ASTM C492-92(2003)
(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.
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Designation:C 492–92 (Reapproved 2003)
Standard Test Method for
Hydration of Granular Dead-Burned Refractory Dolomite
This standard is issued under the fixed designation C 492; 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 4. Apparatus
1.1 This test method covers the determination of the amount 4.1 Sieve,ASTM No. 40 (425-µm) (equivalent to a 35-mesh
of hydration of a granular dead-burned refractory dolomite Tyler Standard Series) conforming to Specification E 11, with
when exposed to moist air. pan and cover.
1.2 The values stated in inch-pound units are to regarded as 4.2 Glass Petri Dishes, 95 by 20-mm.
the standard. The values given in parentheses are for informa- 4.3 CirculatingHot-AirOven,capableofoperatingat220to
tion only. 230°F (104 to 110°C).
1.3 This standard does not purport to address all of the 4.4 Steam-HumidityCabinet, to be maintained at 160 6 2°F
safety concerns, if any, associated with its use. It is the (71 6 1°C) and 85 6 3 % humidity.
responsibility of the user of this standard to establish appro- 4.5 Scale, having a capacity of 200 g, accurate to 0.02 g.
priate safety and health practices and determine the applica-
5. Sampling
bility of regulatory limitations prior to use.
5.1 The sample used shall be quartered or riffled so that it is
2. Referenced Documents
typical of the material being tested both in screen size and
2.1 ASTM Standards: oiling.All material passing the No. 40 (425-µm) sieve shall be
C 92 Test Methods for SieveAnalysis andWater Content of removed from this sample by screening.All screening shall be
Refractory Materials done in accordance with Test Methods C 92 for dry sieve
E 11 Specification for Wire-Cloth Sieves for Testing Pur- analysis.
poses
6. Procedure
3. Significance and Use
6.1 Placea100 60.1-gportionoftherepresentativesample
3.1 The hydration of dead-burned dolomite grains is an retained on the No. 40 (425-µm) sieve sample in a 95 by
important aspect of both manufacturing and using such grains. 20-mm Petri dish. Then place this dish in a hot-air oven for
Moisture from any source will cause the grains to partially 1 2 h at 220 to 230°F (104 to 110°C) to prevent condensation
/
disintegrate, eventually making the dead-burned dolomite unfit of water on the sample when placed in a hot steam-humidity
for use. This test method may prove useful for determining, in cabinet.
a relative manner, which grains are more resistant to hydration 6.2 Transfer the Petri dish containing the sample from the
than others. hot-air oven to the steam-humidity cabinet, and cover with a
3.2 Data from one laboratory might help in establishing glassplateatanangleof45°topreventdrippingonthesample.
internal limits for determining whether a particular batch of The edges of the glass plate shall overhang the Petri dish by
grain is suitable for refractory production. However, this test about ⁄4 in. (19 mm).
method takes great care to run, and is not recommended as a 6.3 Maintain the steam-humidity cabinet at 160 6 2°F (71
quality control test. Possibly, a specification might be devel- 6 1°C) and 85 6 3 % humidity for 24 h. The time to reach
oped between two parties if sufficient care in establishing the these conditions shall be approximately ⁄2 h. Then immedi-
bias between the laboratories is carried out. ately remove the Petri dish from the cabinet and place in a
hot-air oven at 220 to 230°F (104 to 110°C) for ⁄2 h or until a
constantweightisattained.ThenscreenthesampleonaNo.40
This test method is under the jurisdiction of ASTM Committee C-8 on
(425-µm) sieve and weigh the material passing the sieve to the
Refractories and is the direct responsibility of Subcommittee C08.04 on Chemical
nearest 0.1 g. Always run the tests in triplicate.
Behaviors.
Current edition approved Nov. 1, 2003. Published Dec. 2003. Originally
published as C492 – 62T. Last previous edition approved in 1998 as C492 – 92
(1998).
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