ASTM C563-02

Standard Test Method for Optimum SO₃ in Hydraulic Cement Using 24-h Compressive Strength

SCOPE
1.1 This test method describes the determination of optimum SO3 for maximum 24-h compressive strength by measuring the change in strength produced in hydraulic cement mortar as a result of substituting calcium sulfate for a portion of the cement. Usually, but not always, the SO3 content that produces the highest 24-h strength at 23°C also produces approximately the lowest expansion in water and the lowest contraction in air at that temperature.
1.2 This test method refers to the sulfur trioxide (SO3) content of the cement only. Slag cements and occasionally other hydraulic cements can contain sulfide or other forms of sulfur. The determination of SO3 content by rapid methods may include these other forms, and may therefore produce a significant error. If a significant error occurs, analyze the cement for SO3 content using the reference test method of Test Methods C 114 for sulfur trioxide.
1.3 Values stated as SI units are to be regarded as standard.
1.4 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.

General Information

• Status: Historical
• Publication Date: 09-Jun-2002
• ICS: 91.100.10 - Cement. Gypsum. Lime. Mortar
• Technical Committee: C01 - Cement
• Drafting Committee: C01.28 - Sulfate Content

Relations

• Replaced By: ASTM C563-03 - Standard Test Method for Optimum SO₃ in Hydraulic Cement Using 24-h Compressive Strength
• Effective Date: 10-Jan-2003
• Referred By: ASTM C595/C595M-23 - Standard Specification for Blended Hydraulic Cements
• Effective Date: 10-Jun-2002
• Referred By: ASTM C150/C150M-22 - Standard Specification for Portland Cement
• Effective Date: 10-Jun-2002

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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.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.
Designation: C 563 – 02
Standard Test Method for
Optimum SO in Hydraulic Cement Using 24-h Compressive
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1
Strength
This standard is issued under the fixed designation C 563; 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 C 511 Specification for Moist Cabinets, Moist Rooms and
Water Storage Tanks Used in the Testing of Hydraulic
1.1 This test method describes the determination of opti-
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Cements and Concretes
mum SO for maximum 24-h compressive strength by mea-
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2
C 595 Specification for Blended Hydraulic Cements
suring the change in strength produced in hydraulic cement
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C 778 Specification for Standard Sand
mortar as a result of substituting calcium sulfate for a portion
C 1157 Performance Specification for Blended Hydraulic
of the cement. Usually, but not always, the SO content that
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2
Cement
produces the highest 24-h strength at 23°C also produces
approximately the lowest expansion in water and the lowest
3. Significance and Use
contraction in air at that temperature.
3.1 The purpose of this test method is to estimate the SO
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1.2 This test method refers to the sulfur trioxide (SO )
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content for a hydraulic cement that gives maximum 24-h
content of the cement only. Slag cements and occasionally
compressive strength.
other hydraulic cements can contain sulfide or other forms of
3.2 The optimum SO content for 24-h compressive
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sulfur. The determination of SO content by rapid methods may
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strength is not necessarily the optimum SO content for later
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include these other forms, and may therefore produce a
ages or for volume change. Confirming tests can be made if the
significant error. If a significant error occurs, analyze the
relationships between SO and these properties are not known
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cement for SO content using the reference test method of Test
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for the cement being tested.
Methods C 114 for sulfur trioxide.
3.3 This test method indicates optimum SO content for
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1.3 Values stated as SI units are to be regarded as standard.
cement in mortar made and cured at a standard temperature of
1.4 This standard does not purport to address all of the
23.0 6 2.0°C (73.5 6 3.5°F). The optimum SO increases with
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safety concerns, if any, associated with its use. It is the
increasing temperature and may increase when water-reducing
responsibility of the user of this standard to establish appro-
admixtures are used.
priate safety and health practices and determine the applica-
3.4 It should not be assumed that the optimum SO
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bility of regulatory limitations prior to use.
estimated in this test method is the same SO content for
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2. Referenced Documents optimum performance of a concrete prepared from the cement.
3.5 The test method is applicable to cements specified in
2.1 ASTM Standards:
Specifications C 150, C 595, and C 1157.
C 109/C 109M Test Method for Compressive Strength of
Hydraulic Cement Mortars (Using 2-in. or [50-mm] Cube
4. Apparatus
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Specimens)
4.1 Use the apparatus as specified in Test Method C 109/
C 114 Test Methods for Chemical Analysis of Hydraulic
2 C 109M.
Cement
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C 150 Specification for Portland Cement
5. Materials
C 204 Test Method for Fineness of Hydraulic Cement by
2 5.1 Calcium Sulfate—Use calcium sulfate for addition to
Air Permeability Apparatus
the cement that is either a high-grade natural gypsum having an
C 305 Practice for Mechanical Mixing of Hydraulic Cement
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2 SO content of at least 46 %, or the calcium sulfate from the
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Pastes and Mortars of Plastic Consistency
source used for the intended plant production. Grind the
C 471 Test Methods for Chemical Analysis of Gypsum and
2 calcium sulfate to 100 % passing the 75-μm (No. 200) sieve,
Gypsum Products
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and at least 800 m /kg Blaine fineness (Test Method C 204). If
the SO content of the calcium sulfate is unknown, analyze it
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This test method is under the jurisdiction of ASTM Committee C01 on Cement
and is the direct responsibility of Subcommittee C01.28 on Sulfate Content.
Current edition approved June 10, 2002. Published August 2002. Originally
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published as C 563 – 65. Last previous edition C 563 – 96. Terra Alba, available from the U.S. Gypsum Co., Southard, OK plant, meets
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Annual Book of ASTM Standards, Vol 04.01. these requirements for fineness and SO content.
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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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