Vicat Test – Consistency Test of Cement

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 7 mm from the bottom of

the Vicat mould.

APPARATUS

Vicat apparatus conforming to IS: 5513 – 1976

Balance, whose permissible variation at a load of 1000g should be +1.0g

Gauging trowel conforming to IS: 10086 – 1982

PROCEDURE

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.

Fill the Vicat mould with paste and level it with a trowel.

Lower the plunger gently till it touches the cement surface.

Release the plunger allowing it to sink into the paste.

Note the reading on the gauge.

Repeat the above procedure taking fresh samples of cement and different quantities of water until the reading on the gauge is 5 to 7mm.

RESULTS

Express the amount of water as a percentage of the weight of dry cement to the first place of decimal.

Technical Discussion

If you add Less water than its quantity couldn’t complete chemical reaction. Thus, resulting is reduction of strain.

If you add more water would increased water cement ratio and so would reduce its strength.

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