Flow Table Test
The flow table test is used to measure the flow and workability of the concrete by using a flow table, it is a method to determine the consistency of fresh concrete.
Flow Table Test Apparatus (Equipment)
The flow table test apparatus are Flow table with a grip and a hinge, an Abrams cone, tamping rod.
Also Read :Â Non-Destructive Testing of concreteÂ
Flow Table Test Procedure
- The table top is cleaned of all materials and then it is wetted using water. The mould is kept on the centre of the table, firmly held, and filled in two layers.
- Then a tamping rod of 1.6cm in diameter and 61cm long rounded at the lower tamping end is used to rod 25 times on each layer
- The extra concrete that has overrun the mould is removed once the top layer has been rodded evenly.
- If the mould is raised vertically, the concrete will stand upright without assistance. Next, the table is lifted and then lowered by 12.5 cm 15 times in roughly 15 seconds.
- The average spread is noted after measuring the concrete’s diameter in about six directions to the nearest 5mm. The percentage increase in the spread of concrete’s average diameter over the mould’s base diameter is known as the flow of concrete.
- The value could be in the range of 0% to 150%. Concrete’s distribution pattern can be closely examined to reveal details about its properties, such as its propensity for segregation.
Flow Table Test Calculation
The formula for Flow Table Test is given below
\[\text { Flow Percentage }=\frac{\text { Spread diameter in cm − 25 }}{25} \times 100\]
Note: The value of the flow test may vary from 0 to 150%.
The formula for the Flow Value of concrete
\[\text { Flow Value of Concrete }=\frac{D_1+D_2}{2}\]
Flow Table Test Diagram
Flow Table Test Results
The flow percentage of the concrete will be obtained as the result.
Flow Table Test Standard
Specification for a flow table to be used in tests of hydraulic cement and pozzolanic materials, IS 5512 (1983).
Advantages of Flow Table Test
- The test is dynamic, making it particularly suitable for extremely thixotropic concrete mixtures.
- The test is straightforward and practicable, it swiftly offers a direct result.
- It also returns a clear result right away.
Also Read: Compaction Factor Test of Concrete
Flow Table Test Vs Slump Test
| Flow Table Test | Slump Test |
| The flow test is used to evaluate how easily concrete can be worked. | The purpose of the slump cone test is to evaluate the consistency or workability of a laboratory-prepared concrete mix. |
| In this test, the fluidity or flowing characteristic of the concrete is used to determine how easily it may be worked. | Fresh concrete must undergo a slump test both at the pour point right away after being released from the transit mixture and on-site immediately following production at the batching plant to confirm the workability is consistent with the design mix requirements. |
| In this test, the fluidity or flowing characteristic of the concrete is used to determine how easily it may be worked. | Again, the concrete slump test, also known as the slump cone test, is used to assess the workability or consistency of concrete mix that has been prepared in a laboratory or on a building site as the project progresses. |
| The flow test is used to evaluate how well high or very high workable concrete can be worked before it slumps. | To ensure that the quality of the concrete is consistent throughout the construction process, the concrete slump test is performed on each batch. |
| It provides insight into the consistency and cohesion of the concrete’s quality. This workability test is the best for concrete with a nominal maximum size of aggregate less than 38 mm since it is so easy to conduct. | According to the steps outlined in ASTM C143 in the United States, IS: 1199 – 1959 in India, and EN 12350-2 in Europe, the slump is carried out. |
FAQ
Flow Table Test Apparatus Dimensions
The tool is a flow table with a diameter of roughly 76 cm and marked with concentric circles. The following internal dimensions are utilised with a cone-shaped mould manufactured from a smooth metal casing. The cone’s height is 12 cm, and the base is 25 cm in diameter with a 17 cm upper surface.
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