowl surfaces changes more rapidly with decreasing volume loadings.
...