How to determine the specific gravity of cement

In this construction video tutorial you will learn how to determine the specific gravity of cement. To perform this various equipments like specific gravity bottle, kerosene, cement as well as water are used.

To determine the specific gravity the following methods are applied :-

Weight of empty specific gravity bottle (W1) – The bottle should completely dry and empty. The weight should be measured with the bottle along with it’s stopper. It should be taken as W1.

Weight of specific gravity bottle and cement (W2) – Here the half portion of the bottle should be filled with cement. Clean the outside surface of the bottle properly. The weight should be measured with bottle along with stopper and cement. It should be taken as W2.

Weight of specific gravity bottle, cement and kerosene (W3) – Here, the half portion of the bottle should be filled with cement and other half should be filled with kerosene. Clean the outside surface of the bottle neatly. The weight should be measured with the bottle along with it’s stopper, cement and kerosene. It should be taken as W3.

Weight of specific gravity bottle and kerosene (W4) – Here, the bottle should be emptied completely and again filled with kerosene after cleaning it neatly. The weight should be measured with the bottle along with stopper and kerosene. It should be taken as W4.

Now the specific gravity of cement will be determined with the following formula :-

W2 – W1/(W2-W1) ¬– (W3 – W4) x 0.79

By applying the following formula, the value of 0.79 is obtained :-

W4 – W1/W5 – W1 (here, W5 denotes weight of specific gravity bottle + water)

To have more details, go through the following video tutorial.

Video Source: L & T - Learning Technology