EXPERIMENT NO-4

OBJECT: To determine the consistency of cement.

APPARATUS REQUIRED: 1.Vicat Apparatus

                                                 2. Balance

MATERIAL REQUIRED:  1. Cement

                                                2. Water

PRINCIPLE:

 The basic aim is to find out the water content required to produce a cement paste of standard consistency as specified by the IS: 4031 (Part 4) – 1988. The principle is that standard consistency of cement is that consistency at which the Vicat plunger penetrates to a point 5-7mm from the bottom of Vicat mould.

PROCEDURE:

i) Weigh approximately 400g of cement and mix it with a weighed quantity of water.
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.

OBSERVATIONS AND CALCULATIONS:

Weight of cement taken (g) = _________

Initial percentage of water added to cement = __________

Quantity of water added to cement =_______

TABLE

SL. NO.	QUANTITY OF WATER ADDED (ml)	DEPTH OF PENETRATION (mm)

Standard Consistency

= (Quantity of water for 5-7 mm penetration/Weight of cement) X 100

RESULT:

Percentage of water content for standard consistency =         %