ASTM_C_1679_-_14.pdf

Designation:C167914Standard Practice forMeasuring Hydration Kinetics of Hydraulic CementitiousMixtures Using Isothermal Calorimetry1This standard is issued under the fixed designation C1679;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 practice describes the apparatus and procedure formeasuring relative differences in hydration kinetics of hydrau-lic cementitious mixtures,either in paste or mortar(see Note1),including those containing admixtures,various supplemen-tary cementitious materials(SCM),and other fine materials bymeasuring the thermal power using an isothermal calorimeter.NOTE1Paste specimens are often preferred for mechanistic researchwhen details of individual reaction peaks are important or for particularcalorimetry configurations.Mortar specimens may give results that havebetter correlation with concrete setting and early strength developmentand are often preferred to evaluate different mixture proportions forconcrete.Both paste and mortar studies have been found to be effective inevaluating concrete field problems due to incompatibility of materialsused in concrete mixtures.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 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 and health practices and determine the applica-bility of regulatory limitations prior to use.(WarningFreshhydraulic cementitious mixtures are caustic and may causechemical burns to skin and tissue upon prolonged exposure.2)2.Referenced Documents2.1 ASTM Standards:3C125 Terminology Relating to Concrete and Concrete Ag-gregatesC172 Practice for Sampling Freshly Mixed ConcreteC219 Terminology Relating to Hydraulic CementC305 Practice for Mechanical Mixing of Hydraulic CementPastes and Mortars of Plastic ConsistencyC403/C403M Test Method for Time of Setting of ConcreteMixtures by Penetration ResistanceC511 Specification for Mixing Rooms,Moist Cabinets,Moist Rooms,and Water Storage Tanks Used in theTesting of Hydraulic Cements and ConcretesC778 Specification for SandC1005 Specification for Reference Masses and Devices forDetermining Mass and Volume for Use in the PhysicalTesting of Hydraulic CementsC1602/C1602M Specification for Mixing Water Used in theProduction of Hydraulic Cement Concrete2.2 Other Standard:API Specification RP 10B-2/ISO 10426-2 RecommendedPractice for Testing Well Cements43.Terminology3.1 DefinitionsFor definitions of terms used in thispractice,refer to Terminology C125 and Terminology C219.3.2 Definitions of Terms Specific to This Standard:3.2.1 baseline,nthe signal from the calorimeter whenthere is an inert specimen in the instrument.3.2.2 calcium aluminate,nvarious aluminate phases in-cluding but not limited to the tricalcium aluminate and ferritephases in portland cement clinker,calcium aluminate phasesoccurring in some supplementary cementitious materials,andcalcium-alumino-silicate glasses also occurring in somesupplementary cementitious materials,that are capable ofconsuming the sulfate phases present in hydrating cementitioussystems.3.2.3 calibration coeffcient,na factor that relates thevalue recorded by the data acquisition system to the thermalpower output.3.2.3.1 DiscussionNormally recorded data are in volts andthe calibration coefficient has units of watts per volt(W/V).Some calorimeters may have internal automatic calibration andwill give the output in watts without the user having to specifythe calibration coefficient.1This practice is under the jurisdiction of ASTM Committee C09 on Concreteand ConcreteAggregates and is the direct responsibility of Subcommittee C09.48 onPerformance of Cementitious Materials and Admixture Combinations.Current edition approved June 1,2014.Published June 2014.Originallyapproved in 2007.Last previous edition approved in 2013 as C1679 13.DOI:10.1520/C1679-14.2Section on Safety Precautions,Manual of Aggregate and Concrete Testing,Annual Book of ASTM Standards,Vol 04.02.3For 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.4Available from American Petroleum Institute(API),1220 L.St.,NW,Washington,DC 20005-4070,http:/api-ec.api.org.*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 States1 3.2.4 combined mixture,ncombination of all the materialsthat are introduced into the calorimeter for measuring hydra-tion kinet