consistency test of cement

Name of experiment:-To determine the percentage of water for normal consistency for a given sample of cement.


Apparatus :-
1)Vicat’s apparatus with plunger of 10mm dia, 
2)measuring cylinder,
3)weighing balance, 
4)weight box, , 
5)trowel.

Theory : 
Standard consistency of cement is defined as that consistency
witch will permit plunger to penetrate at 33.34 from the top of the
mould. The consistency cement paste is expressed as a percentage
by wt of dry cement. Usually this percentage varies from 26% to
33%.


Vicat’s Apparatus : As vicat’s apparatus consist of a frame bearing a movable rod of
weight 300grms. At the upper end of this rod a cap is provided low
rend 1.13mm n of weight 300grms. It the upper end of this rod a
cap is privy deed while at the 1.13mm needle or plunger of 10mm
diameter is shown in figure

Diagram : Vicat’s apparatus, plunger

Vicat's appratus         

Procedure

1.Take 400gm of cement and weight carefully and Add 20% water
in Care should be taken that mining time is not less than 3min and
gauging shall be counted from the time of adding water

2.Fill the paste in the mould .The excess paste to trim off and
vibration are given to remove air bubbles.

3.Fix the 10mm dia. plunger in the moving rod and bring down in
touch with the paste

4.Release the plunger.

5.Repeal the procedure till it penetrate 33-34mm from the top &
note down the water percentage

prepare a observation table

Precaution
1) The procedure should be conducted within 3-5min
2) The reading should be taken carefully

Result
The percentage of water for normal consistency for the given sample of cement is ……..




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