ASTM C1621 C1621M-2009b Standard Test Method for Passing Ability of Self-Consolidating Concrete by J-Ring《使用J-Ring法测定自密实混凝土的通过性的标准试验方法》.pdf

《ASTM C1621 C1621M-2009b Standard Test Method for Passing Ability of Self-Consolidating Concrete by J-Ring《使用J-Ring法测定自密实混凝土的通过性的标准试验方法》.pdf》由会员分享，可在线阅读，更多相关《ASTM C1621 C1621M-2009b Standard Test Method for Passing Ability of Self-Consolidating Concrete by J-Ring《使用J-Ring法测定自密实混凝土的通过性的标准试验方法》.pdf（5页珍藏版）》请在麦多课文档分享上搜索。

1、Designation: C 1621/C 1621M 09bStandard 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.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, eachsystem shall be used independently of the other. Combiningvalues from the two systems may r

4、esult in non-conformancewith the standard.1.3 The text of this standard references notes and footnotesthat provide explanatory material. These notes and footnotes(excluding those in tables and figures) shall not be consideredas requirements of the standard.1.4 This standard does not purport to addre

5、ss 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 prior to use. (WarningFreshhydraulic cementitious mixtures are caustic

6、and may causechemical burns to skin and tissue upon prolonged exposure.2)2. Referenced Documents2.1 ASTM Standards:3C 125 Terminology Relating to Concrete and ConcreteAggregatesC 143/C 143M Test Method for Slump of Hydraulic-Cement ConcreteC 172 Practice for Sampling Freshly Mixed ConcreteC 173/C 17

7、3M 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 method, referto Terminology C 125.3.2 Definitions of Terms Specific t

8、o 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 consisting of a rigid ringsupported on sixteen 16 mm 58 in. diameter rods equa

9、llyspaced 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 ability of self-consolidatingconcrete to flow under its own weight (wit

10、hout 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 inverted position, that is concentric withthe J-Ring (Fig. 2). The concrete

11、 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 orthogonal directions. J-Ring flow is the aver-age of the two diameters. Th

12、e 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 procedure to determine thepassing ability of self-consolidating concrete. T

13、his test methodis applicable for laboratory use in comparing the passing ability1This test method is under 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 July 1,

14、2009. Published August 2009. Originallyapproved in 2006. Last previous edition approved in 2009 as C 1621/C 1621M 09a.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.or

15、g, 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 of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C

16、700, West Conshohocken, PA 19428-2959, United States.of different concrete mixtures. It is also applicable in the fieldas a quality control test.5.2 The difference between the slump flow and J-Ring flowis an indication of the passing ability of the concrete. Adifference less than 25 mm 1 in. indicat

17、es good passingability and a difference greater than 50 mm 2 in. indicatespoor passing ability. The orientation of the mold for the J-Ringtest and for the slump flow test without the J-Ring shall be thesame.5.3 This test method is limited to self-consolidating con-crete with nominal maximum size of

18、aggregate of up to 25 mm1 in.6. Apparatus6.1 J-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

19、 the ring measuring 100 mm 4in. in length (see Fig. 1).6.2 MoldThe mold used in this test method shall conformto that 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 A).6.3 Base PlateAnonabsorben

20、t, smooth, rigid plate havinga minimum diameter of 915 mm 36 in.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.FIG. 1 J-Ring ApparatusC 162

21、1/C 1621M 09b26.5 Measuring DeviceA ruler, metal roll-up measuringtape, or similar rigid or semi-rigid 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 beobtaine

22、d in accordance with Practice C 172.8. Procedure8.1 Perform the test on a flat, level, nonabsorbent surfacesuch as a concrete floor or a base plate. Use the base plate inconditions where a flat, level surface is not available, such ason a construction site. When the base plate is used, position ands

23、him 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 work surface or at thecenter of the base plate.8.1.1 When performing the slump flow test for a given studyor project, do not change th

24、e base plate type for the duration ofthe study or project.8.2 Filling the MoldFill the mold by following eitherProcedure A or Procedure B.8.2.1 Filling Procedure A (Upright Mold)Dampen themold and place it on the work surface or base plate with thelarger opening facing down and concentric with the J

25、Ring.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 themold and place it on the work surface or base plate with thesmaller opening facing down and concentric with the JRing.Su

26、pport the mold during filling. Fill the mold in a continuousmanner. Overfill the mold slightly above its top.NOTE 2As a precaution, when filling the mold in the invertedposition, the mold may be supported to prevent accidental movement ortipping. Experienced users of this test method have found that

27、 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 concrete level with the topof the mold by a sawing motion of the strike-off bar. Remo

28、veconcrete from the area surrounding the base of the mold topreclude interference with the movement of the flowingconcrete. Remove the mold from the concrete by raising itvertically. Raise the mold a distance of 225 6 75 mm 9 6 3in. in 3 6 1 s by a steady upward lift with no lateral ortorsional moti

29、on. Complete the entire test from the start offilling through removal of the mold without interruption withinan elapsed time of 212 min.8.4 Wait for the concrete to stop flowing and then measurethe largest diameter (j1) of the resulting circular spread ofconcrete. When a halo is observed in the resu

30、lting circularspread of concrete, it shall be included as part of the diameterof the concrete. Measure a second diameter (j2) of the circularspread at an angle approximately perpendicular to the firstmeasured diameter (j1). Measure the diameters to the nearest 5mm 14 in. Determine the J-Ring flow in

31、 accordance withSection 9.8.5 If the measurement of the two diameters differs by morethan 50 mm 2 in., the test is invalid and shall be repeated.8.6 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. Com

32、plete the tests with andwithout the J-Ring within 6 min.9. Calculation9.1 Calculate J-Ring flow 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 ang

33、le approxi-mately perpendicular to j1.9.2 Calculate the slump flow according to the followingequation:Slump flow 5d11 d2!2(2)FIG. 2 J-Ring Setup with Inverted Mold Filled with ConcreteFIG. 3 J-Ring FlowC 1621/C 1621M 09b3where:d1= the largest diameter of the circular spread of theconcrete from the s

34、lump 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 in. This number represents thepassing ability of the concrete.10. Blocking Assessment10.1 Identify blocking

35、 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 thenearest 10 mm 12 in.11.4 Report the passing ability as the difference between theslump flow and J-Ri

36、ng 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 out. In a study involving twooperators who performed three replicate tests on 30 batches ofthe same concrete mixture during normal

37、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 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

38、 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.13. Keywords13.1 halo; j-ring; j-ring flow; passing ability self-consolidating concrete; slump f

39、low; spreadSUMMARY OF CHANGESCommittee C09 has identified the location of selected changes to this test method since the last issue,C 1621/C 1621M 09a, that may impact the use of this test method. (Approved July 1, 2009)(1) Reworded the Scope, Section 5, Section 6, and Section 8 tobe in harmony with

40、 Test Method 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 09, that may impact the use of this test method. (Approved June 1, 2009)(1) Revised Section 8. Added new Notes 2 and 3 andrenumbered subsequent notes.(2)

41、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 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) Ad

42、ded 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 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. (Appr

43、oved 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.TABLE 1 Blocking AssessmentDifference BetweenSlump Flow and J-Ring FlowBlocking Assessment0 to 25 mm 0 to 1 in. No visible blocking25 to 50 mm 1 to 2 in. Minimal to noti

44、ceable blocking50 mm 2 in. Noticeable to extreme blockingC 1621/C 1621M 09b4ASTM 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 validit

45、y 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 be reviewed every five years andif not revised, either reapproved or withdrawn. Your comment

46、s 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 theresponsible technical committee, which you may attend. If you feel that your comments have not

47、 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).C 1621/C 1621M 09b5