Bitumen of grade VG-30 (Viscosity Grade) used in road construction has:
Choose the correct answer
Penetration 30 mm at 25°C
Absolute viscosity at 60°C = 2400–3600 poises (stiff grade suitable for normal highway conditions)
Setting time of 30 minutes
30% bitumen content in mix
Correct Answer
B. Absolute viscosity at 60°C = 2400–3600 poises (stiff grade suitable for normal highway conditions)
Why is this the answer?
VG-30 (IS 73:2013): Viscosity Grade bitumen with absolute viscosity at 60°C = 2400–3600 poises (poise = dyne·s/cm²). Replaces old 60/70 penetration grade. Higher VG number = stiffer bitumen = harder. VG-30 is for NE/plains, VG-40 for high traffic and hotter regions. VG grades are more temperature-consistent specification than penetration grades.
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