ASTM C492-92(2017)
(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
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.
3.2 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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Designation: C492 − 92 (Reapproved 2017)
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 3.2 Data from one laboratory might help in establishing
internal limits for determining whether a particular batch of
1.1 This test method covers the determination of the amount
grain is suitable for refractory production. However, this test
of hydration of a granular dead-burned refractory dolomite
method takes great care to run, and is not recommended as a
when exposed to moist air.
quality control test. Possibly, a specification might be devel-
1.2 The values stated in inch-pound units are to regarded as
oped between two parties if sufficient care in establishing the
the standard. The values given in parentheses are for informa-
bias between the laboratories is carried out.
tion only.
1.3 This standard does not purport to address all of the 4. Apparatus
safety concerns, if any, associated with its use. It is the
4.1 Sieve, ASTM No. 40 (425-µm) (equivalent to a 35-mesh
responsibility of the user of this standard to establish appro-
Tyler Standard Series) conforming to Specification E11, with
priate safety, health, and environmental practices and deter-
pan and cover.
mine the applicability of regulatory limitations prior to use.
4.2 Glass Petri Dishes, 95 by 20-mm.
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard-
4.3 CirculatingHot-AirOven,capableofoperatingat220to
ization established in the Decision on Principles for the 230 °F (104 to 110 °C).
Development of International Standards, Guides and Recom-
4.4 Steam-Humidity Cabinet, to be maintained at 160 6
mendations issued by the World Trade Organization Technical 3
2 °F (71 6 1 °C) and 85 6 3 % humidity.
Barriers to Trade (TBT) Committee.
4.5 Scale, having a capacity of 200 g, accurate to 0.02 g.
2. Referenced Documents
5. Sampling
2.1 ASTM Standards:
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
6. Procedure
important aspect of both manufacturing and using such grains.
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
a relative manner, which grains are more resistant to hydration 1
⁄2 h at 220 to 230 °F (104 to 110 °C) to prevent condensation
than others.
of water on the sample when placed in a hot steam-humidity
cabinet.
This test method is under the jurisdiction of ASTM Committee C08 on
6.2 Transfer the Petri dish containing the sample from the
Refractories and is the direct responsibility of Subcommittee C08.04 on Chemical
hot-air oven to the steam-humidity cabinet, and cover with a
Behaviors.
Current edition approved Nov. 1, 2017. Published November 2017. Originally glassplateatanangleof45°topreventdrippingonthesample.
approved in 1962. Last previous edition approved in 2013 as C492 – 92 (2013).
DOI: 10.1520/C0492-92R17.
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 Document Summary page on Ave., Silver Spring, MD, or the Electric Hotpack Co., Philadelphia, PA, has been
the ASTM website. found suitable for this purpose.
Copyright © ASTM International, 1
...
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: C492 − 92 (Reapproved 2013) C492 − 92 (Reapproved 2017)
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
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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
C92 Test Methods for Sieve Analysis and Water Content of Refractory Materials
E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves
3. Significance and Use
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.
3.2 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.
4. Apparatus
4.1 Sieve, ASTM No. 40 (425-μm) (equivalent to a 35-mesh Tyler Standard Series) conforming to Specification E11, with pan
and cover.
4.2 Glass Petri Dishes, 95 by 20-mm.
4.3 Circulating Hot-Air Oven, capable of operating at 220 to 230°F230 °F (104 to 110°C).110 °C).
4.4 Steam-Humidity Cabinet, to be maintained at 160 6 2°F2 °F (71 6 1°C)1 °C) and 85 6 3 % humidity.
4.5 Scale, having a capacity of 200 g, accurate to 0.02 g.
This test method is under the jurisdiction of ASTM Committee C08 on Refractories and is the direct responsibility of Subcommittee C08.04 on Chemical Behaviors.
Current edition approved April 1, 2013Nov. 1, 2017. Published August 2013November 2017. Originally approved in 1962. Last previous edition approved in 20082013
as C492 – 92 (2013). DOI: 10.1520/C0492-92R13.10.1520/C0492-92R17.
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 the ASTM website.
An apparatus manufactured by the American Instrument Co., 8030 Georgia Ave., Silver Spring, MD, or the Electric Hotpack Co., Philadelphia, PA, has been found
suitable for this purpose.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C492 − 92 (2017)
5. Sampling
5.1 The sample used shall be quartered or riffled so that it is typical of the material being tested both in screen size and oiling.
All material passing the No. 40 (425-μm) sieve shall be removed from this sample by screening. All screening shall be done in
accordance with Test Methods C92 for dry sieve analysis.
6. Procedure
6.1 Place a 100 6 0.1-g portion of the representative sample retained on the No. 40 (425-μm) sieve sample in a 95 by 20-mm
Petri dish. Then place this dish in a hot-air oven for ⁄2 h h at 220 to
...
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