The GATE Grind

GATE 2018 CE (CE2) – Question 28

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

Initial concavity in a CBR load–penetration curve is NOT due to ______.

  1. uneven top surface
  2. high impact at the start of loading
  3. inclined penetration plunger
  4. soft top layer of soaked soil

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Show answer and explanation

Correct answer: (B) high impact at the start of loading

Explanation

Initial concavity commonly reflects seating and contact problems, including an uneven surface, inclined plunger, or a softer surface layer. **High impact at the start of loading, B**, is not the conventional seating explanation; the CBR load is applied at a controlled penetration rate.