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GATE 2024 CE (CE1) – Question 24

Highway Pavements · Bituminous paving mixes · 1 mark · Multiple choice

Which one of the following statements related to bitumen is FALSE?

  1. Kinematic viscosity is a measure of resistance to the flow of molten bitumen under gravity.
  2. Softer grade bitumen possesses higher softening point than hard grade bitumen.
  3. Flash point of bitumen is the lowest temperature at which application of a test flame causes vapours of the bitumen to catch an instant fire in the form of flash under specified test conditions.
  4. Ductility test is carried out on bitumen to test its adhesive property and ability to stretch.

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Show answer and explanation

Correct answer: (B) Softer grade bitumen possesses higher softening point than hard grade bitumen.

Explanation

A softer grade of bitumen has a lower softening point than a hard grade, not a higher one, so B is false. The other three are standard descriptions: kinematic viscosity is flow under gravity, the flash point is as described, and the ductility test checks the ability to stretch (and so the adhesion and cohesion) of bitumen.