Question

The specific gravity of bitumen varies from:
1. 0.87 to 0.92
2. 0.97 ta 0.96
3. 0.82 to 0.85
4. 0.97 to 1.02

Answer 1

Correct Answer - Option 4 : 0.97 to 1.02

Concepts:

Specific gravity is the ratio of the mass of a given volume of the material at 25 °C to that of an equal volume of water at the same temperature.

The specific gravity of pure bitumen ranges from 0.97 to 1.02.

Additional Information:

1. The minimum specific gravity of paving bitumen at 27°C shall be 0.99 for grades A25, A35, A45, A65, S35, S45, and S65, 0.98 for A90, and S90 and 0.97 for grades A200 and S200.

2. Specific gravity of the bitumen can be determined by:

\( G = \frac{c-a}{(b-a)-(d-c)}\)

a = Weight of the pycnometer bottle

b = Weight of the pycnometer bottle + weight of distilled water

c = Weight of the pycnometer bottle + Weight of the specimen half-filled in the bottle

d = Weight of the pycnometer bottle + Weight of the specimen half-filled in the bottle + Weight of the water-filled in the remaining half of the bottle