Test Methods for Self Compacting Concrete

 Test Methods for Self Compacting Concrete

 A concrete mix can only be classified as self compacting concrete if the requirements for all the following three workability properties are fulfilled.

1.     Filling ability

2.     Passing ability and

3.     Segregation resistance.

Filling Ability of Self Compacting Concrete

It is the ability of SCC to flow into all spaces within the formwork under its own weight. Tests, such as slump flow, V-funnel etc, are used to determine the filling ability of fresh concrete.

Passing Ability of Self Compacting Concrete

It is the ability of SCC to flow through tight openings, such as spaces between steel reinforcing bars, under its own weight. Passing ability can be determined by using U-box, L-box, Fill-box, and J-ring test methods.

Segregation Resistance

The self compacting concrete must meet the filling ability and passing ability with uniform composition throughout the process of transport and placing.

 Workability of Self Compacting Concrete

Test methods to determine workability of Self Compacting Concrete are:

1. Slump flow test

The slump flow test is used assess the horizontal free flow of self compacting concrete in the absence of obstructions. The test method is based on the test method for determining the slump.

  2. V Funnel Test

V funnel test on self compacting concrete is used to measure the flow ability. But the flow ability of concrete is affected by its other properties as well which may affect the flow ability of the concrete during testing.

3. L Box Test

This test assesses the flow of the concrete and also the extent to which it is subjected to blocking by reinforcement.

 4. U Box Test

U Box test is used to measure the filing ability of self compacting concrete. U box test was developed by the Technology Research Centre of the Taisei Corporation in Japan. Some time the apparatus is called a “box shaped” test.


 5. Fill Box Test

Fill box test is also known as ‘Kajima test’ is used to measure the filling ability of self compacting concrete with a maximum aggregate size of 20 mm.



 

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