OBJECTIVE:
Determination of specific gravity of cement using Le-Chatelier flash.
Reference: IS 4031 (Part-11):1988.
APPARATUS :
Le Chaterliers flask, weighing balance, kerosene (free from water).
MATERIAL:
Ordinary Portland cement; Water; Grease
THEORY:
Specific gravity is defined as the ratio between weight of a given volume of
material and weight of an equal volume of water. In case of cement, specific gravity is
determined by use of a Le Chatelier’s flask (Figure 3). Sometimes, a specific gravity bottle
may be employed to a standard Le Chatelier’s flask. To determine the specific gravity of
cement, kerosene is used which does not react with cement. The specific gravity of OPC is
generally around 3.15.
PROCEDURE:
1. Dry the flask carefully and fill with kerosene or naphtha to a point on the stem
between zero and 1 ml.
2. Record the level of the liquid in the flask as initial reading.
3. Put a weighted quantity of cement (about 60 g) into the flask so that level of
kerosene rise to about 22 ml mark, care being taken to avoid splashing and to
see that cement does not adhere to the sides of the above the liquid.
4. After putting all the cement to the flask, roll the flask gently in an inclined
position to expel air until no further air bubble rise3s to the surface of the
liquid.
5. Note down the new liquid level as final reading.
OBSERVATIONS:
• Weight of cement used in g. (W1) : _______
• Initial reading of flask in ml (V1) : _______
• Final reading of flask in ml (V2) : _______
• Volume of cement particle (V2 - V1) : _______
• Weight of equal volume of water in g. (W2) : _______
• Specific gravity of cement (W1/ W2) : _______
RESULT AND CONCLUSION:
Specific gravity of the given cement obtained as ___________.
VIDEO TUTORIAL: BY L AND T
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