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ASTM C456-18(2023)

(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
2.1 This test method compares relative resistance to hydration of basic refractory brick and shapes in laboratory tests.  
2.2 This test method allows an estimate to be made of the relative potential for hydration.  
2.3 The test method is used in industry and in some cases it is used for specification purposes.  
2.4 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 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.

General Information

Status
Published
Publication Date
31-Oct-2023
ICS
81.080 - Refractories
Technical Committee
C08 - Refractories
Drafting Committee
C08.04 - Chemical Behaviors
Current Stage
Ref Project

Relations

Replaces
ASTM C456-18 - Standard Test Method for Hydration Resistance of Basic Bricks and Shapes
Effective Date
01-Nov-2023
Referred By
ASTM C544-18(2023) - Standard Test Method for Hydration of Dead-Burned Magnesite or Periclase Grain
Effective Date
01-Nov-2023
Referred By
ASTM C71-12(2018) - Standard Terminology Relating to Refractories
Effective Date
01-Nov-2023

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ASTM C456-18(2023) - Standard Test Method for Hydration Resistance of Basic Bricks and ShapesASTM C456-18(2023) - Standard Test Method for Hydration Resistance of Basic Bricks and Shapes
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ASTM C456-18(2023) - Standard Test Method for Hydration Resistance of Basic Bricks and Shapes
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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.
Designation: C456 − 18 (Reapproved 2023)
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 4. Test Specimens
1.1 This test method covers measurement of the relative 4.1 The test specimens shall be 1-in. (25 mm) cubes cut
resistance of basic brick and shapes to hydration. from the interior of basic refractory brick or shapes so that no
original surfaces are present. Only one specimen shall be cut
1.2 The values stated in inch-pound units are to be regarded
from each of five bricks or shapes.
as the standard. The values given in parentheses are for
information only.
5. Procedure
1.3 This standard does not purport to address all of the
5.1 Dry the test specimens to constant weight at 220 °F to
safety concerns, if any, associated with its use. It is the
230 °F (105 °C to 110 °C) in a forced-air drier.
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
5.2 Add sufficient water to the autoclave to maintain 80 psi
mine the applicability of regulatory limitations prior to use.
(552 kPa) at 324 °F (162 °C) for the duration of each 5-h test,
1.4 This international standard was developed in accor-
but not enough to permit contact with any of the specimens.
dance with internationally recognized principles on standard-
5.3 Place each specimen in a lidless No. 2 porcelain
ization established in the Decision on Principles for the
crucible, and place the crucible in the autoclave on a suitable
Development of International Standards, Guides and Recom-
rack to protect the specimen from drip or condensate. Fig. 1 is
mendations issued by the World Trade Organization Technical
an example of a rack designed for cylindrical autoclave.
Barriers to Trade (TBT) Committee.
5.4 Heat the autoclave with the pressure release valve open.
2. Significance and 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,
2.1 This test method compares relative resistance to hydra-
and bring the autoclave to 80 psi (552 kPa) and at 324 °F
tion of basic refractory brick and shapes in laboratory tests.
(162 °C) in a total time of 1 h. Maintain the autoclave at 80 psi
2.2 This test method allows an estimate to be made of the
6 5 psi (552 kPa 6 50 kPa) at 324 °F 6 4 °F (162 °C 6 2 °C)
relative potential for hydration.
for 5 h.
2.3 The test method is used in industry and in some cases it
5.5 Allow sufficient cooling to lower the autoclave to 20 psi
is used for specification purposes.
to 30 psi (138 kPa to 207 kPa) with the release valve closed,
2.4 The results must be carefully used as a means of
and then carefully open the relief valve to reduce the autoclave
predicting whether or not basic brick or shapes will hydrate
to atmospheric pressure in a total time between 30 min and
under actual conditions of storage or service.
60 min. Remove the specimens and examine them.
...

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1.1 This test method covers the determination of the true specific gravity of solid materials, and is particularly useful for materials that easily hydrate which are not suitable for test with Test Method C135. This test method may be used as an alternate for Test Methods C135, C128, and C188 for determining true specific gravity.  
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1.2.1 Exception—In 7.3, the equivalent SI unit is expressed in parentheses.  
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