ASTM C1621 C1621M-2009a Standard Test Method for Passing Ability of Self-Consolidating Concrete by J-Ring.pdf

1、Designation: C 1621/C 1621M 09aStandard Test Method forPassing Ability of Self-Consolidating Concrete by J-Ring1This standard is issued under the fixed designation C 1621/C 1621M; the number immediately following the designation indicates theyear of original adoption or, in the case of revision, the

2、 year 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.1. Scope*1.1 This test method covers determination of the passingability of self-consolidating concrete by using the J-Ri

3、ng incombination with a mold. The test method is limited toconcrete with nominal maximum size of aggregate of up to 25mm 1 in.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exact equivalents; therefore

4、, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.1.3 The text of this standard references notes that provideexplanatory material. These notes (excluding those in tablesand figures) shall not be considered as re

5、quirements of thestandard.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 regulatory limitations pr

6、ior to use. (WarningFreshhydraulic cementitious mixtures are caustic and may causechemical burns to skin and tissue upon prolonged exposure.)22. Referenced Documents2.1 ASTM Standards:3C 125 Terminology Relating to Concrete and ConcreteAggregatesC 143/C 143M Test Method for Slump of Hydraulic-Cement

7、 ConcreteC 172 Practice for Sampling Freshly Mixed ConcreteC 173/C 173M Test Method for Air Content of FreshlyMixed Concrete by the Volumetric MethodC 1611/C 1611M Test Method for Slump Flow of Self-Consolidating Concrete3. Terminology3.1 Definitions:3.1.1 For definitions of terms used in this test

8、method, referto Terminology C 125.3.2 Definitions of Terms Specific to This Standard:3.2.1 halo, nan observed cement paste or mortar ring thathas clearly separated from the coarse aggregate, around theoutside circumference of concrete after flowing from the mold.3.2.2 J-ring, nan apparatus consistin

9、g of a rigid ringsupported on sixteen 16 mm 58 in. diameter rods equallyspaced on a 300 mm 12 in. diameter circle 100 mm 4 in.above a flat surface as shown in Fig. 1.3.2.3 J-ring flow, nthe distance of lateral flow of concreteusing the J-Ring in combination with a mold.3.2.4 passing ability, nthe ab

10、ility of self-consolidatingconcrete to flow under its own weight (without vibration) andfill completely all spaces within intricate formwork, containingobstacles, such as reinforcement.4. Summary of Test Method4.1 A sample of freshly mixed concrete is placed in a mold,either in the upright or invert

11、ed position, that is concentric withthe J-Ring (Fig. 2). The concrete is placed in one lift withouttamping or vibration. The mold is raised, and the concrete isallowed to spread through the J-Ring (Fig. 3). After spreadingceases, two diameters of the concrete mass are measured inapproximately orthog

12、onal directions. J-Ring flow is the aver-age of the two diameters. The test is repeated without theJ-Ring to obtain the slump flow. The difference between theslump flow and J-Ring flow is an indicator of the passingability of the concrete.5. Significance and Use5.1 This test method provides a proced

13、ure to determine thepassing ability of self-consolidating concrete mixtures. Thedifference between the slump flow and J-Ring flow is anindication of the passing ability of the concrete. A difference1This test method is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregates a

14、nd is the direct responsibility of SubcommitteeC09.47 on Self-Consolidating Concrete.Current edition approved June 1, 2009. Published July 2009. Originally approvedin 2006. Last previous edition approved in 2009 as C 1621/C 1621M 09.2Section on Safety Precautions, Manual of Aggregate and Concrete Te

15、sting,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.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1*A Summary o

16、f 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.less than 25 mm 1 in. indicates good passing ability and adifference greater than 50 mm 2 in. indicates poor passingability. The ori

17、entation of the mold for the J-Ring test and forthe slump flow test without the J-Ring shall be the same.5.2 This test method is applicable for laboratory use incomparing the passing ability of different concrete mixtures. Itis also applicable in the field as a quality control test.6. Apparatus6.1 J

18、-RingThe apparatus shall consist of a steel (orequivalent nonabsorbent, rigid material) ring measuring 300mm 12 in. in diameter at the center of the ring and 25 mm 1in. in thickness, and sixteen 16 mm 58 in. diameter smoothsteel rods spaced evenly around the ring measuring 100 mm 4in. in length (see

19、 Fig. 1).6.2 MoldThe mold used in this test method is as describedin Test Method C 143/C 143M, except that the foot pieces areremoved when the test is performed with the mold in theupright position (Procedure A).6.3 Base PlateA nonabsorbent, rigid plate having a diam-eter of at least 915 mm 36 in.NO

20、TE 1Field experience has shown that base plates made from sealedor laminated plywood, rigid plastic, or steel are suitable for performingthis test.6.4 Strike Off BarAs described in Test Method C 173/C 173M.6.5 Measuring DeviceA ruler, metal roll-up measuringtape, or similar rigid or semi-rigid lengt

21、h measuring instrumentmarked in increments of 5 mm 14 in. or less.7. Sample7.1 The sample of concrete from which test specimens aremade shall be representative of the entire batch. It shall beobtained in accordance with Practice C 172.8. Procedure8.1 Perform the test on a flat, level, and nonabsorbe

22、ntsurface such as a concrete floor or a base plate. Use the baseFIG. 1 J-Ring ApparatusC 1621/C 1621M 09a2plate in conditions where a flat, level surface is not available,such as on a construction site. When the base plate is used,position and shim the base plate so that it is fully supported andlev

23、el. Pre-moisten the surface or base-plate with a damp towel,rag, or sponge. Rest the J-Ring on the surface or at the centerof the base plate.8.2 Filling the MoldThe operator has the option of fillingthe mold by following either Procedure A or Procedure B.8.2.1 Filling Procedure A (Upright Mold)Dampe

24、n themold and place it on the work surface or base plate with thelarger opening facing down and concentric with the JRing.Hold the mold firmly in place during filling. Fill the mold in acontinuous manner. Overfill the mold slightly above its top.8.2.2 Filling Procedure B (Inverted Mold)Dampen themol

25、d and place it on the work surface or base plate with thesmaller opening facing down and concentric with the JRing.Fill the mold in a continuous manner. Overfill the mold slightlyabove its top.NOTE 2As a precaution, when filling the mold in the invertedposition, the mold may be supported to prevent

26、accidental movement ortipping. Experienced users of this test method have found that it is notnecessary to support the mold.NOTE 3Filling the mold with concrete by using multiple scoops or bypouring from a bucket or similar container has been found to beacceptable.8.3 Strike off the surface of the c

27、oncrete level with the topof the mold by a sawing motion of the strike off bar. Removeconcrete from the area surrounding the mold to precludeinterference with the movement of the flowing concrete. Raisethe mold a distance of 230 6 75 mm 9 6 3 in. in 3 6 1sbya steady vertical lift with no lateral or

28、torsional motion.Complete the entire procedure from start of the filling throughremoval of the mold without interruption within an elapsedtime of 212 min.8.4 Wait for the concrete to stop flowing and then measurethe largest diameter (j1) of the resulting circular flow ofconcrete. When a halo is obse

29、rved in the resulting circular flowof concrete, it shall be included as part of the diameter of theconcrete. Measure a second diameter (j2) of the circular flow atapproximately perpendicular to the first measured diameter(j1). Measure the diameters to the nearest 5 mm 14 in.Determine the J-Ring flow

30、 in accordance with Section 9 of thistest method.8.5 Conduct a slump flow test without the J-Ring in accor-dance with Test Method C 1611/C 1611M. Use the same fillingprocedure as used with the J-Ring. Complete the tests with andwithout the J-Ring within 6 min.9. Calculation9.1 Calculate J-Ring flow

31、according to the following equa-tion:J2Ring flow 5j11 j2!2(1)where:j1= the largest diameter of the circular spread of theconcrete from the J-Ring test, andj2= the circular spread of the concrete at an angle approxi-mately perpendicular to j1.9.2 Calculate the slump flow according to the followingequ

32、ation:Slump flow 5d11 d2!2(2)where:d1= the largest diameter of the circular spread of theconcrete from the slump flow test, andd2= the circular spread of the concrete at an angle approxi-mately perpendicular to d1.9.3 Calculate the difference between slump flow and J-Ringflow to the nearest 10 mm 12

33、 in. This number represents thepassing ability of the concrete.10. Blocking Assessment10.1 Identify blocking assessment according to Table 1.FIG. 2 J-Ring Setup with Inverted Mold Filled with ConcreteFIG. 3 J-Ring FlowTABLE 1 Blocking AssessmentDifference BetweenSlump Flow and J-Ring FlowBlocking As

34、sessment0 to 25 mm 0 to 1 in. No visible blocking25 to 50 mm 1 to 2 in. Minimal to noticeable blocking50 mm 2 in. Noticeable to extreme blockingC 1621/C 1621M 09a311. Report11.1 Report the filling procedure (A or B) used.11.2 Report the J-Ring flow to the nearest 10 mm 12 in.11.3 Report the slump fl

35、ow (without the J-Ring) to thenearest 10 mm 12 in.11.4 Report the passing ability as the difference between theslump flow and J-Ring flow to the nearest 10 mm 12 in.Identify the blocking assessment.12. Precision and Bias12.1 PrecisionAn interlaboratory study of this testmethod has not been carried o

36、ut. In a study involving twooperators who performed three replicate tests on 30 batches ofthe same concrete mixture during normal production at aprecast plant, the within-test standard deviation (repeatability)for passing ability was 5.8 mm 0.23 in. The average passingability in these tests was 20.5

37、 mm 0.81 in. for slump-flowvalues ranging from about 480 to 740 mm 19 to 29 in.Measurements were done in the inch-pound system and the SIvalues are conversion of the inch-pound values.12.2 BiasThe procedure used in this test method has nobias since passing ability based on the J-Ring flow is defined

38、only in terms of this test method.13. Keywords13.1 halo; j-ring; j-ring flow; passing ability self-consolidating concrete; slump flow; spreadSUMMARY OF CHANGESCommittee C09 has identified the location of selected changes to this test method since the last issue,C 1621/C 1621M 09, that may impact the

39、 use of this test method. (Approved June 1, 2009)(1) Revised Section 8. Added new Notes 2 and 3 andrenumbered subsequent notes.(2) Revised Section 9 to be in harmony with Test MethodC 1611/C 1611M and to comply withASTMs Form and Style.Committee C09 has identified the location of selected changes to

40、 this test method since the last issue,C 1621/C 1621M 08, that may impact the use of this test method. (Approved May 1, 2009)(1) Added a noun designation to the terms in Section 3.(2) Revised 4.1 and Section 11 to be in harmony with TestMethod C 1611/C 1611M.Committee C09 has identified the location

41、 of selected changes to this test method since the last issue,C 1621/C 1621M 06, that may impact the use of this test method. (Approved June 1, 2008)(1) Revised 1.1 to clarify the scope of this test method. (2) Corrected a value in the dimension table of Fig. 1.ASTM International takes no position r

42、especting 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 any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.Thi

43、s 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 invited either for revision of this standard or for additional standardsand should be addressed to ASTM Inte

44、rnational 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 received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown

45、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).C 1621/C 1621M 09a4