Heavy Equipment Operator Certification Exam Prep · Question
An operator is working on a municipal project and is given specifications for compacting a cohesive subgrade. The lift thickness is specified as 150 mm. Which type of compactor is generally most efficient for achieving compaction in this type of material and thickness?
For cohesive subgrades, a padfoot vibratory compactor is typically the most efficient. Its feet penetrate and knead the soil, compacting from the bottom up, ide
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Question: An operator is working on a municipal project and is given specifications for compacting a cohesive subgrade. The lift thickness is specified as 150 mm. Which type of compactor is generally most efficient for achieving compaction in this type of material and thickness?
Answer options:
- Smooth drum vibratory compactor
- Pneumatic tire roller ✅ Padfoot vibratory compactor
- Double drum static roller
Correct answer: Padfoot vibratory compactor
Explanation: For cohesive subgrades, a padfoot vibratory compactor is typically the most efficient. Its feet penetrate and knead the soil, compacting from the bottom up, ideal for breaking down cohesive clumps in a 150 mm lift.
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