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Heavy Equipment Operator Certification Exam Prep · Question

What is the typical maximum lift thickness for asphalt concrete to be compacted by conventional vibratory rollers on a provincial highway project to achieve specified density and smoothness?

For asphalt concrete, lifts typically range from 50 mm to 100 mm. Compacting lifts thicker than 100 mm can be challenging to achieve uniform density throughout

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Question: What is the typical maximum lift thickness for asphalt concrete to be compacted by conventional vibratory rollers on a provincial highway project to achieve specified density and smoothness?

Answer options:

  • 25 mm
  • 50 mm ✅ 100 mm
  • 150 mm

Correct answer: 100 mm

Explanation: For asphalt concrete, lifts typically range from 50 mm to 100 mm. Compacting lifts thicker than 100 mm can be challenging to achieve uniform density throughout the depth and maintain surface quality without specialized equipment.

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