Flow Table Test Of Concrete | SCC Concrete Test | Free Flow Concrete Test At Site l Fresh Concrete

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Flow table test of concrete
Flow table test of concrete also determines the Quality of Concrete concerning its consistency, cohesiveness and the proneness to segregation.
This test for self compacting concrete where reinforce is congested and compaction not possible by vibrator.
1. Use for high or very high workable concrete also called as collapses slump
2. Not suitable for aggregate size =38 mm
3. Is code : 1199
3. Size of floe table is 760 * 760 mm

The flow test is performed to measure the workability of concrete. In this test the workability of concrete is measured by examining the flowing property or fluidity of concrete. The flow test is a simple laboratory test. This test works on the principle of a jolting of the standard mass of concrete and measured by the flow of concrete. The flow of concrete indicates the workability of concrete.

The flow test is used to measure the workability of high or very high workable concrete, which eventually collapses a slump. It gives an idea about the quality of the concrete concerning consistency and cohesiveness. This workability test is quite simple to perform and is the best for the concrete which has a nominal maximum size of aggregate less than 38 mm.
APPARATUS USED
Flow table
mould
Scale
Hand scoop
Trowel
Tamping rod
The shape of the mold for the flow table test is a cone frustum. The base diameter of the Mould is 25 cm and the upper diameter is 17 cm. It has a height of 12 cm. A handle is also present on the sides of the Mould.
Flow table Test procedure
Before starting the test, wet and clean the tabletop and the Mould from gritty materials.
Keep the mould firmly at the centre of the table.
Now fill two-layer, each layer should be one half of the volume of the Mould
Tamp each layer 25 times using a tamping rod uniformly.
After tamping the top layer, struck off the excess concrete using the trowel.
Also, clean the area of the table outside the mould.
Then remove the mould immediately by steady upward pull.
Raise the table and drop at 12.5 mm, 15 times in 15 seconds.
Measure the diameter of the concrete spread about its 6 direction and compute its mean value.
CALCULATION

The percentage increase in the average diameter of the spreading concrete over the base diameter of the mould is called the flow of concrete.

Flow% = (Spread diameter in cm – 25) / 25 * 100

The value of flow test varies from 0 to 150%.
or
Slump flow = (D1+ D2) / 2



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Procedure for Concrete Flow table Test