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ASTM C456-93(2008)

(Test Method)

Standard Test Method for Hydration Resistance of Basic Bricks and Shapes

Standard Test Method for Hydration Resistance of Basic Bricks and Shapes

SIGNIFICANCE AND USE
This test method compares relative resistance to hydration of basic refractory brick and shapes in laboratory tests.  
This test method allows an estimate to be made of the relative potential for hydration.  
The test method is used in industry and in some cases it is used for specification purposes.  
The results must be carefully used as a means of predicting whether or not basic brick or shapes will hydrate under actual conditions of storage or service.
SCOPE
1.1 This test method covers measurement of the relative resistance of basic brick and shapes to hydration.  
1.2 The values stated in inch-pound units are to be 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 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
29-Feb-2008
ICS
81.080 - Refractories
Technical Committee
C08 - Refractories
Drafting Committee
C08.04 - Chemical Behaviors
Current Stage
Ref Project

Relations

Replaces
ASTM C456-93(2003) - Standard Test Method for Hydration Resistance of Basic Bricks and Shapes
Effective Date
01-Mar-2008
Replaced By
ASTM C456-13 - Standard Test Method for Hydration Resistance of Basic Bricks and Shapes
Effective Date
01-Sep-2013
Referred By
ASTM C71-12(2018) - Standard Terminology Relating to Refractories
Effective Date
01-Mar-2008
Referred By
ASTM C544-18 - Standard Test Method for Hydration of Dead-Burned Magnesite or Periclase Grain
Effective Date
01-Mar-2008

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ASTM C456-93(2008) - Standard Test Method for Hydration Resistance of Basic Bricks and ShapesASTM C456-93(2008) - Standard Test Method for Hydration Resistance of Basic Bricks and Shapes
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ASTM C456-93(2008) - Standard Test Method for Hydration Resistance of Basic Bricks and Shapes
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: C456 − 93(Reapproved 2008)
Standard Test Method for
Hydration Resistance of Basic Bricks and Shapes
This standard is issued under the fixed designation C456; 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 5. Procedure
1.1 This test method covers measurement of the relative 5.1 Dry the test specimens to constant weight at 220 to
resistance of basic brick and shapes to hydration. 230°F (105 to 110°C) in a forced-air drier.
1.2 The values stated in inch-pound units are to be regarded
5.2 Add sufficient water to the autoclave to maintain 80 psi
as the standard. The values given in parentheses are for (552 kPa) at 324°F (162°C) for the duration of each 5-h test,
information only.
but not enough to permit contact with any of the specimens.
1.3 This standard does not purport to address all of the
5.3 Place each specimen in a lidless No. 2 porcelain
safety problems, if any, associated with its use. It is the
crucible, and place the crucible in the autoclave on a suitable
responsibility of the user of this standard to establish appro-
rack to protect the specimen from drip or condensate (Fig. 2).
priate safety and health practices and determine the applica-
5.4 Heat the autoclave with the pressure release valve open;
bility of regulatory limitations prior to use.
after a steady flow of steam is obtained through the valve,
continue to purge for 3 min to remove all air, close the valve,
2. Significance and Use
and bring the autoclave to 80 psi (552 kPa) and at 324°F
2.1 This test method compares relative resistance to hydra-
(162°C) in a total time of 1 h. Maintain the autoclave at 80 6
tion of basic refractory brick and shapes in laboratory tests.
5 psi (552 6 50 kPa) at 324 6 4°F (162 6 2°C) for 5 h.
2.2 This test method allows an estimate to be made of the
5.5 Allow sufficient cooling to lower the autoclave to 20 to
relative potential for hydration.
30 psi (138 to 207 kPa) with the release valve closed, and then
2.3 The test method is used in industry and in some cases it
carefully open the relief valve to reduce the autoclave to
is used for specification purposes. atmospheric pressure in a total time between 30 and 60 min.
Remove the specimens and examine them.
2.4 The results must be carefully used as a means of
predicting whether or not basic brick or shapes will hydrate 5.6 Repeat the hydration procedure on the same five speci-
under actual conditions of storage or service.
mens for successive 5-h periods up to 30 h, or until the
specimens have a rating of 4 after a given period (6.1).
3. Apparatus
6. Report
3.1 Autoclave, suitable for operation at 80 psi (552 kPa) at
324°F (162°C), and equipped with pressure- and temperature-
6.1 Determine the deterioration of the specimen qualita-
measuring devices, and safety equipment. Fig. 1 is illustrative
tively by visual inspection and rate as follows:
of a suitable, commercially available apparatus.
1 = unaffected,
2 = surface hydration,
4. Test Specimens
3 = cracking or crumbling, and
4.1 The test specime
...

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