specific gravity test of Bitumen

AIM:
To determine the specific gravity of semi-solid bitumen road tars, creosote and anthracene oil as per IS: 1202 – 1978.

PRINCIPLE:
It is the ratio of mass of a given volume of bitumen to the mass of an equal volume of water, both taken at a recorded/specified temperature.

APPARATUS:

Image result for specific gravity test of bitumen
SPECIFIC GRAVITY BOTTLES

i) Specific gravity bottles of 50ml capacity
ii) Water bath
iii) Bath thermometer – Range 0 to 44 oC, Graduation 0.2 oC

SAMPLE:
Take the sample (half the volume of the specific gravity bottles).

PROCEDURE:
i) Clean, dry and weigh the specific gravity bottle along with the stopper (Weight ‘A’).
ii) Fill the specific gravity bottle with freshly boiled distilled water and insert the stopper firmly. Keep it in the water bath having a temperature of 27.0 + 1 oC for not less than half an hour and weigh it (Weight ‘B’).
iii) Weigh the specific gravity bottle about half-filled with the material (Weight ‘C’).
iv) Weigh the specific gravity bottle about half-filled with the material and the other half with distilled water (Weight ‘D’).
v) Weigh the specific gravity bottle completely filled with the material (Weight ‘E’). 

RESULTS:
i) Specific gravity (Solids and semi-solids) = (C-A)/{(B-A)-(D-C)
ii) Specific gravity (Liquids) = (E-A)/(B-A)

The average of the two results should be reported.

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