ASTM C544-03

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Designation:C 544–03
Standard Test Method for
1
Hydration of Dead Burned 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.
1. Scope 4.2 Standard Sieves, ASTM No. 6 (3.35 mm), No. 12 (1.70
mm), No. 20 (850 µm), No. 40 (425 µm), and No. 50 (300 µm).
1.1 This test method covers the measurement of the relative
resistance of magnesia grain to hydration.
NOTE 2—The equivalent Tyler Standard Series sieves described in Test
1.2 This standard does not purport to address all of the
Methods C 92 may be substituted for the ASTM sieves.
safety concerns, if any, associated with its use. It is the
5. Procedure
responsibility of the user of this standard to establish appro-
5.1 Remove the material retained on a No. 6 (3.35-mm)
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. sieve, and crush it to pass the No. 6 sieve to obtain the
maximum amount of coarse material. Recombine with the
2. Referenced Documents
portionpassingtheNo.6sieve,andscreentheresultantsample
2
2.1 ASTM Standards: to remove all material passing a No. 40 (425-µm) sieve. If
C 92 Test Methods for SieveAnalysis andWater Content of necessary, dry at 220 to 230°F (105 to 110°C).
Refractory Materials 5.2 Separate this sample into the following three fractions:
C 357 TestMethodforBulkDensityofGranularRefractory
Materials
Passing Sieve No. Retained on Sieve No.
6 (3.35 mm) 12 (1.70 mm)
C 456 Test Method for Hydration Resistance of Basic
12 (1.70 mm) 20 (850 µm)
Bricks and Shapes
20 (850 µm) 40 (425 µm)
C 493 TestMethodforBulkDensityandPorosityofGranu-
5.3 Prepare a 100-g specimen by using equal parts by
lar Refractory Materials by Mercury Displacement
weight of the three sizes listed in 5.2.
3. Significance and Use 5.4 Add sufficient water to the autoclave to maintain 80 psi
(552 kPa) at 324°F (162°C) for the duration of each 5-h test,
3.1 This test method determines relative hydration resis-
but not enough to permit contact with any of the specimens.
tance of magnesia grain.
5.5 Place each weighed specimen in a No. 3 porcelain
3.2 This test method is used in industry to evaluate grain
crucible, and cover with a loosely crimped piece of aluminum
samples and is used for specification purposes in some cases.
foil to protect the specimen from drip or condensate. Dry the
3.3 Care must be taken in interpreting the data.
covered crucibles in a forced-air dryer at 220 to 230°F (105 to
4. Apparatus
110°C) for at least 2 h.
5.6 Place the preheated rack containing the specimens in the
4.1 Autoclave, suitable for operation at 80 psi (552 kPa) at
autoclave. Heat the autoclave with the pressure-release valve
324°F (162°C) and equipped with pressure- and temperature-
open; after a steady flow of steam is obtained through the
measuring devices and safety equipment.
valve, continue to purge for 3 min to remove all air, close the
NOTE 1—Asuitable apparatus is shown in Fig. 1 ofTest Method C 456.
valve, and bring the autoclave to 80 psi (552 kPa) at 324°F
(162°C) in a total time of 1 h. Maintain the autoclave at 80 6
5 psi (552 6 35 kPa) and 324 6 4°F (162 6 2°C) for 5 h.
1
This test method is under the jurisdiction of ASTM Committee C08 on
5.7 Allow sufficient cooling to lower the autoclave to 20 to
Refractories and is the direct responsibility of Subcommittee C08.04 on Chemical
30 psi (138 to 207 kPa) with the release valve closed, and then
Behaviors.
carefully open the relief valve to reduce the autoclave to
Current edition approved Nov. 1, 2003. Published December 2003. Originally
e1
approved in 1964. Last previous edition approved in 1998 as C 544 – 92 (1998) .
atmospheric pressure in a total time between 30 and 60 min.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Remove the specimens and dry to constant weight at 220 to
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
230°F (105 to 110°C) in a forced-air dryer. Record the
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. individual specimen weight, G.
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C544–03
TABLE 1 Material Properties
5.8 PlaceeachspecimenwiththecoverandthepanonaNo.
50 (300-µm) sieve, and screen according to Test Methods C 92
Material Number 1234
for dry sieve analysis. Weigh the amount of material retained
Chemical Analysis (Calcin
...