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J Ring Apparatus

Product Code : EL-CTLE-10297

Quick Answer:

A J-Ring Apparatus is used to run the J-Ring test, which determines the passing ability, flow spread, and flow time of self-compacting concrete as it flows through the ring, either in the laboratory or as a field quality control test. The set includes a stainless steel J-Ring (narrow gap, ø18 mm x 16 smooth bars) conforming to EN 12350-8, a 900x900x3 mm stainless steel base plate with engraved 200 mm and 500 mm positioning circles, a corrosion-protected sheet steel slump cone (100 mm top, 200 mm base, 300 mm height), and a steel weighted collar to stabilize the cone during J-Ring or slump flow testing.

The J-ring test can be used to determine the passing ability of self-consolidating concrete, and it is applicable for laboratory use in testing different concrete mixtures for passing ability, or it can be used in the field as a quality control test. It is typical to also perform a slump flow test with the J-ring test: this test is similar to the J-ring test, except the J-ring is not used, and the difference between the results of the two tests provides an indicator of the passing ability of the concrete. Designed for durability, the J-ring set includes a slump cone, a J-ring with smooth or rebar rods, and a steel base plate with engraved positioning rings.

J Ring Apparatus

The J-Ring test is used for determining the passing ability, the flow spread and the flow time of self compacting concrete as the concrete flows through the J Ring apparatus. The J-Ring narrow gap, with ø18 mm x 16 smooth bars, is manufactured from stainless steel, and the Base plate is 900x900x3 mm square, made of stainless steel with engraved circles of 200 mm and 500 mm diameter conforming to EN 12350-8. The Slump Cone is made from sheet steel protected against corrosion, with diameters of 100 mm at the top, 200 mm at the base, and a height of 300 mm, and the Steel weighted collar is used to stabilize the slump cone on J-Ring or slump flow tests. The minimum apparatus for the J-Ring test is a J-Ring with narrow gap and a slump cone.

Standards: ASTM C1621, ASTM C1621M, ASTM C1611

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Last Updated: September 2026