How to check the specific gravity of cement

[Srinivasan]

How to check the specific gravity of cement
REF: IS 4031 - 1988

AIM:
To determine the specific gravity of cement

DEFINITION:
Specific gravity of cement is defined as the ratio of weight of a given volume of cement at a given temperature to the weight of an equal volume of distilled water at the same temperature both weights being taken in air.

APPARATUS:
Specific gravity bottle, weighing balance

MATERIAL:
Kerosene free of water, naphtha having a specific gravity not less than 0.7313 shall be used in the specific gravity determination.

PROCEDURE:
1. Wt. of empty dry specific gravity bottle = W1
2. Wt. of bottle + Cement (filled 1/4 to 1/3 ) = W2
3. Wt. of bottle + Cement (Partly filled ) + Kerosene = W3
4. Wt. of bottle + Kerosene (full). = W4
5. Wt. of bottle + water (full) = W5 Specific gravity of kerosene Sk = (W4 – W1) / (W5 – W1) (W2 –W1) x Sk

Specific gravity of Cement = --------------------------- (W4 – W1) – (W3 – W2)

 

[Parvesh Pal]

Why did we get all this sir? Is that compulsory at every site?

 

[Srinivasan]

it is compulsory to keep the equipment at site.unfortunately the real estate developers don't keep at site except few developers

 

[Dnyan Deshmukh]

Why did we get all this sir? Is that compulsory at every site?

Testing of materials is necessary to ensure you get Quality Material for construction.

Else you might get severe failures.

Like indian cinemas, contractor put less cement or low quality cement etc and then bridge or building collapse.