J-Ring Test For Self-Consolidating Concrete Test Set
The J-ring test can be used to determine the passing ability of self compacting concrete and self-consolidating concrete. It can be used in the lab to test different concrete mixes for passing ability or in the field as a quality control test. It is common to also do a slump flow test with the J-ring test. This test is similar to the J-ring except the J-ring is not used. The difference between the two tests will give you an idea of the passing ability of the concrete.
Kit includes Slump Cone, J-Ring, Steel Base Plate, Acrylic Strike Off Bar
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Meets ASTM C1621
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Durable
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Smooth rebar rods
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Engraved positioning rings on steel base plate
Introduction
In the concrete construction world, quality and performance of materials is key. One of the tests used to evaluate self-consolidating concrete (SCC) is the J-Ring Test. This test is used to determine the passing ability of SCC, to see if it can flow under its own weight and fill complex forms without vibration. By using the J-Ring Test with the Slump Flow Test, construction professionals can evaluate both the flowability and passing ability of self consolidating concrete scc and get more reliable and durable concrete structures.
What is J-Ring Test?
The J-Ring Test is a standard test to determine passing ability of self-consolidating concrete (SCC). This is important in the construction industry as it ensures the concrete can flow under its own weight and fill complex forms without vibration. The J-Ring Test is usually done with the Slump Flow Test to evaluate the flowability and passing ability of SCC. By comparing the two tests, you will get a complete picture of the concrete’s performance. The J-Ring Test is standardized by ASTM C1611 and C1621 so it’s a proven and widely used method in the industry.
Components and Accessories
The J-Ring Test Set includes:
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J-Ring Assembly: A stainless steel crown with 16 bars, 18mm diameter, to simulate congested rebar.
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Modified Slump Cone: A steel cone to measure the flow of concrete to ensure consistency of the test.
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HDPE Strike-Off Bar: A high-density polyethylene bar to strike off the concrete for a smooth surface.
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Plastic Base Plate: A durable plastic plate with engraved circles to provide a stable and level surface for the quality control test.
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Smooth Rods: Smooth rods that are part of the J-Ring assembly to minimize the resistance of the concrete flow.
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Rebar Rods: Optional rebar rods to simulate more complex rebar scenario.
How to Test
To perform the J-Ring Test:
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Test Site Preparation: Make sure the base plate is level and the J-Ring is aligned properly.
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Fill the Modified Slump Cone with Concrete: Fill the cone with fresh concrete in one lift, no air pockets.
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Lift the Cone: Lift the cone straight up, let the concrete flow through the J-Ring and spread on the base plate.
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Measure the Flow Diameters: Measure the diameter of the circular flow of concrete, note any obstruction caused by the J-Ring.
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Repeat the Test: Test again without the J-Ring and measure the flow diameters to compare.
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Calculate the Passing Ability: Calculate and determine passing ability by subtracting the flow diameter without J-Ring from the flow diameter with J-Ring. This will show the concrete’s ability to pass through congested areas.
By following these steps you will get the accurate passing ability of self-consolidating concrete and different concrete mixtures to meet the standard.
Standard(s):
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ASTM C1611/1611M
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ASTM C1621/1621M
