The GATE Grind

GATE 2018 CE (CE2) – Question 27

Highway Pavements · Design of flexible and rigid pavements · 1 mark · Multiple choice

According to IRC:37-2012 referred to in the paper, which parameter controls subgrade rutting in flexible pavements?

  1. horizontal tensile strain at the bottom of the bituminous layer
  2. vertical compressive strain on top of the subgrade
  3. vertical compressive stress on top of the granular layer
  4. vertical deflection at the pavement surface

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Show answer and explanation

Correct answer: (B) vertical compressive strain on top of the subgrade

Explanation

Subgrade rutting is controlled through the **vertical compressive strain at the top of the subgrade, B**. Horizontal tensile strain at the bottom of the bituminous layer is instead associated with fatigue cracking of that layer.