ASTM C563-03

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-Jan-2003
• ICS: 91.100.10 - Cement. Gypsum. Lime. Mortar
• Technical Committee: C01 - Cement
• Drafting Committee: C01.28 - Sulfate Content

Relations

• Replaces: ASTM C563-02 - Standard Test Method for Optimum SO₃ in Hydraulic Cement Using 24-h Compressive Strength
• Effective Date: 10-Jan-2003
• Replaced By: ASTM C563-04 - Standard Test Method for Optimum SO₃ in Hydraulic Cement Using 24-h Compressive Strength
• Effective Date: 01-Jun-2004
• Referred By: ASTM C595/C595M-23 - Standard Specification for Blended Hydraulic Cements
• Effective Date: 10-Jan-2003
• Referred By: ASTM C150/C150M-22 - Standard Specification for Portland Cement
• Effective Date: 10-Jan-2003

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: C 563 – 03
Standard Test Method for
Optimum SO in Hydraulic Cement Using 24-h Compressive
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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.
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1. Scope and Gypsum Products [Metric]
C 511 Specification for Moist Cabinets, Moist Rooms, and
1.1 This test method describes the determination of opti-
Water Storage Tanks Used in the Testing of Hydraulic
mum SO for maximum 24-h compressive strength by mea-
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Cements and Concretes
suring the change in strength produced in hydraulic cement
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C 595 Specification for Blended Hydraulic Cements
mortar as a result of substituting calcium sulfate for a portion
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C 778 Specification for Standard Sand
of the cement. Usually, but not always, the SO content that
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2
C 1157 Performance Specification for Hydraulic 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 in mortar made and cured at 23°C. The
other hydraulic cements can contain sulfide or other forms of
value obtained is used to establish the level of sulfate in the
sulfur. The determination of SO content by rapid methods may
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manufacture of cements specified in Specifications C 150,
include these other forms, and may therefore produce a
C 595 and C 1157. In Specifications C 150 and C 595 it is used
significant error. If a significant error occurs, analyze the
to justify exceeding the prescriptive limits for SO .
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cement for SO content using the reference test method of Test
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3.2 The optimum SO content for 24-h compressive
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Methods C 114 for sulfur trioxide.
strength is not necessarily the optimum SO content for later
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1.3 Values stated as SI units are to be regarded as standard.
ages or for volume change. Confirming tests can be made if the
1.4 This standard does not purport to address all of the
relationships between SO and these properties are not known
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safety concerns, if any, associated with its use. It is the
for the cement being tested.
responsibility of the user of this standard to establish appro-
3.3 This test method indicates optimum SO content for
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priate safety and health practices and determine the applica-
cement in mortar made and cured at a standard temperature of
bility of regulatory limitations prior to use.
23.0 6 2.0°C (73.5 6 3.5°F). The optimum SO increases with
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2. Referenced Documents increasing temperature and may increase when water-reducing
admixtures are used.
2.1 ASTM Standards:
3.4 It should not be assumed that the optimum SO
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C 109/C 109M Test Method for Compressive Strength of
estimated in this test method is the same SO content for
Hydraulic Cement Mortars (Using 2-in. or [50-mm] Cube 3
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optimum performance of a concrete prepared from the cement.
Specimens)
3.5 The test method is applicable to cements specified in
C 114 Test Methods for Chemical Analysis of Hydraulic
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Specifications C 150, C 595, and C 1157.
Cement
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C 150 Specification for Portland Cement
4. Apparatus
C 204 Test Method for Fineness of Hydraulic Cement by
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4.1 Use the apparatus as specified in Test Method C 109/
Air Permeability Apparatus
C 109M.
C 305 Practice for Mechanical Mixing of Hydraulic Cement
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Pastes and Mortars of Plastic Consistency
5. Materials
C 471M Test Methods for Chemical Analysis of Gypsum
5.1 Calcium Sulfate—Use calcium sulfate for addition to
the cement that is either a high-grade natural gypsum having an
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SO content of at least 46 %, or the calcium sulfate from the
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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 Jan. 10, 2003. Published February 2003. Originally
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approved in 1965. Last previous edition approved in 2002 as C 563-02. 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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C563–03
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