ASTM C1702-2013a Standard Test Method for Measurement of Heat of Hydration of Hydraulic Cementitious Materials Using Isothermal Conduction Calorimetry《利用等温量热传导测量水硬性胶凝材料水合热的标准试验方法》.pdf
《ASTM C1702-2013a Standard Test Method for Measurement of Heat of Hydration of Hydraulic Cementitious Materials Using Isothermal Conduction Calorimetry《利用等温量热传导测量水硬性胶凝材料水合热的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM C1702-2013a Standard Test Method for Measurement of Heat of Hydration of Hydraulic Cementitious Materials Using Isothermal Conduction Calorimetry《利用等温量热传导测量水硬性胶凝材料水合热的标准试验方法》.pdf(8页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: C1702 13aStandard 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
2、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
3、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 un
4、its 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 pra
5、ctices 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 HydraulicCementC670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsC1679 Practice for Me
6、asuring 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 th
7、e 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 m
8、easures 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 refe
9、rence 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 r
10、andom noise (standard deviation) in thebaseline signal.3.1.6 thermal mass, nthe ability of a material to storethermal energy (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. The specific heat capacity of a
11、 typical portlandcement and water is 0.75 and 4.18 J/g/K, respectively.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 wa
12、tt is also a common unit ofmeasure used to represent thermal power.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 conductivi
13、ty. One heat-flow sensorand sample holder contains the sample of interest. The other1This test method is under the jurisdiction ofASTM Committee C01 on Cementand is the direct responsibility of Subcommittee C01.26 on Heat of Hydration.Current edition approved Dec. 15, 2013. Published February 2014.
14、Originallyapproved in 2009. Last previous edition approved in 2013 as C170213. DOI:10.1520/C1702-13A.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 D
15、ocument 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 States1heat-flow sensor is a reference cell containing a blank samplethat evolves no hea
16、t. The heat of hydration released by thereacting cementitious sample flows across the sensor and intothe heat sink. The output from the calorimeter is the differencein heat flow (thermal power) between the sample cell and thereference cell. The heat-flow sensor actually senses a smalltemperature gra
17、dient that develops across the device, howeverthe heat is removed from the hydrating sample fast enoughthat, for practical purposes, the sample remains at a constanttemperature (isothermal).4.2 The output from the heat-flow sensor is an electricalvoltage signal that is proportional to the thermal po
18、wer fromthe sample. This output must be calibrated to a known thermalpower. In this method this is accomplished by measurementson a heat source that emits a constant and known thermalpower. The integral of the thermal power over the time of thetest is the heat of hydration. Alternatively, a cementit
19、iousmaterial with a known heat of hydration can be used forcalibration as described in Appendix X1.4.3 Two methods are described. In MethodAthe sample andwater are both temperature equilibrated and mixed inside thecalorimeter. This method is the most direct way to determineheat of hydration. In Meth
20、od B the sample is mixed in thesample vial outside of the calorimeter using temperatureequilibrated materials then put into the calorimeter. Thismethod offers certain practicality, but depending on the mate-rials being analyzed and procedures used for mixing andhandling, this method may suffer from
21、small errors due toperiods of hydration being missed or spurious heat beingintroduced or taken away from the calorimeter during setup orcombinations thereof.5. Significance and Use5.1 This method is suitable for determining the total heat ofhydration of hydraulic cement at constant temperature at ag
22、esup to 7 days to confirm specification compliance. It gives testresults equivalent to Test Method C186 up to 7 days of age(Poole (2007) (1).5.2 This method compliments Practice C1679 by providingdetails of calorimeter equipment, calibration, and operation.Practice C1679 emphasizes interpretation si
23、gnificant events incement hydration by analysis of time dependent patterns ofheat flow, but does not provide the level of detail necessary togive precision test results at specific test ages required forspecification compliance.6. Apparatus6.1 Miscellaneous Equipment:6.1.1 BalanceAccurate to 0.01 g.
24、6.1.2 Volumetric DispenserA device for measuring vol-ume or mass of water, accurate to 0.1 mL. This could be asyringe, pipette, or weighing device.6.1.3 Sample HolderA device that holds the cement pasteand provides intimate contact with the calorimeter heat sensingdevice and prevents evaporation of
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