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Q: Which of the following does NOT represent the grade of Bitumen based on viscosity?
  • A. VG-30
  • B. VG-50
  • C. VG-40
  • D. VG-20
Correct Answer: Option B - As per IS 73:2006, bitumen is classified into four types based on viscosity grade. Grade Suitable for 7 day average maximum air temperature (ºC) VG-10 < 30 VG-20 30-38 VG-30 38-45 VG-40 >45 Note–Higher the number of grade, the harder the bitumen in the viscosity grading system.
B. As per IS 73:2006, bitumen is classified into four types based on viscosity grade. Grade Suitable for 7 day average maximum air temperature (ºC) VG-10 < 30 VG-20 30-38 VG-30 38-45 VG-40 >45 Note–Higher the number of grade, the harder the bitumen in the viscosity grading system.

Explanations:

As per IS 73:2006, bitumen is classified into four types based on viscosity grade. Grade Suitable for 7 day average maximum air temperature (ºC) VG-10 < 30 VG-20 30-38 VG-30 38-45 VG-40 >45 Note–Higher the number of grade, the harder the bitumen in the viscosity grading system.