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Question
Indian Standards classifies bitumen into grades such as 65/25, 85/40 etc. The first and second numbers respectively represent
A.
Flash point and Penetration
B.
Penetration and Softening point
C.
Softening point and Penetration
D.
Flash point and Softening point
Answer ( Option C)

Softening point and Penetration

Solution

Penetration Test: 
• The hardness of bitumen is obtained by the penetration test. 
• The unit of penetration is 1/10 mm. 
• Thus 80/100 grade bitumen means 8 - 10 mm penetration. 
Softening point: 
• The softening point is the temperature at which the substance attains a particular degree of softening under the specified conditions of the test. 
• The apparatus used to determine softening point of bitumen is RING AND BALL assembly. 
As per BIS bitumen grade 85/40, 65/25, etc. the first and second number represents softening point and penetration or consistency point.

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