1、Designation:C56317Standard Guide forApproximation of Optimum SO3in Hydraulic Cement1This standard is issued under the fixed designation C563;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parent
2、heses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This guide describes the determination of approximateoptimum SO3for maximum performance as a result of substi-tuting calcium sulfate for a portion of the
3、cement.1.2 This guide refers to the sulfur trioxide(SO3)content ofthe cement only.Slag cements and occasionally other hydrauliccements can contain sulfide or other forms of sulfur.Thedetermination of SO3content by rapid methods may includethese other forms,and may therefore produce a significanterro
4、r.If a significant error occurs,analyze the cement for SO3content using the reference test method of Test Methods C114for 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 thesafety concerns,if any,associated with its us
5、e.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C39/C39M Test Method for Compressive Strength of Cylin-drical Concrete Specim
6、ensC78 Test Method for Flexural Strength of Concrete(UsingSimple Beam with Third-Point Loading)C109/C109M Test Method for Compressive Strength ofHydraulic Cement Mortars(Using 2-in.or 50-mm CubeSpecimens)C114 Test Methods for Chemical Analysis of HydraulicCementC150 Specification for Portland Cement
7、C192 Practice for Making and Curing Concrete Test Speci-mens in the LaboratoryC204 Test Methods for Fineness of Hydraulic Cement byAir-Permeability ApparatusC305 Practice for Mechanical Mixing of Hydraulic CementPastes and Mortars of Plastic ConsistencyC430 Test Method for Fineness of Hydraulic Ceme
8、nt by the45-m(No.325)SieveC465 Specification for Processing Additions for Use in theManufacture of Hydraulic CementsC471M Test Methods for ChemicalAnalysis of Gypsum andGypsum Products(Metric)C595 Specification for Blended Hydraulic CementsC596 Test Method for Drying Shrinkage of Mortar Contain-ing
9、Hydraulic CementC1157 Performance Specification for Hydraulic CementC1437 Test Method for Flow of Hydraulic Cement MortarC1702 Test Method for Measurement of Heat of Hydrationof Hydraulic Cementitious Materials Using IsothermalConduction Calorimetry3.Significance and Use3.1 The purpose of this guide
10、 is to estimate the SO3contentfor a hydraulic cement that gives maximum performance.Thevalue obtained is one way to establish an appropriate level ofsulfate in the manufacture of cements specified in Specifica-tions C150,C595,and C1157.3.2 The SO3content of a cement giving maximum perfor-mance is di
11、fferent at different ages,with different performancecriteria and with different materials such supplementary ce-mentitious materials and chemical admixtures.A manufacturercan choose the performance criteriato determine optimum SO3content.This optimum SO3content may be a compromisebetween different a
12、ges and different performance criteria.NOTE1Typically,the optimum SO3content is higher the later the age.3.3 This guide indicates optimum SO3content for cement inmortar made and cured at a standard temperature of 23.0 62.0C(73.5 6 3.5F).The optimum SO3increases withincreasing temperature and may inc
13、rease when water-reducingadmixtures are used.3.4 It should not be assumed that the optimum SO3esti-mated in this guide is the same SO3content for optimumperformance of a concrete prepared from the cement.3.5 The guide is applicable to cements specified in Specifi-cations C150,C595,and C1157.1This gu
14、ide is under the jurisdiction of ASTM Committee C01 on Cement andis the direct responsibility of Subcommittee C01.28 on Sulfate ContentCurrent edition approved Feb.1,2017.Published March 2017.Originallyapproved in 1965.Last previous edition approved in 2016 as C563 16.DOI:10.1520/C0563-17.2For refer
15、enced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright A
16、STM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 4.Apparatus4.1 Use the apparatus as specified in Test Methods C109/C109M,C192,C596,or C
