ASTM C1064 C1064M-2005 Standard Test Method for Temperature of Freshly Mixed Hydraulic-Cement Concrete.pdf

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1、Designation: C 1064/C 1064M 05Standard Test Method forTemperature of Freshly Mixed Hydraulic-Cement Concrete1This standard is issued under the fixed designation C 1064/C 1064M; the number immediately following the designation indicates theyear of original adoption or, in the case of revision, the ye

2、ar of last revision. A number in parentheses indicates the year of lastreapproval. A superscript epsilon (e) 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 d

3、etermination of tempera-ture of freshly mixed hydraulic-cement concrete.1.2 The values stated in inch-pound or SI units are to beregarded separately as standard. Within the text, SI units areshown in brackets. The values stated in each system are notexact equivalents; therefore, each system shall be

4、 used inde-pendently of the other. Combining values from the two systemsmay result in nonconformance with the specification.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 b

5、econsidered as requirements of this 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 and health practices and determine the applica-bility of regula

6、tory 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:3C 172 Practice for Sampling Freshly Mixed ConcreteC 670 Practice for Preparing Precision and Bia

7、s Statementsfor Test Methods for Construction Materials3. Significance and Use3.1 This test method provides a means for measuring thetemperature of freshly mixed concrete. It may be used to verifyconformance to a specified requirement for temperature ofconcrete.3.2 Concrete containing aggregate of a

8、 nominal maximumsize greater than 3 in. 75 mm may require up to 20 min for thetransfer of heat from aggregate to mortar. (See ACI Committee207.1R Report.4)4. Apparatus4.1 Container, shall be large enough to provide at least 3 in.75 mm of concrete in all directions around the sensor of thetemperature

9、 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 measuring the temperature of the freshly mixedconcrete to 61F60.5 C throughout a range of 30 to 120F 0 to 50 C. The desig

10、n of the temperature measuringdevice shall be such that it allows 3 in. 75 mm or moreimmersion during operation.4.3 Partial immersion liquid-in-glass thermometers (andpossibly other types) shall have a permanent mark to which thedevice must be immersed without applying a correction factor.4.4 Refere

11、nce Temperature Measuring Device, shall bereadable and accurate to 60.5 F 0.2 C at the verificationpoints in 5.1. A certificate or report that verifies the accuracyshall be available in the laboratory for review. Accuracy ofliquid-in-glass reference temperature measuring devices shallbe verified onc

12、e. Verification of direct-reading resistance ref-erence temperature measuring devices shall be performedevery twelve months. The certificate or report shall providedocumentation that the reference standard used in the verifi-cation is traceable to the National Institute of Standards andTechnology (N

13、IST).5. Calibration of Temperature Measuring Device5.1 Each temperature measuring device used for determin-ing temperature of freshly mixed concrete shall be calibratedannually, or whenever there is a question of accuracy. Thiscalibration shall be performed by comparing the readings of thetemperatur

14、e measuring device at two temperatures at least 30F 15 C apart.1This 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 Concrete .Current edition approved Jan. 1, 2005. Published Janua

15、ry 2005. Originallyapproved in 1986. Last previous edition approved in 2004 as C 1064 04.2Section 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 Ser

16、vice 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, Box 9094, Farmington Hills, MI48333.1*A Summary of Changes section appears at the end of this standard.Copyright

17、ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.2 Calibration of the temperature measuring devices maybe made in oil or other suitable baths having uniform densityif provision is made to:5.2.1 Maintain the bath temperature constant within 0.5

18、 F0.2 C during the period of the test.5.2.2 Have both the temperature and reference temperaturemeasuring devices maintained in the bath for a minimum of 5min before reading temperatures.5.2.3 Continuously circulate the bath liquid to provide auniform temperature.5.2.4 Slightly tap thermometers conta

19、ining liquid to avoidadhesion of the liquid to the glass if the temperature exposureis being reduced.6. Sampling 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 temperaturemea

20、suring device has at least 3 in. 75 mm of concrete coverin all directions.6.2 If the transporting equipment or 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.

21、6.2.2 Sample the freshly mixed concrete in accordance withPractice C 172, except that composite samples are not 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

22、 device so that theend of the temperature sensing portion is submerged a mini-mum of 3 in. 75 mm into the freshly 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 temperatur

23、e from affecting thereading.7.2 Leave the temperature measuring device in the freshlymixed concrete for a minimum period of 2 min or until thetemperature reading stabilizes, then read and record the tem-perature.7.3 Complete the temperature measurement of the freshlymixed concrete within 5 min after

24、 obtaining the sample, exceptfor concrete that contains a nominal maximum size aggregategreater than 3 in. 75 mm. With aggregate greater than 3 in.75 mm, make sure that the temperature has stabilized beforerecording the reading (See Note 1).NOTE 1It may require as much as 20 min before the temperatu

25、re isstabilized after mixing.8. Report8.1 Record the measured temperature of the freshly mixedconcrete to the nearest 1 F 0.5 C.9. Precision and Bias9.1 The single operator standard deviation for measurementof concrete temperature has been found to be 0.5 F.5Therefore, results of two properly conduc

26、ted 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 concrete temperature on the same sample has beenfound to be 0.7 F.5Therefore, two tests properly conducted bydifferent operators but on

27、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 concrete batches ataround 75 F.69.4 Since there is no accepted reference material suitablefor determining the bias of this test method, no state

28、ment onbias is being made.10. Keywords10.1 freshly mixed concrete; temperature; temperature mea-suring deviceSUMMARY OF CHANGESCommittee C09 has identified the location of selected changes to this specification since the last issue,C 1064/C 1064M 04, that may impact the use of this specification (Ap

29、proved January 1, 2005).(1) Deleted old 9.1 and replaced with new 9.1-9.4 and Note 1.Committee C09 has identified the location of selected changes to this specification since the last issue,C 1064/C 1064M 03, that may impact the use of this specification (Approved June 1, 2004).(1) Changed the title

30、 of the standard.(2) Revised 1.1.(3) Added new 1.3 and renumbered subsequent sections.(4) Added to 1.4 safety caveat.(5) Revised 4.1.(6) Combined 6.1 and 6.2 into a new and revised 6.1.(7) Deleted 6.3.4.(8) Revised 7.3.5These numbers represent, respectively, the (1s) and (d2s) limits as described in

31、Practice C 670.6Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR: C09-1028.C 1064/C 1064M 052(9) Added Note 1.Committee C09 has identified the location of selected changes to this specification since the last issue,C 1064/C 1064M

32、01, that may impact the use of this specification (Approved October 10, 2003).(1) Revised 4.2 to require a temperature-measuring device toaccommodate a 3 in. minimum immersion in the concrete.(2) Revised 7.1 for clarity.ASTM International takes no position respecting the validity of any patent right

33、s asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any t

34、ime by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will

35、 receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received 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

36、 International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of 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).C 1064/C 1064M 053