ASTM C1621/C1621M-17(2023)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: C1621/C1621M − 17 (Reapproved 2023)
Standard Test Method for
Passing Ability of Self-Consolidating Concrete by J-Ring
This standard is issued under the fixed designation C1621/C1621M; the number immediately following the designation indicates the
year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last
reapproval. A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* C125 Terminology Relating to Concrete and Concrete Ag-
gregates
1.1 This test method covers determination of the passing
C143/C143M Test Method for Slump of Hydraulic-Cement
ability of self-consolidating concrete (SCC) by using the
Concrete
J-Ring in combination with a mold.
C172 Practice for Sampling Freshly Mixed Concrete
1.2 The values stated in either SI units or inch-pound units
C173/C173M Test Method for Air Content of Freshly Mixed
are to be regarded separately as standard. The values stated in
Concrete by the Volumetric Method
each system may not be exact equivalents; therefore, each
C1611/C1611M Test Method for Slump Flow of Self-
system shall be used independently of the other. Combining
Consolidating Concrete
values from the two systems may result in non-conformance
C1758/C1758M Practice for Fabricating Test Specimens
with the standard.
with Self-Consolidating Concrete
1.3 The text of this standard references notes and footnotes
3. Terminology
that provide explanatory material. These notes and footnotes
(excluding those in tables and figures) shall not be considered 3.1 Definitions:
as requirements of the standard.
3.1.1 For definitions of terms used in this test method, refer
to Terminology C125.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
3.2 Definitions of Terms Specific to This Standard:
responsibility of the user of this standard to establish appro-
3.2.1 halo, n—an observed cement paste or mortar ring that
priate safety, health, and environmental practices and deter-
has clearly separated from the coarse aggregate, around the
mine the applicability of regulatory limitations prior to use.
outside circumference of concrete after flowing from the mold.
(Warning—Fresh hydraulic cementitious mixtures are caustic
3.2.2 J-ring, n—an apparatus consisting of a rigid ring
and may cause chemical burns to skin and tissue upon
supported on sixteen 16 mm [ ⁄8 in.] diameter rods equally
prolonged exposure. )
spaced on a 300 mm [12 in.] diameter circle 100 mm [4 in.]
1.5 This international standard was developed in accor-
above a flat surface as shown in Fig. 1.
dance with internationally recognized principles on standard-
3.2.3 J-ring flow, n—the distance of lateral flow of concrete
ization established in the Decision on Principles for the
using the J-Ring in combination with a mold.
Development of International Standards, Guides and Recom-
3.2.4 passing ability, n—the ability of self-consolidating
mendations issued by the World Trade Organization Technical
concrete to flow under its own weight (without vibration) and
Barriers to Trade (TBT) Committee.
fill completely all spaces within intricate formwork, containing
2. Referenced Documents obstacles, such as reinforcement.
2.1 ASTM Standards:
4. Summary of Test Method
4.1 A sample of freshly mixed concrete is placed in a mold,
either in the upright or inverted position, that is concentric with
This test method is under the jurisdiction of ASTM Committee C09 on
the J-Ring (Fig. 2). The concrete is placed in one lift without
Concrete and Concrete Aggregates and is the direct responsibility of Subcommittee
C09.47 on Self-Consolidating Concrete.
tamping or vibration. The mold is raised, and the concrete is
Current edition approved Oct. 1, 2023. Published October 2023. Originally
allowed to spread through the J-Ring (Fig. 3). After spreading
approved in 2006. Last previous edition approved in 2017 as C1621/C1621M – 17.
ceases, two diameters of the concrete mass are measured in
DOI: 10.1520/C1621_C1621M-17R23.
approximately orthogonal directions. J-Ring flow is the aver-
Section on Safety Precautions, Manual of Aggregate and Concrete Testing,
Annual Book of ASTM Standards, Vol 04.02.
age of the two diameters. The test is repeated without the
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
J-Ring to obtain the slump flow. The difference between the
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
slump flow and J-Ring flow is an indicator of the passing
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. ability of the concrete.
*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
C1621/C1621M − 17 (2023)
FIG. 1 J-Ring Apparatus
5. Significance and Use 6. Apparatus
5.1 This test method provides a procedure to determine the 6.1 J-Ring—The apparatus shall consist of a steel (or
passing ability of self-consolidating concrete. This test method equivalent nonabsorbent, rigid material) ring measuring
is applicable for laboratory use in comparing the passing ability
300 mm [12 in.] in diameter at the center of the ring and
of different concrete mixtures. It is also applicable in the field
25 mm [1 in.] in thickness, and sixteen 16 mm [ ⁄8 in.] diameter
as a quality control test.
smooth steel rods spaced evenly around the ring measuring 100
mm [4 in.] in length (see Fig. 1).
5.2 The difference between the slump flow and J-Ring flow
is an indication of the passing ability of the concrete. A
6.2 Mold—The mold used in this test method shall conform
difference less than 25 mm [1 in.] indicates good passing
to that described in Test Method C143/C143M, except that the
ability and a difference greater than 50 mm [2 in.] indicates
foot pieces are removed when the test is performed with the
poor passing ability. The orientation of the mold for the J-Ring
mold in the upright position (Procedure A).
test and for the slump flow test without the J-Ring shall be the
6.3 Base Plate—A nonabsorbent, smooth, rigid plate having
same.
a minimum diameter of 915 mm [36 in.].
5.3 This test method is limited to self-consolidating con-
NOTE 1—Field experience has shown that base plates made from sealed
crete with nominal maximum size of aggregate of up to 25 mm
or laminated plywood, rigid plastic, or steel are suitable for performing
[1 in.]. this test.
C1621/C1621M − 17 (2023)
on a construction site. When the base plate is used, position and
shim the base plate so that it is fully supported. Dampen the
work surface, removing any standing water. Do not subject the
work surface or 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 of
the 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 Sample. Remix the sample, obtained in
accordance with 7.1, in the sample receptacle using a shovel or
scoop so that the concrete
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