The GATE Grind

GATE 2018 CE (CE1) – Question 24

Highway Pavements · Highway materials and tests · 1 mark · Multiple choice

A bitumen sample is VG30 according to IS:73-2013 referred to in the paper. The “30” indicates ______.

  1. penetration at 25°C between 20 and 40
  2. viscosity at 60°C between 2400 and 3600 poise
  3. ductility at 27°C greater than 30 cm
  4. elastic recovery at 15°C greater than 30%

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Correct answer: (B) viscosity at 60°C between 2400 and 3600 poise

Explanation

VG denotes viscosity grading. For the historical standard quoted in the question, VG30 corresponds to an absolute viscosity at 60°C of **2400–3600 Poise, B**. The numeral does not describe a penetration range, a ductility length or an elastic-recovery percentage.