Flow table test of concrete to test workability of concrete

 

Flow table test of concrete to test workability of concrete

Float Test of Concrete 

Workability is a complex property of concrete which directly impacts on Concrete strength, quality and appearance.

It also determines how easily freshly made concrete can be mixed, placed, compacted and finished with the minimum to no loss concerning homogeneity.

As mentioned above, its a complex property which involves many factors concerning the good workable concrete. 

To test the freshly mixed concrete workability, the following tests are usually performed on field and lab.

Flow table test of concrete:

As the name of the test, the workability of concrete is determined by examining the flowing property of concrete.

These tests, also determines the Quality of Concrete concerning its consistency, cohesiveness & the proneness to segregation.

As there are two methods to find the flow value of concrete. 

This new flow table test is covered with BS 1881 part 105 of 1984 and DIN 1048 part I.

Apparatus of Flow Table Test :

Flow table made of metal having thickness 1.5mm and dimensions 750mmx 750mm, tamping rod made of hardwood, Scoop, Centimeter Scale, Metal Cone or mould (Lower Dia = 20cm, upper Dia = 13 cm, Height of Cone = 20cm). 

The middle portion of flow table is marked with a concentric circle of dia 200mm to place a metal cone on it.

The more details about Flow table is depicted in the below image go through it if required.

Procedure of flow table test:

1. For Float test of concrete, first step is to Prepare concrete as per mix design & then place the flow table on a horizontal surface.
2. After that, we should Clean the dust or other gritty material on Flow table & Sprinkle water on it.
3. Now, we have to then place the metal cone at the middle portion of the flow table & stand on it.
4. After that, we should Pour the freshly mixed concrete in the mould comprising two layers; each layer should be tamped with tamping rod for 25 times.
5. After tamping the last layer, the overflowed concrete on the cone is struck off using a trowel.
6. Then, we have to now lift the mould vertically up & let concrete stand itself without any support.
7. The flow table is raised at the height of 12.5 mm & dropped. The same process repeated for 15 times for 15 secs.
8. Measure the spread of concrete Diameter using centimetre scale horizontally & vertically. The arithmetic mean of the two diameters shall be the measurement of flow in millimetres.

Formula for Flow value of concrete :

Video Explanation of Flow table test of Concrete :-

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