What is Vee Bee Consistometer Test?

 
Vee bee consistometer test is named after the Sweden developer V Bahrmer and it is covered by IS: 1199–1959. It is used to determine workability of concrete using consistometer. It is usually performed on dry and fresh concrete and it is not suitable for very wet concrete.

Vee bee consistometer test carries out the relative effort measurement to change the mass of the concrete mix from one definite shape to another definite shape (from the slump conical shape to the cylindrical shape) by conducting vibration process. This effort is known as remoulding effort and the measurement of the effort is done by time measurement in seconds. It is called as Vee Bee Seconds.

When the concrete mix having slump value more than 50 mm remoulds quicker where measuring the time is not possible, the time

* Vee-bee consistometer test is specially used for determining very low workability of concrete mix.

Vee Bee Consistometer Test, Vee Bee Test of Concrete



Hi friends, you are welcomed in the world of Civil Allied Gyan. "Read here definition, apparatus, IS code, test procedure, formula, result and lab report about vee-bee consistometer test of concrete for workability."

 

By the help of this you can easily determine the workability of dry and fresh concrete by vee-bee consistometer test.



Apparatus Required for Vee Bee Consistometer Test:-

  • Vee-Bee consistometer test apparatus
  • Sheet metal slump cone
  • Stopwatch
  • Standard iron graduated rod
  • Weighing balance
  • Tamper (16 mm in diameter and 600 mm length)
  • Trowels
  • Glass disc
  • Cylindrical containers


Vee Bee Test Machine (Apparatus)
Vee bee test machine (apparatus) consists of a vibrating table which is mounted on an elastic support. The vibrator is operated electrically. The length and width of a vibrating table are respectively 380 mm and 260 mm.

On the surface of the vibrating table, a cylindrical container is attached using wing nuts. Slump cone and a cylindrical jar are placed as shown in the figure. The sheet metal cylindrical container is screwed to the vibrating table through wingnuts.

The slump cone, of height 300 mm which is open on both sides and has a diameter of 200 mm at the bottom and 100 mm at the top, is inserted into the cylindrical container to perform the test.

The graduated rod which has a scale is used for measuring the workability of the sample.

As shown as in the figure, the whole arrangement is mounted on a sturdy base. The base consist of a swivel arm holder. There is another swivel arm that consist of a funnel and a guide sleeve is fixed into it.

A standard iron graduated rod is fixed to the swivel arm through the guide sleeve. It has the provision for screwing the transparent disc.

The bottom base consists of a swivel arm holder where the swivel arm is fixed to the funnel and guide sleeve as shown in the figure.


IS Code for Vee Bee Consistometer Test of Fresh Concrete

  • IS: 1199-1959, Methods of sampling and analysis of concrete mix
  • IS: 456-2000, Code for practice of reinforced and plain concrete
  • IS: 10510:1983, Specifications for vee-bee consistometer

Vee Bee Test of Concrete, Vee Bee Consistometer Test

Procedure for Vee Bee Consistometer Test of Concrete:-

  1. The sheet metal slump cone is filled with four layers of concrete. Each layer of concrete is one fourth the height of the cone. 
  2. The sheet metal slump cone is placed inside the sheet metal cylindrical container that is placed in the consistometer.
  3. The as described earlier is performed to find the slump value (in mm).
  4. The glass disc attached to the swivel arm is turned and placed on the top of the concrete in the slump cone placed inside the cylindrical container.
  5. Then the electrical vibrator is switched on and at the same time a stop watch is started. The concrete is allowed to spread out in the sheet metal cylindrical container.
  6. Until the slump conical shape of the concrete disappears and the concrete assumes a cylindrical shape, the vibration is continued. This can be decided by observing the glass disc from the top for disappearance of transparency.
  7. When the concrete fully changed to a cylindrical shape, immediately the stopwatch is switched off.
  8. The time required for the shape of concrete to change from slump cone shape to cylindrical shape in seconds is recorded. This time is expressed as Vee Bee Degree or Vee Bee Seconds. It gives us the measure of workability of the fresh concrete.

*This method is very suitable for very dry and fresh concrete whose slump value cannot be measured by Slump Test, but the vibration is too vigorous for concrete with a slump value more than about 50 mm. 



Observations:-
  • Type of cement=……………….
  • Brand of cement=………………. 


Table 1:
Vee-Bee Consistometer Test Procedure, Workability of Concrete


Table 2: Consistency Measurement for Different Workability Mix in Slump Test, Compaction Factor Test and Vee-Bee Test
Workability Description
Workability Measurement
Slump (in mm)
Compaction Factor
Vee-bee degree (in second)
Extremely Dry
-
-
32-18
Very Stiff
-
0.70
18-10
Stiff
0-25
0.75
10-5
Stiff Plastic
25-50
0.85
5-3
Plastic
75-100
0.90
3-0
Flowing
150-175
0.95
-


Results:-
The Vee-Bee degree (or Vee-Bee seconds) = ……… seconds.

Report:-

The result of Vee-Bee consistometer test is a time period. This time is expressed as vee bee degree or vee bee seconds.




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