ASTM C1064 C1064M-2011 Standard Test Method for Temperature of Freshly Mixed Hydraulic-Cement Concrete《新拌水硬水泥混凝土温度的标准试验方法》.pdf

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1、Designation: C1064/C1064M 11Standard Test Method forTemperature of Freshly Mixed Hydraulic-Cement Concrete1This standard is issued under the fixed designation C1064/C1064M; the number immediately following the designation indicates theyear of original adoption or, in the case of revision, the year o

2、f last revision. A number in parentheses indicates the year of lastreapproval. A superscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope*1.1 This test method covers the determ

3、ination of tempera-ture of freshly mixed hydraulic-cement concrete.1.2 The values stated in either SI or inch-pound units are tobe regarded separately as standard. The values stated in eachsystem may not be exact equivalents; therefore, each systemshall be used independently of the other. Combining

4、valuesfrom the two systems may result in non-conformance with thestandard.1.3 The text of this standard references notes and footnotesthat provide explanatory information. These notes and foot-notes (excluding those in tables and figures) shall not beconsidered as requirements of this standard.1.4 T

5、his 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. (WarningFreshhydrau

6、lic cementitious mixtures are caustic and may causechemical burns to skin and tissue upon prolonged exposure.2)2. Referenced Documents2.1 ASTM Standards:3C172 Practice for Sampling Freshly Mixed ConcreteC670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction Materi

7、als3. Significance and Use3.1 This test method provides a means for measuring thetemperature of freshly mixed concrete. The measured tempera-ture represents the temperature at the time of testing and maynot be an indication of the temperature of the freshly mixedconcrete at a later time. It may be u

8、sed to verify conformanceto a specified requirement for temperature of concrete.3.2 Concrete containing aggregate of a nominal maximumsize greater than 75 mm 3 in. may require up to 20 min for thetransfer of heat from aggregate to mortar. (See ACI Committee207.1R Report.4)4. Apparatus4.1 Container,

9、shall be large enough to provide at least 75mm 3 in. of concrete in all directions around the sensor of thetemperature measuring device; concrete cover must also be atleast three times the nominal maximum size of the coarseaggregate.4.2 Temperature Measuring Device, shall be capable ofaccurately mea

10、suring the temperature of the freshly mixedconcrete to 6 0.5 C 61 F throughout a range of 0 to 50 C30 to 120 F. The design of the temperature measuringdevice shall be such that it allows 75 mm 3 in. or moreimmersion during operation.4.3 Partial immersion liquid-in-glass thermometers (andpossibly oth

11、er types) shall have a permanent mark to which thedevice must be immersed without applying a correction factor.4.4 Reference Temperature Measuring Device, shall bereadable and accurate to 6 0.2 C 0.5 F at the verificationpoints in 5.1. A certificate or report that verifies the accuracyshall be avail

12、able in the laboratory for review. Accuracy ofliquid-in-glass reference temperature measuring devices shallbe verified once. Verification of direct-reading resistance ref-erence temperature measuring devices shall be performedevery twelve months. The certificate or report shall providedocumentation

13、that the reference standard used in the verifi-cation is traceable to the National Institute of Standards andTechnology (NIST).5. Verification of the Accuracy of TemperatureMeasuring Devices5.1 The accuracy of each temperature measuring deviceused for determining the temperature of freshly mixed con

14、creteshall be verified annually, or whenever there is a question ofaccuracy. Verify the accuracy of the temperature measuring1This test method is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregates and is the direct responsibility of SubcommitteeC09.60 on Testing Fresh Co

15、ncrete.Current edition approved Dec. 1, 2011. Published January 2012. Originallyapproved in 1986. Last previous edition approved in 2008 as C106408. DOI:10.1520/C1064_C1064M-11.2Section on Safety Precautions, Manual of Aggregate and Concrete Testing,Annual Book of ASTM Standards, Vol 04.02.3For refe

16、renced 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 Concrete Institute (ACI), P.O. Box 9094, Farm

17、ingtonHills, MI 48333-9094, http:/www.concrete.org.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.device by comparing the readings of the reference temperaturemeasuri

18、ng device to the temperature measuring device at twotemperatures at least 15 C 30 F apart.5.2 Verification of the accuracy of the temperature measur-ing devices may be made in oil or other suitable bath liquidshaving uniform density if provision is made to:5.2.1 Maintain the bath temperature constan

19、t within 0.2 C0.5 F during the verification process.5.2.2 Continuously circulate the bath liquid to provide auniform temperature throughout the bath.5.2.3 Suspend the temperature measuring devices in such amanner that the devices are not contacting the sides or bottomof the bath container during ver

20、ification.5.3 Place both the temperature and reference temperaturemeasuring devices in the bath for at least 5 min before readingtemperatures at the test points specified in 5.1.5.4 Prior to reading the temperature measuring devices, ifthe temperature in the bath has been reduced, slightly tapthermo

21、meters containing liquid to avoid adhesion of the liquidto the glass.5.5 Read and record the temperature of both the referencetemperature measuring device and the temperature measuringdevice. Reject the temperature measuring device if the differ-ence in readings exceeds 0.5 C 1 F at either test poin

22、t. If theindicator of the rejected temperature measuring device isadjustable, reverification is permitted after adjustment. Inaddition to the temperature readings, record the identificationnumbers of both devices used, the date verified, and the nameof individual performing the verification.6. Sampl

23、ing Concrete6.1 It is acceptable to measure the temperature of freshlymixed concrete in either the transporting equipment or theforms after discharge provided the sensor of the temperaturemeasuring device has at least 75 mm 3 in. of concrete coverin all directions.6.2 If the transporting equipment o

24、r placement forms are notused as the container, a sample shall be prepared as follows:6.2.1 Immediately, prior to sampling the freshly mixedconcrete, dampen (with water) the sample container.6.2.2 Sample the freshly mixed concrete in accordance withPractice C172, except that composite samples are no

25、t requiredif the only purpose for obtaining the sample is to determinetemperature.6.2.3 Place the freshly mixed concrete into the container.7. Procedure7.1 Position the temperature measuring device so that theend of the temperature sensing portion is submerged a mini-mum of 75 mm 3 in. into the fres

26、hly mixed concrete. Closethe void left by the placement by gently pressing the concretearound the temperature measuring device at the surface of theconcrete to prevent ambient air temperature from affecting thereading.7.2 Leave the temperature measuring device in the freshlymixed concrete for at lea

27、st 2 min but not more than 5 min, thenread and record the temperature to the nearest 0.5 C 1 F. Donot remove the device from the concrete when reading thetemperature.8. Report8.1 Report the measured temperature of the freshly mixedconcrete to the nearest 0.5 C 1 F.9. Precision and Bias9.1 The single

28、 operator standard deviation for measurementof concrete temperature has been found to be 0.5 F.5Therefore, results of two properly conducted tests by the sameoperator on the same sample of material should not differ bymore than 1.3 F.59.2 The multi-operator standard deviation for the measure-ment of

29、 concrete temperature on the same sample has beenfound to be 0.7 F.5Therefore, two tests properly conducted bydifferent operators but on the same material should not differby more than 1.9 F.59.3 The precision values given were derived from an inter-laboratory study using 11 operators on two concret

30、e batches ataround 75 F.69.4 Since there is no accepted reference material suitablefor determining the bias of this test method, no statement onbias is being made.10. Keywords10.1 freshly mixed concrete; temperature; temperature mea-suring device5These numbers represent, respectively, the (1s) and (

31、d2s) limits as described inPractice C670.6Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:C09-1028.C1064/C1064M 112SUMMARY OF CHANGESCommittee C09 has identified the location of selected changes to this specification since the la

32、st issue,C1064/C1064M08, that may impact the use of this specification. (Approved December 1, 2011)(1) Revised 1.2 to conform to the ASTM Form and Style. (2) Revised Section 5 to require documentation of verification,list the tolerance for rejecting thermometers, clarify the re-quirements for a liqu

33、id bath, and change the term used from“calibration” to “verification.”ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of a

34、ny such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are

35、invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not recei

36、ved a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of

37、 this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).C1064/C1064M 113