A double drum vibratory compactor is typically used to compact which materials?

A double drum vibratory compactor is typically used to compact which materials?

• A. Concrete
• B. Cohesionless sub grade, base courses, wearing surfaces, and asphalt
• C. Clay and silt
• D. Wet sand

Answer: (B)

A double drum vibratory compactor works by using vibration and weight to densify granular materials. It’s most effective on cohesionless soils and asphalt, where the particles are non-cohesive and can rearrange into a tighter, denser packing under vibration. That’s why it’s typically used for cohesionless subgrade, base courses, wearing surfaces, and asphalt. Clay and silt are cohesive soils; they don’t respond to vibration in the same way and often require kneading action or different equipment to achieve proper compaction. Concrete isn’t compacted with a roller at all, since it’s placed and cured rather than compacted like soils or asphalt. Wet sand can also behave poorly under vibration if moisture conditions aren’t right, so it isn’t the typical use for this machine.

A double drum vibratory compactor works by using vibration and weight to densify granular materials. It’s most effective on cohesionless soils and asphalt, where the particles are non-cohesive and can rearrange into a tighter, denser packing under vibration. That’s why it’s typically used for cohesionless subgrade, base courses, wearing surfaces, and asphalt.

Clay and silt are cohesive soils; they don’t respond to vibration in the same way and often require kneading action or different equipment to achieve proper compaction. Concrete isn’t compacted with a roller at all, since it’s placed and cured rather than compacted like soils or asphalt. Wet sand can also behave poorly under vibration if moisture conditions aren’t right, so it isn’t the typical use for this machine.