ASTM C1064 C1064M-2008 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: C 1064/C 1064M 08Standard 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 () 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 de

3、termination 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. Within the text, SI units areshown in brackets. The values stated in each system may not beexact equivalents; therefore, each system

4、 shall be used inde-pendently of the other. Combining values from the two systemsmay result in non-conformance with the standard.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

5、not beconsidered 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 r

6、egulatory 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 an

7、d Bias Statementsfor Test Methods for Construction Materials3. 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

8、of the freshly mixedconcrete at a later time. It may be used to verify conformanceto a specified requirement for temperature of concrete.3.2 Concrete containing aggregate of a nominal maximumsize greater than 3 in. 75 mm may require up to 20 min for thetransfer of heat from aggregate to mortar. (See

9、 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 measuring device; concrete cover must also be atleast three times the nominal maximum size of the coarseaggregate.4.2 Temper

10、ature Measuring Device, shall be capable ofaccurately measuring the temperature of the freshly mixedconcrete to 61F6 0.5 C throughout a range of 30 to 120F 0 to 50 C. The design of the temperature measuringdevice shall be such that it allows 3 in. 75 mm or moreimmersion during operation.4.3 Partial

11、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 Reference Temperature Measuring Device, shall bereadable and accurate to 6 0.5 F 0.2 C at the verificationpoints in 5.1. A certifi

12、cate or report that verifies the accuracyshall be available 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

13、. The certificate or report shall providedocumentation that the reference standard used in the verifi-cation is traceable to the National Institute of Standards andTechnology (NIST).5. Calibration of Temperature Measuring Device5.1 Each temperature measuring device used for determin-ing temperature

14、of freshly mixed concrete shall be calibrated1This 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 July 1, 2008. Published August 2008. Originallya

15、pproved in 1986. Last previous edition approved in 2005 as C 1064 05.2Section 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.

16、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, FarmingtonHills, MI 48333-9094, http:/www.concrete.org.1*A Summary of Changes section appears at the end of this

17、 standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.annually, or whenever there is a question of accuracy. Thiscalibration shall be performed by comparing the readings of thetemperature measuring device at two temperatures at le

18、ast 30F 15 C apart.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 F0.2 C during the period of the test.5.2.2 Have both the temperature and reference t

19、emperaturemeasuring 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 containing liquid to avoidadhesion of the liquid to the glass if the temperature exposurei

20、s 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 temperaturemeasuring device has at least 3 in. 75 mm of concrete coverin all directions.6.2 If the

21、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.6.2.2 Sample the freshly mixed concrete in accordance withPractice C 172, except that

22、 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 device so that theend of the temperature sensing portion is submerged a mini-mum of

23、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 temperature from affecting thereading.7.2 Leave the temperature measuring device in the freshly

24、mixed concrete for at least 2 min but not more than 5 min, thenread and record the temperature to the nearest 1 F 0.5 C. Donot remove the device from the concrete when reading thetemperature.8. Report8.1 Report the measured temperature of the freshly mixedconcrete to the nearest 1 F 0.5 C.9. Precisi

25、on 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 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 deviatio

26、n 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 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

27、 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 statement onbias is being made.10. Keywords10.1 freshly mixed concrete; temperature; temperature mea-suring deviceSUMMARY OF CHANGESCommittee C

28、09 has identified the location of selected changes to this specification since the last issue,C 1064/C 1064M 05, that may impact the use of this specification. (Approved July 1, 2008)(1) Revised 3.1 to clarify what the recorded temperaturerepresents.(2) Revised 7.2 and 8.1.(3) Deleted 7.3 and Note 4

29、.5These numbers represent, respectively, the (1s) and (d2s) limits as described inPractice 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 082ASTM International takes no position respecting the val

30、idity 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 any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is sub

31、ject 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 invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headqua

32、rters. 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 received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standa

33、rd 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 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 083