ASTM C1362-2004 Standard Test Method for Flow of Freshly Mixed Hydraulic Cement Concrete《新拌水凝水泥混凝土流动性的标准试验方法》.pdf

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1、Designation: C 1362 04Standard Test Method forFlow of Freshly Mixed Hydraulic-Cement Concrete1This standard is issued under the fixed designation C 1362; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A

2、number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This test method covers determination of the flow of asample of freshly mixed concrete, either in the field or in thelaboratory.1.2 T

3、his test method is applicable to concrete having coarseaggregate up to 37.5 mm in size. If the coarse aggregate islarger than 37.5 mm in size, the test method is applicable whenthe fraction of concrete larger than 37.5 mm is removed inaccordance with Practice C 172.1.3 The values stated in SI units

4、are the standard.1.4 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.1.5 This standard does not purport to address all of thesafety

5、 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. (WarningFreshhydraulic cementitious mixtures are caustic and may causechemic

6、al 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 Bias Statementsfor Test Methods for Construction Materials3. Summary of Test Method3.1 A flow apparatus compri

7、sing an outer partially perfo-rated hollow tube and an inner calibrated floating rod isinserted into a sample of freshly mixed concrete to a presetlevel and held in place by a collar floater. A portion of theconcrete is allowed to flow into the hollow tube through itsperforations for a period of 40

8、s. The inner floating rod is thenlowered onto the concrete surface that has penetrated thehollow tube. The height of the concrete in the hollow tube isread from the scale on the upper portion of the floating rodprotruding from the top of the hollow tube. With increasingfluidity of the concrete a hig

9、her flow reading is obtained on ascale from zero to one hundred divisions.4. Significance and Use4.1 This test method permits a rapid assessment of the flowand consistency of freshly mixed concrete (see Note 1).4.2 This test method also provides information on thechange in flow and consistency with

10、time of concrete contain-ing superplasticizer admixtures.4.3 This test method can be used to measure the uniformitycharacteristics of flow and consistency of freshly mixedconcrete and its change with time.NOTE 1This test method may not be appropriate for use in evaluatinggap-graded aggregate concret

11、e.5. Apparatus5.1 Details of the apparatus are shown in Fig. 1. Theapparatus consists of (1) measuring rod, (2) scale datum, (3)hollow tube with round holes and longitudinal slots, (4)holding pin, (5) collar floater, and (6) tube point.5.2 Measuring rod is a hollow tube, 13 mm in outsidediameter, 33

12、6 mm long with a wall thickness of 1.5 mm and itis capped at both ends with a cap 15 mm in outside diameter.A scale datum is 45 mm in outside diameter and 25 mm wideand fabricated to fit hollow tube and accommodate measuringrod. Hollow tube has an outside diameter of 33 mm, and it is310 mm long with

13、 a wall thickness of 4 mm and has 16 roundholes, 9.4 mm in diameter, and 4 longitudinal slots, 9.4 mmwide by 50 mm long, which are distributed around thecircumference of the tube as shown in Fig. 1. A pin which is arivet, 3.2 mm in diameter, protrudes 3.2 mm inside tube. Collarfloater, made of a pla

14、te 5 mm thick, has an outside diameter of90 mm and inside diameter of 33 mm, is connected to hollowtube. Tube point is machined from a rod stock and fashionedinto a conical shape. It is secured to the bottom end of hollowtube, and it is used to facilitate the insertion of the assemblyinto the fresh

15、concrete. All individual dimensions shall have a1This 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 June 1, 2004. Published June 2004. Originally

16、approved in 1997. Last previous edition approved in 1997 as C 136297(2002).2Section on Safety Precautions, Manual of Aggregate and Concrete Testing,Annual Book of ASTM Standards, Vol 04.023For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at service

17、astm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.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

18、 States.tolerance of 61 % of their value. Make all parts of theapparatus of non-corrosive materials that are not affected bychemicals found in the fresh concrete.6. Sampling6.1 Determine the flow either as the concrete is placed in theforms prior to any manipulation or in a suitable container suchas

19、 a can, a hopper, a pail, or a wheelbarrow. The sample ofconcrete from which determination of flow is made shall berepresentative of the entire batch. Obtain the sample inaccordance with the requirements of Practice C 172.7. Procedure7.1 Bring the surface of the concrete to a smooth and levelconditi

20、on. Use a small wood float or screed, but work thesurface as little as possible to avoid formation of mortar layers.The minimum depth of concrete at testing shall be 175 mm,and the distance from the tube to the nearest edge of the levelsurface of the concrete on which the flow or consistency is tobe

21、 determined shall be a minimum of 75 mm. During the flowmeasurement protect the concrete against vibration, jarring, oragitation. Wet the apparatus, and shake off all excess water.Raise the measuring rod, and let it rest on the pin inside theapparatus. Insert the apparatus slowly and vertically down

22、warduntil the collar floater rests at the surface of the concrete. Donot rotate the apparatus while inserting it into the concrete.After 40 s of complete insertion lower the measuring rodslowly until it rests on the surface of the concrete that enteredinto the hollow tube. Read and record the level

23、of themeasuring rod to the nearest division in percent on the scalewhich represents the flow of the concrete.8. Report8.1 Record the flow in terms of the number of divisions of1 % on the scale; if more than one test reading is taken on thesame concrete, report the average to the nearest division inp

24、ercent.9. Precision and Bias49.1 PrecisionBased on data from 150 tests, with a flow of10 to 90 % the pooled standard deviation is 8 %4for a singleoperator using the same test device. Therefore, the range of twotests on the same material should not exceed 23 %.44Supporting data have been filed at AST

25、M International Headquarters and maybe obtained by requesting Research Report RR: C09-1011.FIG. 1 Apparatus for Flow TestC1362042NOTE 2These numbers represent, respectively, the (1 s %) and(d2s %) limits as defined in Practice C 670.9.2 BiasThis test method has no bias because the valuesdetermined c

26、an be defined only in terms of this test method.10. Keywords10.1 concrete; consistency; flow; fluidity; fresh concrete;uniformitySUMMARY OF CHANGESCommittee C09 has identified the location of selected changes to this test method since the last issue,C 1362 97(2002), that may impact the use of this t

27、est method. (Approved June 1, 2004)(1) Editorial correction to the title.(2) New section 1.4 concerning notes.(3) Renumbered section 1.5 with addition of safety caveat.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin t

28、his 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 time by the responsible technical committee and must

29、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 receive careful consideration at a meeting of there

30、sponsible 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 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).C1362043