Heavy Equipment Operator Certification Exam Prep · Question
A heavy equipment operator is compacting an asphalt pavement layer with a vibratory smooth drum compactor. The lift thickness is 50 mm. Which vibratory setting is most appropriate to avoid aggregate fracturing and achieve good surface finish?
For thin lifts of asphalt, low amplitude and high frequency are typically used to densify the material without causing aggregate fracturing, providing a smoothe
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Question: A heavy equipment operator is compacting an asphalt pavement layer with a vibratory smooth drum compactor. The lift thickness is 50 mm. Which vibratory setting is most appropriate to avoid aggregate fracturing and achieve good surface finish?
Answer options:
- High amplitude, low frequency
- Medium amplitude, medium frequency ✅ Low amplitude, high frequency
- No vibration, static compaction only
Correct answer: Low amplitude, high frequency
Explanation: For thin lifts of asphalt, low amplitude and high frequency are typically used to densify the material without causing aggregate fracturing, providing a smoother finish, and preventing corrugation.
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