Soil Compaction

A soil has a wet unit weight of 19 kN/m3 and water content 5%. The dry unit weight of soil is……....

• 3.80 kN/m3
• 18.10 kN/m3
• 19.95 kN/m3
• 95.00 kN/m3

Coarse-grained soils are best compacted by a ………….

• sheepsfoot roller
• smooth-wheel roller
• rubber-tired roller
• vibratory roller

The phase of compaction in which soil particles absorb water to saturate particles + provide minor lubrication that increases dry unit weight is called ………….

• saturation
• swelling
• hydration
• lubrication

For the same compaction energy, ……….. has the highest value of O.M.C.

• clay
• sand
• silt
• gravel

With the increase in the amount of compaction energy……….

• optimum water content increases but maximum dry unit weight decreases
• both optimum water content and maximum dry unit weight increase
• optimum water content decreases but maximum dry unit weight increases
• both optimum water content and maximum dry unit weight decrease

Sand cone test can be used to measure .........…….

• maximum dry unit weight in field
• dry unit weight in laboratory
• maximum dry unit weight in laboratory
• dry unit weight in field