Which type of roller is most suitable for compacting cohesive soils?

Question

Question

This question was previously asked in

RRB JE CE 22 Apr 2025 Shift 2 CBT 2 Official Paper

Answer 1

Explanation:

Sheep foot roller:

This type of roller is most suitable for compacting cohesive soils such as clay or silty soils.
The protruding "feet" help to knead and compress the soil, which is particularly effective for cohesive materials that tend to stick together and require more pressure for proper compaction.

Additional Information

Vibratory roller: Best suited for granular soils (such as sand and gravel) where vibration helps to reduce air gaps and improve compaction. It is not as effective for cohesive soils.
Smooth wheel roller: Works well for compacting fine-grained soils (sand or gravel) on the surface but lacks the necessary force for effective compaction of cohesive soils.
Pneumatic roller: Has rubber tires that apply pressure and are suitable for compacting granular soils or mixtures. It is not as effective for cohesive soils as the sheep foot roller, which provides more kneading action.