1、Designation: C1621/C1621M 09bC1621/C1621M 14Standard Test Method forPassing Ability of Self-Consolidating Concrete by J-Ring1This standard is issued under the fixed designation C1621/C1621M; the number immediately following the designation indicates theyear of original adoption or, in the case of re
2、vision, the 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 passing ability of self-consolidating concrete (SCC)
3、 by using the J-Ring incombination with a mold.1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in eachsystem may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from
4、thetwo systems may result in non-conformance with the standard.1.3 The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes(excluding those in tables and figures) shall not be considered as requirements of the standard.1.4 This standard do
5、es not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use. (Warning(WarningFresh hydraulic ceme
6、ntitious mixtures are caustic and may cause chemical burns toskin and tissue upon prolonged exposure.Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns toskin and tissue upon prolonged exposure.2)2. Referenced Documents2.1 ASTM Standards:3C125 Terminology Relating to Conc
7、rete and Concrete AggregatesC143/C143M Test Method for Slump of Hydraulic-Cement ConcreteC172 Practice for Sampling Freshly Mixed ConcreteC173/C173M Test Method for Air Content of Freshly Mixed Concrete by the Volumetric MethodC1611/C1611M Test Method for Slump Flow of Self-Consolidating Concrete3.
8、Terminology3.1 Definitions:3.1.1 For definitions of terms used in this test method, refer to Terminology C125.3.2 Definitions of Terms Specific to This Standard:3.2.1 halo, nan observed cement paste or mortar ring that has clearly separated from the coarse aggregate, around the outsidecircumference
9、of concrete after flowing from the mold.3.2.2 J-ring, nan apparatus consisting of a rigid ring supported on sixteen 16 mm 58 in. diameter rods equally spaced ona 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 con
10、crete using the J-Ring in combination with a mold.3.2.4 passing ability, nthe ability of self-consolidating concrete to flow under its own weight (without vibration) and fillcompletely all spaces within intricate formwork, containing obstacles, such as reinforcement.4. Summary of Test Method4.1 A sa
11、mple of freshly mixed concrete is placed in a mold, either in the upright or inverted position, that is concentric withthe J-Ring (Fig. 2). The concrete is placed in one lift without tamping or vibration. The mold is raised, and the concrete is allowed1 This test method is under the jurisdiction of
12、ASTM Committee C09 on Concrete and Concrete Aggregates and is the direct responsibility of Subcommittee C09.47 onSelf-Consolidating Concrete.Current edition approved July 1, 2009April 1, 2014. Published August 2009May 2014. Originally approved in 2006. Last previous edition approved in 2009 asC1621/
13、C1621M 09a.C1621/C1621M 09b. DOI: 10.1520/C1621_C1621M-09B.10.1520/C1621_C1621M-14.2 Section on Safety Precautions, Manual of Aggregate and Concrete Testing, Annual Book of ASTM Standards, Vol.Vol 04.02.3 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Serv
14、ice at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previou
15、s version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Change
16、s section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1to spread through the J-Ring (Fig. 3). After spreading ceases, two diameters of the concrete mass are measured in approximatelyorthogonal dir
17、ections. J-Ring flow is the average of the two diameters. The test is repeated without the J-Ring to obtain the slumpflow. The difference between the slump flow and J-Ring flow is an indicator of the passing ability of the concrete.5. Significance and Use5.1 This test method provides a procedure to
18、determine the passing ability of self-consolidating concrete. This test method isapplicable for laboratory use in comparing the passing ability of different concrete mixtures. It is also applicable in the field as aquality control test.5.2 The difference between the slump flow and J-Ring flow is an
19、indication of the passing ability of the concrete. A differenceless than 25 mm 1 in. indicates good passing ability and a difference greater than 50 mm 2 in. indicates poor passing ability.The orientation of the mold for the J-Ring test and for the slump flow test without the J-Ring shall be the sam
20、e.5.3 This test method is limited to self-consolidating concrete with nominal maximum size of aggregate of up to 25 mm 1 in.6. Apparatus6.1 J-RingThe apparatus shall consist of a steel (or equivalent nonabsorbent, rigid material) ring measuring 300 mm 12 in.in diameter at the center of the ring and
21、25 mm 1 in. in thickness, and sixteen 16 mm 58 in. diameter smooth steel rods spacedevenly around the ring measuring 100 mm 4 in. in length (see Fig. 1).6.2 MoldThe mold used in this test method shall conform to that described in Test Method C143/C143M, except that the footpieces are removed when th
22、e test is performed with the mold in the upright position (Procedure A).FIG. 1 J-Ring ApparatusC1621/C1621M 1426.3 Base PlateA nonabsorbent, smooth, rigid plate having a minimum diameter of 915 mm 36 in.NOTE 1Field experience has shown that base plates made from sealed or laminated plywood, rigid pl
23、astic, or steel are suitable for performing thistest.6.4 Strike-off BarAs described in Test Method C173/C173M.6.5 Measuring DeviceA ruler, metal roll-up measuring tape, or similar rigid or semi-rigid measuring instrument marked inincrements of 5 mm 14 in. or less.6.6 Sample ReceptacleApan or wheelba
24、rrow that is water-tight, has a nonabsorbent surface, and is large enough to allow bothremixing of the entire sample and retain a volume of concrete sufficient to fill the mold.6.7 Pouring Vessel for SCCA water-tight container having a volume such that concrete is not spilled during placement in the
25、mold.NOTE 2A pouring vessel with a pouring lip is useful in reducing the probability of concrete spilling while filling the mold.6.8 Other ToolsItems such as shovels and scoops capable of remixing the concrete in the sample receptacle, filling the pouringvessel, or both.7. Sample7.1 The Obtain a sam
26、ple of concrete from which test specimens arefreshly-mixed self-consolidating concrete in accordance withPractice C172 made shall be representative of the entire batch. It shall be obtained in accordance with Practice and place it in thesample receptacle. C172.FIG. 2 J-Ring Setup with Inverted Mold
27、Filled with ConcreteFIG. 3 J-Ring FlowC1621/C1621M 1438. Procedure8.1 Perform thethis test on a flat, level, nonabsorbent work surface such as a concrete floor or a base plate. Use thea base platein conditions where a flat, level surface is not available, such as on a construction site. When the bas
28、e plate is used, position andshim the base plate so that it is fully supported, flat, and level. Pre-moisten the work surface or base-plate with a damp towel, rag,or sponge. Rest the J-Ring on the supported. Dampen the work surface, removing any standing water. Do not subject the worksurface or at t
29、he center of the base plate.mold to vibration or disturbance.8.1.1 When performing the slump flow test for a given study or project, do not change the base plate type for the duration ofthe study or project.8.1.2 Place the J-Ring on the work surface or at the center of the base plate.8.2 Remixing of
30、 Sample. Remix the sample, obtained in accordance with 7.1, in the sample receptacle using a shovel or scoopso that the concrete is homogeneous.8.3 Filling the MoldFill the mold by following either Procedure A or Procedure B.8.3.1 Filling Procedure A (Upright Mold)Dampen the interior of the mold and
31、 place it on the work surface or base plate withthe larger opening facing down and concentric with the JRing.J-Ring. Hold the mold firmly in place during filling. Fill the moldin a continuous manner. Overfill the mold slightly above its top.8.3.2 Filling Procedure B (Inverted Mold)Dampen the interio
32、r of the mold and place it on the work surface or base plate withthe smaller opening facing down and concentric with the JRing. SupportJ-Ring (see Note 3the mold during filling. Fill the moldin a continuous manner. Overfill the mold slightly above its top.).NOTE 3As a precaution, when filling the mo
33、ld in the inverted position, the mold may be supported to prevent accidental movement or tipping.Experienced users of this test method have found that it is not necessary to support the mold.8.3.3 Fill Pouring VesselImmediately fill the pouring vessel with a portion of SCC from the sample receptacle
34、, either bypassing the pouring vessel through the concrete or by scooping concrete into the vessel.8.3.4 Filling ProcedureImmediately fill the mold with SCC by tilting the pouring vessel. Position the lowest point on the rimof the pouring vessel no more than 125 mm 5 in. above the top of the mold. E
35、nsure an even distribution of concrete, withoutrodding the concrete or tapping the sides of the mold, while filling the mold.8.3.5 If necessary, repeat the procedures in 8.3.3 and 8.3.4 until the mold is filled slightly above its rim.NOTE 2As a precaution, when filling the mold in the inverted posit
36、ion, the mold may be supported to prevent accidental movement or tipping.Experienced users of this test method have found that it is not necessary to support the mold.NOTE 3Filling the mold with concrete by using multiple scoops or by pouring from a bucket or similar container has been found to be a
37、cceptable.8.4 Strike off the surface of the concrete level with the top of the mold by a sawing motion of the strike-off bar. Remove concretefrom the area surrounding the base of the mold to preclude interference with the movement of the flowing concrete. Remove themold from the concrete by raising
38、it vertically. Raise the mold a distance of 225675 mm 963 in. in 361 s by a steady upwardlift with no lateral or torsional motion. Complete the entire test from the start of filling through removal of the mold withoutinterruption within an elapsed time of 2 12 min.8.5 Wait for the concrete to stop f
39、lowing and then measure the largest diameter (j1) of the resulting circular spread of concrete.When a halo is observed in the resulting circular spread of concrete, it shall be included as part of the diameter of the concrete.Measure a second diameter (j2) of the circular spread at an angle approxim
40、ately perpendicular to the first measured diameter (j1).Measure the diameters to the nearest 5 mm 14 in. Determine the J-Ring flow in accordance with Section 9.8.6 If the measurement of the two diameters differs by more than 50 mm 2 in., the test is invalid and shall be repeated.8.7 Conduct a slump
41、flow test without the J-Ring in accordance with Test Method C1611/C1611M. Use the same fillingprocedure as used with the J-Ring. Complete the tests with and without the J-Ring within 6 min.9. Calculation9.1 Calculate J-Ring flow according to the following equation:J2Ring flow5j11j2!2 (1)where:where:
42、j1 = the largest diameter of the circular spread of the concrete from the J-Ring test, andj2 = the circular spread of the concrete at an angle approximately perpendicular to j1.9.2 Calculate the slump flow according to the following equation:Slump flow5d11d2!2 (2)C1621/C1621M 144where:where:d1 = the
43、 largest diameter of the circular spread of the concrete from the slump flow test, andd2 = the circular spread of the concrete at an angle approximately perpendicular to d1.9.3 Calculate the difference between slump flow and J-Ring flow to the nearest 10 mm 12 in. This number represents thepassing a
44、bility of 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 nearest 10 mm 12 in.11.3 Report the slump flow (without the J-Ring) to the nearest 10 mm 12 in.11.4 Report
45、 the passing ability as the difference between the slump flow and J-Ring flow to the nearest 10 mm 12 in. Identifythe blocking assessment.12. Precision and Bias12.1 PrecisionAn interlaboratory study of this test method has not been carried out. In a study involving two operators whoperformed three r
46、eplicate tests on 30 batches of the same concrete mixture during normal production at a precast plant, thewithin-test standard deviation (repeatability) for passing ability was 5.8 mm 0.23 in. The average passing ability in these testswas 20.5 mm 0.81 in. for slump-flow values ranging from about 480
47、 to 740 mm 19 to 29 in. Measurements were done in theinch-pound system and the SI values are conversion of the inch-pound values.12.2 BiasThe procedure used in this test method has no bias since passing ability based on the J-Ring flow is defined onlyin terms of this test method.13. Keywords13.1 hal
48、o; 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 standard since the last issue,issue (C1621/C1621M 09aC1621/C1621M 09b,) that may impact the use of this test meth
49、od. standard.(Approved JulyApril 1, 2009)2014.)(1) Reworded the Scope, Section 5, Section 6, and Section 8 to be in harmony with Test Method C1611/C1611M.(1) Added new 6.6, 6.7 with Note, and 6.8.(2) Revised 7.1.(3) Revised Section 8 .(4) Added new 8.2.(5) Removed old Note 3.Committee C09 has identified the location of selected changes to this test method since the last issue,C1621/C1621M 09, that may impact the use of this test method. (Approved June 1, 2009)(1) Revised Section
