The self compaction concrete is the high fluidity concrete. It is used where the location is congested by reinforcement and no possibility of compaction of concrete by mechanically or manually.
We have already discussed the L box test, which is used to determine the workability of Self-compacting concrete.
The test used to find the filling and passing ability of freshly mixed Self-compacting concrete with the help of a U shape box is called the U box test.
Generally, slump tests are used to find the workability of high slump value concrete, but here the slump test is not suitable for SCC because of its high fluidity. So the U box test is used to find the workability.
It is a simple and easy method, and the total test can be completed within 5 to 10 minutes.
Filling height = H1 – H2
The flow and passing ability of the concrete is good when the filling ratio is near to zero. Do the test at least 3 times and average the value as workability of Self-compacting concrete.
The filling concrete can be cleaned by rotating the box upside down.
Happy Learning 🙂
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