AIM:-
To determine the quantity of water required to produce a cement paste of standard consistency as per IS: 4031 (Part 4) -1988
PRINCIPLE:-
The standard consistency of a cement paste is defined as that consistency which will permit the Vicat plunger to penetrate to a point 5 to 7mm from the bottom of the Vicat mould.
APPARATUS:-
FIG : ALL APPARATUS
i) Vicat apparatus conforming to IS: 5513 - 1976
ii) Balance, whose permissible variation at a load of 1000g should be +1.0g
iii) Gauging trowel conforming to IS: 10086 - 1982
iv) Graduated jar to measure water.
V) Non Porous Plate,
TEMPERATURE & HUMIDITY:-
The temperature of the gauging room, dry materials & water should be maintained at 27 ± 2 0 C & relative humidity required 65±5%.
PROCEDURE:-
i) Weigh approximately 400g of cement and mix it with a weighed quantity of water. The time of gauging should be between 3 to 5 minutes.
ii) Fill the Vicat mould with paste and level it with a trowel,
iii) Lower the plunger gently till it touches the cement surface.
iv) Release the plunger allowing it to sink into the paste,
v) Note the reading on the gauge.
vi) Repeat the above procedure taking fresh samples of cement and different quantities of water until the reading on the gauge is 5 to 7mm.
vii) Continue the same process with the varying percentage of water in the range of 25% to 35% until the desired limit not achieved.
RESULTS:-
Express the amount of water as a percentage of the weight of dry cement to the first place of decimal.
PRACTICE MODULUS :-
