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GATE-Civil-Engg-2018-->View question

A bitumen sample has been graded as VG30 as per IS : 73-2013. The ‘30’ in the grade means that (GATE-CIVIL-Engg-2018)

A bitumen sample has been graded as VG30 as per IS : 73-2013. The ‘30’ in the grade
means that
(A) penetration of bitumen at 25C is between 20 and 40
(B) viscosity of bitumen at 60C is between 2400 and 3600 Poise
(C) ductility of bitumen at 27C is more than 30 cm
(D) elastic recovery of bitumen at 15C is more than 30%


Asked On2019-04-11 14:03:08 by:naikaumprakash

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Ans. (B) 
Sol. As per IS 73-2013, 
grade of bitumen is based on penetration value and viscosity at 60 
C  (summer road surface temperature) (or) 135 C  (mixing temperature). 
VG 30 means viscosity is in the range of (100 20) 30   i.e. 
80 30  to 120 30  poise  
2400 to 3600 poise 


Answerd on:2019-05-24 Answerd By:Jaynil-Gaglani

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