ASTM C563-07
(Test Method)Standard Test Method for Approximation of Optimum SO3 in Hydraulic Cement Using Compressive Strength
Standard Test Method for Approximation of Optimum SO<sub>3</sub> in Hydraulic Cement Using Compressive Strength
SIGNIFICANCE AND USE
The purpose of this test method is to estimate the SO3 content for a hydraulic cement that gives maximum compressive strength in mortar made and cured at 23 °C. The value obtained is used to establish an appropriate level of sulfate in the manufacture of cements specified in Specifications C 150, C 595 and C 1157. In Specifications C 150 and C 595 it is used to justify exceeding the prescriptive limits for SO3.
The SO3 content of a cement giving maximum compressive strength is different at different ages of mortar; typically this SO3 content is higher at 3 days than the 24-h, and often higher for 7 days than that for 3 days. A manufacturer can choose the age of 24-h, 3 days or 7 days for specimens at which to determine optimum SO3 content.
This test method indicates optimum SO3 content for cement in mortar made and cured at a standard temperature of 23.0 ± 2.0 °C (73.5 ± 3.5 °F). The optimum SO3 increases with increasing temperature and may increase when water-reducing admixtures are used.
It should not be assumed that the optimum SO 3 estimated in this test method is the same SO3 content for optimum performance of a concrete prepared from the cement.
The test method is applicable to cements specified in Specifications C 150, C 595, and C 1157.
SCOPE
1.1 This test method describes the determination of approximate optimum SO3 for maximum compressive strength at 24 h, 3 days, or 7 days by measuring the change in strength produced in hydraulic cement mortar as a result of substituting calcium sulfate for a portion of the cement.
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.
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Standards Content (Sample)
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Designation: C563 − 07
StandardTest Method for
Approximation of Optimum SO in Hydraulic Cement Using
3
1
Compressive Strength
This standard is issued under the fixed designation C563; 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* Pastes and Mortars of Plastic Consistency
C471M Test Methods for ChemicalAnalysis of Gypsum and
1.1 Thistestmethoddescribesthedeterminationofapproxi-
Gypsum Products (Metric)
mateoptimumSO formaximumcompressivestrengthat24h,
3
C511 Specification for Mixing Rooms, Moist Cabinets,
3days,or7daysbymeasuringthechangeinstrengthproduced
Moist Rooms, and Water Storage Tanks Used in the
in hydraulic cement mortar as a result of substituting calcium
Testing of Hydraulic Cements and Concretes
sulfate for a portion of the cement.
C595 Specification for Blended Hydraulic Cements
1.2 This test method refers to the sulfur trioxide (SO )
3
C778 Specification for Sand
content of the cement only. Slag cements and occasionally
C1157 Performance Specification for Hydraulic Cement
other hydraulic cements can contain sulfide or other forms of
C1437 Test Method for Flow of Hydraulic Cement Mortar
sulfur.ThedeterminationofSO contentbyrapidmethodsmay
3
include these other forms, and may therefore produce a
3. Significance and Use
significant error. If a significant error occurs, analyze the
cement for SO content using the reference test method of Test
3.1 The purpose of this test method is to estimate the SO
3
3
Methods C114 for sulfur trioxide.
content for a hydraulic cement that gives maximum compres-
sive strength in mortar made and cured at 23 °C. The value
1.3 Values stated as SI units are to be regarded as standard.
obtained is used to establish an appropriate level of sulfate in
1.4 This standard does not purport to address all of the
the manufacture of cements specified in Specifications C150,
safety concerns, if any, associated with its use. It is the
C595 and C1157. In Specifications C150 and C595 it is used to
responsibility of the user of this standard to establish appro-
justify exceeding the prescriptive limits for SO .
3
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
3.2 TheSO contentofacementgivingmaximumcompres-
3
sive strength is different at different ages of mortar; typically
2. Referenced Documents
this SO content is higher at 3 days than the 24-h, and often
3
2
higher for 7 days than that for 3 days. A manufacturer can
2.1 ASTM Standards:
C109/C109M Test Method for Compressive Strength of choosetheageof24-h,3daysor7daysforspecimensatwhich
Hydraulic Cement Mortars (Using 2-in. or [50-mm] Cube to determine optimum SO content.
3
Specimens)
3.3 This test method indicates optimum SO content for
3
C114 Test Methods for Chemical Analysis of Hydraulic
cement in mortar made and cured at a standard temperature of
Cement
23.0 6 2.0 °C (73.5 6 3.5 °F). The optimum SO increases
3
C150 Specification for Portland Cement
with increasing temperature and may increase when water-
C204 Test Methods for Fineness of Hydraulic Cement by
reducing admixtures are used.
Air-Permeability Apparatus
C305 Practice for Mechanical Mixing of Hydraulic Cement
3.4 It should not be assumed that the optimum SO esti-
3
mated in this test method is the same SO content for optimum
3
performance of a concrete prepared from the cement.
1
This test method is under the jurisdiction ofASTM Committee C01 on Cement
3.5 The test method is applicable to cements specified in
and is the direct responsibility of Subcommittee C01.28 on Sulfate Content
Current edition approved April 1, 2007. Published May 2007. Originally
Specifications C150, C595, and C1157.
approved in 1965. Last previous edition approved in 2004 as C563-04. DOI:
10.1520/C0563-07.
2 4. Apparatus
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
4.1 Use the apparatus as specified in Test Method C109/
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. C109M.
*A Summary of Changes section appears at the end of this standard
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C563 − 07
5. Materials 7. Temperature and Humidity
5.1 CalciumSulfate—Usecalciumsulfateforadditiontothe 7.1 The temperature and humidity of the moist cabinet or
cement that is either a high-grade natural gypsum having an moist room shall be as specified in Specification C511.
S
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