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Estimating Sheet

How to find out specific cement gravity

Construction Software

Finding out the specific gravity is generally defined as the ratio between the mass of a specified volume of substance and weight of a corresponding volume of water. To settle the specific gravity of cement, kerosene is used. If kerosene is combined with cement, it does not make any reaction.

Apparatus: Le Chaterlier”s flask, weighing balance, kerosene (without water).

Le Chaterlier”s flask, is built up from thin glass that contains a bulb at the base. The full capability of the bulb is roughly 250 ml. The bulb is roughly 7.8 cm in mean diameter. The unit for calculating stem is millimeters. The zero graduation exists at the space of 8.8 cm from the top of the bulb. At 2 cm from the zero, adjacent is another bulb of length 3.5cm and capability of 17 ml. At 1 cm from bulb, the stem is listed with 18 ml and is marked up to 24 ml. The section over 24ml mark takes the shape of a funnel having diameter 5cm.


(I) Dehydrate the flask with proper care and load kerosene. Alternatively, naptha can also be applied to a mark on the stem among zero and 1 ml.

(II) Note the intensity of the liquid in the flask as prime reading.
(III) Keep a weighted quantity of cement (about 60 gm) within the flask in order to increase the level of kerosene up to around 22 ml mark. Proper care should be taken in advance so that splashing does not occur as well as cement does not affix to the sides of the beyond the level of liquid.

(IV) Once the cement is kept to the flask, gradually roll the flask in a bent position to drive out air unless no extra air bubble elevates to the surface of the liquid.
(V) Record the new liquid level as concluding reading.

How to find out specific cement gravity

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