GATE CE 2018 Set 1 — Question 24
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Transportation Engineering → Bitumen & Mix Design → Bitumen Properties
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Question
A bitumen sample has been graded as VG30 as per IS : 73-2013. The ‘30’ in the grade means that
Correct answer
(B) viscosity of bitumen at 60^ is between 2400 and 3600 Poise
Solution
Viscosity Grading (VG) of bitumen is based on absolute viscosity at . The number in the grade (e.g., 30 in VG30) represents the absolute viscosity in Poise divided by 100. For VG30, the absolute viscosity at is Poise, which means it ranges from 2400 to 3600 Poise. Hence, the correct option is (B).
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