ASTM C862-01

Standard Practice for Preparing Refractory Concrete Specimens by Casting

SCOPE
1.1 This practice covers the mixing, casting and curing of monolithic refractory concrete specimens for use in further testing. It does not apply to monolithic castable refractories intended primarily for gunning applications.
1.2 The values given in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
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: 09-Feb-2001
• ICS: 81.080 - Refractories
• Technical Committee: C08 - Refractories
• Drafting Committee: C08.09 - Monolithics

Relations

• Replaces: ASTM C862-91(1997) - Standard Practice for Preparing Refractory Concrete Specimens by Casting
• Effective Date: 10-Feb-2001
• Replaced By: ASTM C862-02 - Standard Practice for Preparing Refractory Concrete Specimens by Casting
• Effective Date: 10-Nov-2002
• Referred By: ASTM C865-22 - Standard Practice for Firing Refractory Concrete Specimens
• Effective Date: 10-Feb-2001
• Referred By: ASTM C704/C704M-15(2022)e1 - Standard Test Method for Abrasion Resistance of Refractory Materials at Room Temperature
• Effective Date: 10-Feb-2001
• Referred By: ASTM C401-12(2022) - Standard Classification of Alumina and Alumina-Silicate Castable Refractories
• Effective Date: 10-Feb-2001
• Referred By: ASTM C1656-13(2023) - Standard Guide for Measuring the Reactivity of Hydraulic Refractory Castables Using Exothermic Profile
• Effective Date: 10-Feb-2001
• Referred By: ASTM C1446-19 - Standard Test Method for Measuring Consistency of Self-Flowing Castable Refractories
• Effective Date: 10-Feb-2001
• Referred By: ASTM C133-97(2021) - Standard Test Methods for Cold Crushing Strength and Modulus of Rupture of Refractories
• Effective Date: 10-Feb-2001
• Referred By: ASTM C16-03(2018) - Standard Test Method for Load Testing Refractory Shapes at High Temperatures
• Effective Date: 10-Feb-2001
• Referred By: ASTM C417-21 - Standard Test Method for Thermal Conductivity of Unfired Monolithic Refractories
• Effective Date: 10-Feb-2001

Standards Content (Sample)

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: C 862 – 01
Standard Practice for
1
Preparing Refractory Concrete Specimens by Casting
This standard is issued under the fixed designation C 862; 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 to 60 % relative humidity for preconditioning materials and
equipment, batching and mixing casting test specimens, strip-
1.1 This practice covers the mixing, casting and curing of
ping molds, and testing specimens. Report laboratory tempera-
monolithic refractory concrete specimens for use in further
ture and relative humidity with physical test results if other
testing. It does not apply to monolithic castable refractories
than specified.
intended primarily for gunning applications.
4.2 Balances—Appropriately sized scales having a sensitiv-
1.2 The values given in inch-pound units are to be regarded
ity of 0.2 % of the related batch size.
as the standard. The values given in parentheses are for
4.3 Castable Mixers—An electrically operated mechanical
information only.
4
mixer (Fig. 1) may be used for preparing castable batches for
1.3 Various specimen sizes are required for specific test
3 3 3
1
casting specimens. A 2-ft (56.6-dm ) mixing bowl or a 2 ⁄2-ft
methods. Refer to these test methods to determine the size and
3
(70.8-dm ) concrete mixer has sufficient capacity to mix about
number of specimens, which will be required from the sample.
3
1ft of refractory castable. The smallest batches required for
1.4 This standard does not purport to address all of the
3
casting 1-in. (25-mm) square bars can be mixed in a 0.10-ft
safety concerns, if any, associated with its use. It is the
3
(2.83-dm ) bowl available with bench mixers. Size mixing
responsibility of the user of this standard to establish appro-
bowl to contain from 50 to 75 % volume loading with the dry
priate safety and health practices and determine the applica-
batch.
bility of regulatory limitations prior to use.
NOTE 1—Castable water requirement variation becomes more signifi-
2. Referenced Documents
cant as dry volume loadings drop below 40 % because the water required
to wet the bowl surfaces changes more rapidly with decreasing volume
2.1 ASTM Standards:
loadings.
C 133 Test Methods for Cold Crushing Strength and Modu-
2
lus of Rupture of Refractories
4.4 Gang Molds—Metal, two or more sets, as shown in
C 192 Practice for Making and Curing Concrete Test Speci-
Figs. 2 and 3, for casting specimens to the size required for
3
mens in the Laboratory
specific physical property testing (see Note 8). The front plate
of the mold illustrated is held in place by quick-release clamps
3. Significance and Use
(50-lbf (222-N) pull exerted by each clamp) that permit
3.1 This practice is used to standardize mixing, mold
emptying the mold by releasing the clamps and tapping the left
conditions, placement and curing of refractory concrete speci-
end of the front plate, thereby parting all of the separator plates
5
mens to be used for testing and evaluation under other test
and loosening the cast-test specimens.
methods.
4.4.1 As an alternative design for 1 in. (25-mm) square bars,
3.2 This practice standardizes laboratory conditions for
individual molds may be constructed out of 16-gage (1.588-
producing refractory concrete specimens to minimize
mm) stainless-steel sheet and ganged in groups of five with a
laboratory-to-laboratory variation and does not attempt to
large rubber band on a glass base-plate.
duplicate the conditions of field installations.
4.4.2 There are commercially available molds from con-
3.3 This practice can be used for the preparation of speci-
crete testing suppliers and other sources. Molds may be
mens used in referee testing.
reusable or for single use. Molds must be water tight, rigid, and
removable.
4. Apparatus and Conditions
4.5 Calipers—Suitable for measuring internal longitudinal
4.1 Laboratory Conditions—The laboratory ambient should
mold dimensions and subsequent specimen length size to the
be controlled between 70 and 80°F (20 and 27°C) and from 40
nearest 0.01 in. (0.25 mm).
4.6 Mold Lubricant—Either paraffin or silicone-based oils
1
This practice is under the jurisdiction of ASTM Committee C08 on Refracto-
ries, and is the direct responsibility of Subcommittee C08.09 on Monolithic
4
Refractories. Mixers having various capacities are available from the Hobart Manufacturing
Current edition approved Feb. 10, 2001. Published May 2001. Originally Co., Troy, OH and have been found to be suitable for this purpose.
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published as C 862 – 77. Last previous edition C 862 – 91(1997). A list of materials and notes on co
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