ASTM_C_1702_-_17.pdf

Designation:C170217Standard Test Method forMeasurement of Heat of Hydration of HydraulicCementitious Materials Using Isothermal ConductionCalorimetry1This standard is issued under the fixed designation C1702;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 test method specifies the apparatus and procedurefor determining total heat of hydration of hydraulic cementi-tious materials at test ages up to 7 days by isothermalconduction calorimetry.1.2 This test method also outputs data on rate of heat ofhydration versus time that is useful for other analyticalpurposes,as covered in Practice C1679.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C186 Test Method for Heat of Hydration of HydraulicCementC1679 Practice for Measuring Hydration Kinetics of Hy-draulic Cementitious Mixtures Using Isothermal Calorim-etryE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 baseline,nthe time-series signal from the calorim-eter when measuring output from a sample of approximatelythe same mass and thermal properties as a cement sample,butwhich is not generating or consuming heat.3.1.2 heat,nthe time integral of thermal power measuredin joules(J).3.1.3 isothermal conduction calorimeter,na calorimeterthat measures heat flow from a sample maintained at a constanttemperature by intimate thermal contact with a constanttemperature heat sink.3.1.4 reference cell,na heat-flow measuring cell that isdedicated to measuring power from a sample that is generatingno heat.3.1.4.1 DiscussionThe purpose of the reference cell is tocorrect for baseline drift and other systematic errors that canoccur in heat-flow measuring equipment.3.1.5 sensitivity,nthe minimum change in thermal powerreliably detectable by an isothermal calorimeter.3.1.5.1 DiscussionFor this application,sensitivity is takenas ten times the random noise(standard deviation)in thebaseline signal.3.1.6 thermal mass,nthe amount of thermal energy thatcan be stored by a material(J/K).3.1.6.1 DiscussionThe thermal mass of a given material iscalculated by multiplying the mass by the specific heat capacityof the material.For the purpose of calculating the thermal massused in this standard,the following specific heat capacities canbe used:The specific heat capacity of a typical unhydratedportland cement and water is 0.75 and 4.18 J/(gK),respec-tively.Thus a mixture of A g of cement and B g of water hasa thermal mass of(0.75 A+4.18 B)J/K.The specific heatcapacity of typical quartz and limestone is 0.75 and0.84 J(gK),respectively.The specific heat capacity of mostamorphous supplementary cementitious material,such as flyash or slag,is approximately 0.8 J/(gK).3.1.7 thermal power,nthe heat production rate measuredin joules per second(J/s).3.1.7.1 DiscussionThis is the property measured by thecalorimeter.The thermal power unit of measure is J/s,which isequivalent to the watt.The watt is also a common unit ofmeasure used to represent thermal power.1This test method is under the jurisdiction of ASTM Committee C01 on Cementand is the direct responsibility of Subcommittee C01.26 on Heat of Hydration.Current edition approved Feb.1,2017.Published February 2017.Originallyapproved in 2009.Last previous edition approved in 2015 as C1702 15b.DOI:10.1520/C1702-17.2For 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 4.Summary of Test Method4.1 PrincipleAn isothermal heat conduction calorimeterconsists of a constant-temperature heat sink to which twoheat-flow sensors and sample holders are attached in a mannerresulting in good thermal conductivity.One heat-flow sensorand sample holder contai