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ASTM C492-92(2008)

(Test Method)

Standard Test Method for Hydration of Granular Dead-Burned Refractory Dolomite

Standard Test Method for Hydration of Granular Dead-Burned Refractory Dolomite

SIGNIFICANCE AND USE
The hydration of dead-burned dolomite grains is an important aspect of both manufacturing and using such grains. Moisture from any source will cause the grains to partially disintegrate, eventually making the dead-burned dolomite unfit for use. This test method may prove useful for determining, in a relative manner, which grains are more resistant to hydration than others.  
Data from one laboratory might help in establishing internal limits for determining whether a particular batch of grain is suitable for refractory production. However, this test method takes great care to run, and is not recommended as a quality control test. Possibly, a specification might be developed between two parties if sufficient care in establishing the bias between the laboratories is carried out.
SCOPE
1.1 This test method covers the determination of the amount of hydration of a granular dead-burned refractory dolomite when exposed to moist air.
1.2 The values stated in inch-pound units are to regarded as the standard. The values given in parentheses are 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
C08.04 - Chemical Behaviors
Current Stage
Ref Project

Relations

Replaces
ASTM C492-92(2003) - Standard Test Method for Hydration of Granular Dead-Burned Refractory Dolomite
Effective Date
01-Mar-2008
Replaced By
ASTM C492-92(2013) - Standard Test Method for Hydration of Granular Dead-Burned Refractory Dolomite
Effective Date
01-Apr-2013
Referred By
ASTM C71-12(2018) - Standard Terminology Relating to Refractories
Effective Date
01-Mar-2008

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ASTM C492-92(2008) - Standard Test Method for Hydration of Granular Dead-Burned Refractory DolomiteASTM C492-92(2008) - Standard Test Method for Hydration of Granular Dead-Burned Refractory Dolomite
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ASTM C492-92(2008) - Standard Test Method for Hydration of Granular Dead-Burned Refractory Dolomite
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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: C492 − 92(Reapproved 2008)
Standard Test Method for
Hydration of Granular Dead-Burned Refractory Dolomite
This standard is issued under the fixed designation C492; 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 oped between two parties if sufficient care in establishing the
bias between the laboratories is carried out.
1.1 This test method covers the determination of the amount
of hydration of a granular dead-burned refractory dolomite
4. Apparatus
when exposed to moist air.
4.1 Sieve, ASTM No. 40 (425-µm) (equivalent to a 35-mesh
1.2 The values stated in inch-pound units are to regarded as
Tyler Standard Series) conforming to Specification E11, with
the standard. The values given in parentheses are for informa-
pan and cover.
tion only.
4.2 Glass Petri Dishes, 95 by 20-mm.
1.3 This standard does not purport to address all of the
4.3 CirculatingHot-AirOven,capableofoperatingat220to
safety concerns, if any, associated with its use. It is the
230°F (104 to 110°C).
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
4.4 Steam-HumidityCabinet, to be maintained at 160 6 2°F
bility of regulatory limitations prior to use.
(71 6 1°C) and 85 6 3 % humidity.
4.5 Scale, having a capacity of 200 g, accurate to 0.02 g.
2. Referenced Documents
2.1 ASTM Standards:
5. Sampling
C92 Test Methods for Sieve Analysis and Water Content of
5.1 The sample used shall be quartered or riffled so that it is
Refractory Materials
typical of the material being tested both in screen size and
E11 Specification for Woven Wire Test Sieve Cloth and Test
oiling.All material passing the No. 40 (425-µm) sieve shall be
Sieves
removed from this sample by screening.All screening shall be
done in accordance with Test Methods C92 for dry sieve
3. Significance and Use
analysis.
3.1 The hydration of dead-burned dolomite grains is an
important aspect of both manufacturing and using such grains. 6. Procedure
Moisture from any source will cause the grains to partially
6.1 Place a 100 6 0.1-g portion of the representative sample
disintegrate, eventually making the dead-burned dolomite unfit
retained on the No. 40 (425-µm) sieve sample in a 95 by
for use. This test method may prove useful for determining, in
20-mm Petri dish. Then place this dish in a hot-air oven for ⁄2
a relative manner, which grains are more resistant to hydration
h at 220 to 230°F (104 to 110°C) to prevent condensation of
than others.
water on the sample when placed in a hot steam-humidity
3.2 Data from one laboratory might help in establishing cabinet.
internal limits for determining whether a particular batch of
6.2 Transfer the Petri dish containing the sample from the
grain is suitable for refractory production. However, this test
hot-air oven to the steam-humidity cabinet, and cover with a
method takes great care to run, and is not recommended as a
glassplateatanangleof45°topreventdrippingonthesample.
quality control test. Possibly, a specification might be devel-
The edges of the glass plate shall overhang the Petri dish by
about ⁄4 in. (19 mm).
This test method is under the jurisdiction of ASTM Committee C08 on
6.3 Maintain the steam-humidity cabinet at 160 6 2°F (71
Refractories and is the direct responsibility of Subcommittee C08.04 on Chemical
6 1°C) and 85 6 3 % humidity for 24 h. The time to reach
Behaviors.
these conditions shall be approximately ⁄2 h. Then immedi-
Current edition approved March 1, 2008. Published March 2008. Originally
ately remove the Petri dish from the cabinet and place in a
approved in 1962. Last previous edition approved in 2003 as C492 – 92 (2003).
DOI: 10.1520/C0492-92R08.
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 An apparatus manufactured by the American Instrument Co., 8030 Georgia
Standards volume information, refer to the standard’s Doc
...

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3.1 The hydration of dead-burned dolomite grains is an important aspect of both manufacturing and using such grains. Moisture from any source will cause the grains to partially disintegrate, eventually making the dead-burned dolomite unfit for use. This test method may prove useful for determining, in a relative manner, which grains are more resistant to hydration than others.  
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