ASTM_C_563_-_18a.pdf

Designation:C56318aStandard 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 parentheses 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 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 significanterror.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 use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2C39/C39M Test Method for Compressive Strength of Cylin-drical Concrete SpecimensC78/C78M Test Method for Flexural Strength of Concrete(Using Simple 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/C150M Specification for Portland CementC192/C192M Practice for Making and Curing Concrete TestSpecimens 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 Cement 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/C595M Specification for Blended Hydraulic CementsC596 Test Method for Drying Shrinkage of Mortar Contain-ing Hydraulic CementC1157/C1157M Performance Specification for HydraulicCementC1437 Test Method for Flow of Hydraulic Cement MortarC1679 Practice for Measuring Hydration Kinetics of Hy-draulic Cementitious Mixtures Using Isothermal Calorim-etryC1702 Test Method for Measurement of Heat of Hydrationof Hydraulic Cementitious Materials Using IsothermalConduction Calorimetry3.Significance and Use3.1 The purpose of this guide 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/C150M,C595/C595M,and C1157/C1157M.3.2 The SO3content of a cement giving maximum perfor-mance is different 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 ages and different performance criteria.NOTE1Typically,the optimum SO3content is higher the later the age.1This guide is under the jurisdiction of ASTM Committee C01 on Cement andis the direct responsibility of Subcommittee C01.28 on Sulfate ContentCurrent edition approved Dec.1,2018.Published March 2019.Originallyapproved in 1965.Last previous edition approved in 2018 as C563 18.DOI:10.1520/C0563-18A.2For referenced 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 ASTM 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 3.3 This guide indicates optimum SO3content for cement,optionally in presence