Determination of Consistency of Fresh Concrete – Vee Bee Test 61

General Specification:

Container internal diameter of 240 ± 5mm and a height of 200 ± 2 mm; wall thickness 3 mm; Base thickness 7 mm.

The transparent disc shall be 230 ± 2 mm in diameter and 10 ± 2 mm in thickness.

The disc weight has a mass of 2 750 ± 50g.

Slump Test Apparatus

Mixing Tray

Scoop

Stopwatch

Vee Bee Test Procedure for Consistency  of Concrete

1. Completely Clean the Consistometer. Dampen all the non-absorbent parts of apparatus which are to handle concrete.

2. Place the cylindrical container over the vibrating table.

3. Place the slump cone in container.

4. Place the sample concrete in the cone in three layers, maintaining all specified operations in slump test.

5. Adjust the transparent disc at top level of cone along with weight over it, with the help of swivel arm. And note the scale reading.

6. Next uplift the cone and let the concrete slump. Allow to fall the disc in controlled way till it touches the top of slumped concrete. Notice the scale reading again to get the true slump value in mm.

7. Now uncontrol the movement of disc with the controlling screw.

8. Start the vibrating table and the stopwatch. (The vibrator shall operate at a frequency of 55 ± 5.5 Hz and the vertical amplitude of vibration of the table with empty container on the top of it shall be approximately 0.5 ± 0.02 mm. )

10. The slumped concrete gradually changes its shape as it goes down and adjust itself to the walls of the container. And so is the movement of disc over it.

11. A stage comes when the transparent disc is in full contact with the cylindrical shape of the concrete mass. At this stage stop the vibrating table and the stopwatch.

13. Find the time difference of initial and final stopwatch

14. The time elapsed in seconds gives the consistency of concrete.

16. It is called Vee Bee degree or Vee Bee time in seconds.

Vee Bee Test Record Sheet