Question

Identify the roller best suitable for compaction of cohesionless soils.

• A. Sheep Foot Roller
• B. Grid roller
• C. Vibratory Roller
• D. Smooth steel roller

Hint:

Remember: \[ \boxed{ \begin{aligned} \text{Clay} &\rightarrow \text{Sheep foot roller} \text{Sand/Gravel} &\rightarrow \text{Vibratory roller} \end{aligned} } \]

Answer 1

The Correct Option is C

Concept: The effectiveness of a roller depends upon the type of soil being compacted. Cohesionless soils such as sand and gravel are best compacted by vibration, which rearranges the soil particles into a denser configuration.

Step 1: Understand the suitability of different rollers.
• Sheep foot roller $\rightarrow$ Best for cohesive soils (clay).
• Grid roller $\rightarrow$ Coarse-grained soils with weathered rocks.
• Smooth steel roller $\rightarrow$ Finishing and surface compaction.
• Vibratory roller $\rightarrow$ Best for cohesionless soils.

Step 2: Identify the correct roller. Since vibration is highly effective for sands and gravels, \[ \boxed{\text{Vibratory roller is most suitable for cohesionless soils}.} \] Therefore, the correct option is \[ \boxed{(C)\;\text{Vibratory Roller}.} \]