Workability of Fresh Concrete by Vee-Bee Consistometer

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To determine the workability of fresh concrete by using a Vee-Bee consistometer as per IS: 1199 – 1959. The apparatus used is Vee-Bee consistometer.
Procedure to determine workability of fresh concrete by Vee-Bee consistometer.

i) A conventional slump test is performed, placing the slump cone inside the cylindrical part of the consistometer.

ii) The glass disc attached to the swivel arm is turned and placed on the top of the concrete in the pot.

iii) The electrical vibrator is switched on and a stop-watch is started, simultaneously.


iv) Vibration is continued till the conical shape of the concrete disappears and the concrete assumes a cylindrical shape.

v) When the concrete fully assumes a cylindrical shape, the stop-watch is switched off immediately. The time is noted.The consistency of the concrete should be expressed in VB-degrees, which is equal to the time in seconds recorded above.


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  • gayatri April 18, 2012 at 1:07 am

    what is the meaning of intial reading as graduate rod a=,final reading as graduate rod b=

  • Murugappan September 26, 2012 at 9:17 pm

    Means of initial reading=before the slump

  • Silambarsan October 30, 2012 at 9:25 pm

    if slump value concrete increase vee-bee degree increase or decrease ?

    • RIZWAN April 7, 2014 at 5:42 am


  • john December 10, 2012 at 3:35 am

    what is the workability of concrete?

  • MOSESLENIN September 25, 2013 at 3:09 am


  • Adil April 20, 2014 at 1:51 am

    how to expressed time in VB-degrees

  • sarvesh sharma May 2, 2017 at 9:35 am

    how we found vee-bee degree

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