1、Designation: C 1621/C 1621M 09Standard 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-Rin
3、g incombination with a slump cone mold. The test method islimited to concrete with nominal maximum size of aggregate ofup to 1 in 25 mm.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. Within the text, theSI units are shown in brackets. The value
4、s stated in eachsystem may not be exact equivalents; therefore, each systemshall be used independently of the other. Combining valuesfrom the two systems may result in non-conformance with thestandard.1.3 The text of this standard references notes that provideexplanatory material. These notes (exclu
5、ding those in tablesand figures) shall not be considered as requirements 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
6、 and determine the applica-bility of regulatory limitations prior 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 ConcreteAg
7、gregatesC 143/C 143M Test Method for Slump of Hydraulic-Cement 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
8、 Definitions:3.1.1 For definitions of terms used in this test 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 aft
9、er flowing from the slumpcone.3.2.2 J-ring, nan apparatus consisting of a rigid ringsupported on sixteen58 in. 16 mm diameter rods equallyspaced on a 12 in. 300 mm diameter circle 4 in. 100 mmabove a flat surface as shown in Fig. 1.3.2.3 J-ring flow, nthe distance of lateral flow of concreteusing th
10、e J-Ring in combination with a slump cone.3.2.4 passing ability, nthe ability 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 fr
11、eshly mixed concrete is placed in a slumpmold, either in the upright or inverted position, that isconcentric with the J-Ring (Fig. 2). The concrete is placed inone lift without tamping or vibration. The mold is raised, andthe concrete is allowed to spread through the J-Ring (Fig. 3).After spreading
12、ceases, two diameters of the concrete mass aremeasured in approximately orthogonal directions. J-Ring flowis the average of the two diameters. The test is repeated withoutthe J-Ring to obtain the slump flow. The difference between theslump flow and J-Ring flow is an indicator of the passingability o
13、f the concrete.5. Significance and Use5.1 This test method provides a procedure 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
14、 the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregates and is the direct responsibility of SubcommitteeC09.47 on Self-Consolidating Concrete.Current edition approved May 1, 2009. Published June 2009. Originallyapproved in 2006. Last previous edition approved in 2008 as C 1621/C 1
15、621M 08.2Section 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.org. For Annual Book of ASTMStandards volume information, re
16、fer 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 States.less than 1 in. 25 mm indicates good passing ability and
17、adifference greater than 2 in. 50 mm indicates poor passingability. The orientation of the slump cone for the J-Ring testand for the slump flow test without the J-Ring shall be thesame.5.2 This test method is applicable for laboratory use incomparing the passing ability of different concrete mixture
18、s. Itis also applicable in the field as a quality control test.6. Apparatus6.1 J-RingThe apparatus shall consist of a steel (orequivalent nonabsorbent, rigid material) ring measuring 12 in.300 mm in diameter at the center of the ring and 1 in. 25mm in thickness, and sixteen58 in. 16 mm diameter smoo
19、thsteel rods spaced evenly around the ring measuring 4 in. 100mm in length (see Fig. 1).6.2 MoldThe mold (slump cone) used in this test methodis as described in Test Method C 143/C 143M, except that thefoot pieces are removed when the test is performed with themold in the upright position (Procedure
20、 A).6.3 Base PlateA nonabsorbent, rigid plate having a diam-eter of at least 36 in. 915 mm.NOTE 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
21、.5 Measuring DeviceA ruler, metal roll-up measuringtape, or similar rigid or semi-rigid length measuring instrumentmarked in increments of14 in. 5 mm 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 acco
22、rdance with Practice C 172.FIG. 1 J-Ring ApparatusC 1621/C 1621M 0928. Procedure8.1 Perform the test on a flat, level, and nonabsorbentsurface such as a concrete floor or a base plate. Use the baseplate in conditions where a flat, level surface is not available,such as on a construction site. When t
23、he base plate is used,position and shim the base plate so that it is fully supported andlevel. 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 b
24、y following either Procedure A or Procedure B.8.2.1 Filling Procedure A (Upright Mold)Dampen themold, and place it on the surface or base plate with the largeropening facing down and concentric with the J-Ring. Hold themold firmly in place during filling. Fill the mold in one lift.Heap the concrete
25、above the top of the mold.8.2.2 Filling Procedure B (Inverted Mold)Dampen themold, and place it on the surface or base plate with the smalleropening facing down and concentric with the J-Ring. Supportthe mold and fill the mold in one lift. Heap the concrete abovethe top of the mold.8.3 Strike off th
26、e surface of the concrete 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 9 6 3 in. 230 6 75 mm in 3 6 1sbya steady vertical lift w
27、ith no lateral or 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 (d1) of the resulting circular flow ofconcrete. W
28、hen a halo is observed in the resulting circular flowof concrete, it shall be included as part of the diameter of theconcrete. Measure a second diameter (d2) of the circular flowat approximately perpendicular to the first measured diameter(d1). Measure the diameters to the nearest14 in. 5 mm.Determi
29、ne the J-Ring flow 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 Calc
30、ulate J-Ring flow according to the following equa-tion:J2Ring flow 5j11 j2!2(1)9.2 Calculate the slump flow according to the followingequation:Slump flow 5d11 d2!2(2)9.3 Calculate the difference between slump flow and J-Ringflow to the nearest12 in. 10 mm. This number represents thepassing ability o
31、f the concrete.10. Blocking Assessment10.1 Identify blocking assessment according to Table 1.11. Report11.1 Report the filling procedure (A or B) used.11.2 Report the J-Ring flow to the nearest12 in. 10 mm.11.3 Report the slump flow (without the J-Ring) to thenearest12 in. 10 mm.11.4 Report the pass
32、ing ability as the difference between theslump flow and J-Ring flow to the nearest12 in. 10 mm.Identify the blocking assessment.12. Precision and Bias12.1 PrecisionAn interlaboratory study of this testmethod has not been carried out. In a study involving twooperators who performed three replicate te
33、sts on 30 batches ofFIG. 2 J-Ring Setup with Inverted Mold Filled with ConcreteFIG. 3 J-Ring FlowTABLE 1 Blocking AssessmentDifference BetweenSlump Flow and J-Ring FlowBlocking Assessment0 to 1 in. 0 to 25 mm No visible blocking1 to 2 in. 25 to 50 mm Minimal to noticeable blocking2 in. 50 mm Noticea
34、ble to extreme blockingC 1621/C 1621M 093the same concrete mixture during normal production at aprecast plant, the within-test standard deviation (repeatability)for passing ability was 0.23 in. 5.8 mm. The average passingability in these tests was 0.81 in. 20.5 mm for slump-flowvalues ranging from a
35、bout 19 to 29 in. 480 to 740 mm.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 definedonly in terms of this test method.SUMMARY OF CH
36、ANGESCommittee C09 has identified the location of selected changes to 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 wit
37、h TestMethod C 1611/C 1611M.Committee C09 has identified the location 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
38、 the dimension table of Fig. 1.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 any such patent rights, and the riskof i
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41、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).C 1621/C 1621M 094
