What Is Self Compact Concrete?

List of Test Methods for Workability Properties of Self Compacting Concrete (SCC).

• Slump flow by Abrams cone.
• T50 cm Slump flow
• J-ring
• V-funnel
• V-funnel at T5 minutes
• L-box
• U-box
• Fill-box
• GTM Screen Stability Test
• Ouimet

What Is U Box Test?

Equipment U-Box Test:

Procedure U-Box Test:

• About 20 litre of concrete is needed for this test.
• Ensure that sliding gate can open freely and then close it.
• Moisten the inside surface and remove any surplus water.
• Fill the one compartment of the apparatus with about 20 litre concrete.
• Leave it to stand for 1 minute.
• Lift the sliding gate and allow the concrete to flow to the other compartment.
• Once the concrete has come to rest, measure the height of the concrete in the second compartment in two places.
• Calculate the mean. Let it be H2. The height of concrete in the 1st compartment be H1.
• Calculate H1 – H2 the filling height. The whole test has to be completed within 5 minutes.

Calculations U-Box Test:

• Filling time, Express the measured filling time, TU (sec) = ______ sec
• Height in the pouring compartment (H1) = _______
• Height in the other compartment (H2) = ______
• Calculate (H1- H2) = ________

Results U-Box Test:

• The filling height of self compacting concrete is ______

Significance U-Box Test:

• If the concrete flows as freely as water, at rest it will be horizontal, so H1- H2 = 0.
• Therefore the nearer this test value, the ‘filling height’, is to zero, the better the flow and passing ability of the concrete.

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