CONSISTENCY test on cement

Updated: May 1, 2020

1.2 CONSISTENCY

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. 2 : VICAT 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

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.

REPORTING OF RESULTS

Express the amount of water as a percentage of the weight of

dry cement to the first place of decimal.



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