Scope 1. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other. Referenced Documents 2. Terminology 3.
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Scope 1. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other. Referenced Documents 2. Terminology 3. Summary of Test Method 4. The concrete is placed in one lift without tamping or vibration.
The mold is raised, and the concrete is allowed to pass through J-Ring and subside Figure 3. The diameters of the concrete, in two directions approximately perpendicular to each other, are measured and averaged to obtain the J-Ring flow. The test is repeated without the J-Ring to obtain the slump flow. The difference between the slump flow and J-Ring flow is an indicator of the passing ability of the concrete.
Significance and Use 5. The difference between the slump flow and J-Ring flow is an indication of the passing ability of the concrete. Significance and Use. The difference between the slump flow and J-Ring flow is an passing ability. Dimension in mm A Figure 1 5.
It is also applicable in the field as a quality control test. A difference less than 1 in. Apparatus 6. Note 1: Field experience has shown that base plates made from sealed or laminated plywood, rigid plastic, or steel are suitable for performing this test.
Sample 7. Sample Sample sample of concrete from which test specimens are made shall be representative of the entire batch. It shall7.
Procedure 8. Use the base Perform theconditions plate in test on a flat, wherelevel, andlevel a flat, nonabsorbent surface issurface such assuch not available, a concrete as on afloor or a base construction plate. Use site. When the base the on plate basea plate in conditions is used, where position a flat, level and shim base surface the base is plate not available, so that it such as on a is fully 8.
Position and shim the base supportedplateconstruction and level. Pre-moisten Whenthe the base surface orplate is used, base-plate position and shim with a dampbase-plate the base towel, rag, with plate or sponge. Pre-moisten surface or base-plate with a damp towel,a damp rag, ortowel, sponge. Rest the J-Ring on the surface or at the center of the base plate.
Rest on the the J-Ring surface at center or at the the center of theofbase the plate. Fill the mold in one lift.
Heap the concrete above the top of the base plate with the larger opening facing down and concentric with the J-Ring. Support the mold and fill the mold in one lift Note 2. Heap the concrete above the mold. Heap the concrete above the top of 8. Mold —Dampen the mold, and place it on the surface or Inverted base plate 8.
Heapopening facing the concrete down and abovefound concentric with the the toptoofbetheacceptable. Support the from mold bucket and fill or similar the mold in container one lift. Remove concrete from the area surrounding the the movement of the flowing concrete.
Raise the mold a distance 1 s by a steady vertical lift with no lateral or torsional motion. When a halo is observed in the resulting circular flow of concrete, it shall be included as part of the diameter of the concrete. Measure a second diameter d2 of the circular flow at approximately perpendicular to the first measured diameter d1. Determine the J-Ring flow in accordance with Section 9 of this test method. Use the same filling procedure as used with the J-Ring. Calculation 9.
Blocking Assessment Blocking Assessment Table 1. Report Identify the blocking assessment. Procedure Element Yes No 1. The tester has a copy of the current procedure on hand? Molds and base plate dampened and base plate is flat, level and fully supported? Mold is centered in J-Ring and centered on base plate?
Mold filled completely in one lift slightly overfilled? Mold struck off level with top opening? After flow has stabilized, measure largest diameter including halo?
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237R-07 Self-Consolidating Concrete (Reapproved 2019)
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