ASTM C544-92(1998)e1

Standard Test Method for Hydration of Magnesite or Periclase Grain

SCOPE
1.1 This test method covers the measurement of the relative resistance of magnesite or periclase grain to hydration.  
1.2 This standard does not purport to address all of the safety problems, 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-Mar-1998
• ICS: 91.100.15 - Mineral materials and products
• Technical Committee: C08 - Refractories
• Drafting Committee: C08.04 - Chemical Behaviors

Relations

• Replaced By: ASTM C544-03 - Standard Test Method for Hydration of Dead Burned Magnesite or Periclase Grain
• Effective Date: 01-Nov-2003

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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.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.
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Designation: C 544 – 92 (Reapproved 1998)
Standard Test Method for
Hydration of Magnesite or Periclase Grain
This standard is issued under the fixed designation C 544; 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.
e NOTE—Editorial changes were made throughout in March 1998.
Methods C 92 may be substituted for the ASTM sieves.
1. Scope
1.1 This test method covers the measurement of the relative
5. Procedure
resistance of magnesia grain to hydration.
5.1 Remove the material retained on a No. 6 (3.35-mm)
1.2 This standard does not purport to address all of the
sieve, and crush it to pass the No. 6 sieve to obtain the
safety concerns, if any, associated with its use. It is the
maximum amount of coarse material. Recombine with the
responsibility of the user of this standard to establish appro-
portion passing the No. 6 sieve, and screen the resultant sample
priate safety and health practices and determine the applica-
to remove all material passing a No. 40 (425-μm) sieve. If
bility of regulatory limitations prior to use.
necessary, dry at 220 to 230°F (105 to 110°C).
5.2 Separate this sample into the following three fractions:
2. Referenced Documents
2.1 ASTM Standards:
Passing Sieve No. Retained on Sieve No.
C 92 Test Methods for Sieve Analysis and Water Content of
6 (3.35 mm) 12 (1.70 mm)
Refractory Materials
12 (1.70 mm) 20 (850 μm)
20 (850 μm) 40 (425 μm)
C 357 Test Method for Bulk Density of Granular Refractory
Materials
5.3 Prepare a 100-g specimen by using equal parts by
C 456 Test Method for Hydration Resistance of Basic
weight of the three sizes listed in 5.2.
Bricks and Shapes
5.4 Add sufficient water to the autoclave to maintain 80 psi
C 493 Test Method for Bulk Density and Porosity of Granu-
(552 kPa) at 324°F (162°C) for the duration of each 5-h test,
lar Refractory Materials by Mercury Displacement
but not enough to permit contact with any of the specimens.
5.5 Place each weighed specimen in a No. 3 porcelain
3. Significance and Use
crucible, and cover with a loosely crimped piece of aluminum
3.1 This test method determines relative hydration resis-
foil to protect the specimen from drip or condensate. Dry the
tance of magnesia grain.
covered crucibles in a forced-air dryer at 220 to 230°F (105 to
3.2 This test method is used in industry to evaluate grain
110°C) for at least 2 h.
samples and is used for specification purposes in some cases.
5.6 Place the preheated rack containing the specimens in the
3.3 Care must be taken in interpreting the data.
autoclave. Heat the autoclave with the pressure-release valve
open; after a steady flow of steam is obtained through the
4. Apparatus
valve, continue to purge for 3 min to remove all air, close the
4.1 Autoclave, suitable for operation at 80 psi (552 kPa) at
valve, and bring the autoclave to 80 psi (552 kPa) at 324°F
324°F (162°C) and equipped with pressure- and temperature-
(162°C) in a total time of 1 h. Maintain the autoclave at 80 6
measuring devices and safety equipment.
5 psi (552 6 35 kPa) and 324 6 4°F (162 6 2°C) for 5 h.
NOTE 1—A suitable apparatus is shown in Fig. 1 of Test Method C 456. 5.7 Allow sufficient cooling to lower the autoclave to 20 to
30 psi (138 to 207 kPa) with the release valve closed, and then
4.2 Standard Sieves, ASTM No. 6 (3.35 mm), No. 12 (1.70
carefully open the relief valve to reduce the autoclave to
mm), No. 20 (850 μm), No. 40 (425 μm), and No. 50 (300 μm).
atmospheric pressure in a total time between 30 and 60 min.
NOTE 2—The equivalent Tyler Standard Series sieves described in Test
Remove the specimens and dry to constant weight at 220 to
230°F (105 to 110°C) in a forced-air dryer. Record the
1 individual specimen weight, G.
This test method is under the jurisdiction of ASTM Committee C-8 on
5.8 Place each specimen with the cover and the pan on a No.
Refractories and is the direct responsibility of Subcommittee C08.04 on Chemical
Behaviors.
50 (300-μm) sieve, and screen according to Test Methods C 92
Current edition approved July 15, 1992. Published September 1992. Originally
for dry sieve analysis. Weigh the amount of material retained
published as C 544 – 64. Last previous edition C 544 – 91.
2 on the No. 50 sieve. Record the individual specimen weight, H.
Annual Book of ASTM Standards, Vol 15.01.
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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.
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C 544 – 92 (1998)
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