GATE CE 2015 Set 1 — Question 32
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Transportation Engineering → Bitumen & Mix Design → Penetration Test
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Question
The penetration value of a bitumen sample tested at is 80. When this sample is heated to and tested again, the needle of the penetration test apparatus penetrates the bitumen sample by mm. The value of CANNOT be less than __________ mm.
Correct answer
8 to 8
Solution
The penetration value is measured in units of mm. A penetration value of 80 at corresponds to a depth of mm. Bitumen is a thermoplastic material, meaning its consistency decreases (it softens) as the temperature increases. Therefore, at a higher temperature of , the bitumen will be softer than at , and the penetration depth must be greater than or equal to the depth at . Thus, mm. The minimum possible value for is 8.
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