Heavy Equipment Operator Certification Exam Prep · Question
A contractor needs to achieve high-density compaction for a granular sub-base layer that is 450 mm thick. Which compactor type is typically best suited for this application, particularly when deep penetration is required?
Smooth drum vibratory compactors are highly effective for granular materials, especially for thicker lifts (450 mm is substantial) where the vibratory action he
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Question: A contractor needs to achieve high-density compaction for a granular sub-base layer that is 450 mm thick. Which compactor type is typically best suited for this application, particularly when deep penetration is required?
Answer options:
- Pneumatic tire roller ✅ Smooth drum vibratory compactor
- Tandem vibratory roller
- Static steel wheel roller
Correct answer: Smooth drum vibratory compactor
Explanation: Smooth drum vibratory compactors are highly effective for granular materials, especially for thicker lifts (450 mm is substantial) where the vibratory action helps achieve deep compaction and densification.
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