Compaction MCQ with answer and solution

Concept

Compaction of Cohesive Soils

Formula

No

Step-by-step solution

- Identify cohesive soils as fine-grained soil requiring high pressure and kneading action - Evaluate roller types: sheep foot rollers offer kneading action suitable for cohesive soils - Choose option c (sheep foot rollers)

Explanation

Sheep foot rollers have raised projections that apply high pressure and a deep kneading action, which effectively squeezes out air and compacts sticky, fine-grained cohesive soils like clay from the bottom up.

Shortcut

Remember "C & C": Cohesive soil is Clay, and Clay needs Kneading from Sheep Foot Rollers.

Common mistake

Many students mistakenly choose vibratory rollers because they are widely used in general construction, forgetting that vibratory compaction is effective mainly for cohesionless/granular soils, whereas sheep foot rollers are required for cohesive clayey soils.