Which of the following pairs are correctly matched regarding the compaction equipment used for different soil types?One or more than one option can be right.a)Smooth wheeled rollers - Fine-grained soilsb)Sheepsfoot rollers - Cohesive soilsc)Vibratory rollers - Cohesionless soilsd)Pneumatic rollers - All soil typesCorrect answer is option 'B, C, D'. Can you explain this answer?

Question

Answer

Smooth wheel rollers are ideal for gravel, sand.

Answer

Compaction equipment is used in construction projects to increase the density and stability of soil. Different types of soil require different compaction equipment to achieve the desired compaction results. The correctly matched pairs of compaction equipment and soil types are as follows:

b) Sheepsfoot rollers - Cohesive soils:
Sheepsfoot rollers are heavy-duty compactors that are effective for compacting cohesive soils. Cohesive soils have a high clay content and tend to stick together. Sheepsfoot rollers have cylindrical or hexagonal drum-shaped wheels with protruding feet or pads. These feet create deep impressions in the soil, effectively kneading and compacting the cohesive soil.

c) Vibratory rollers - Cohesionless soils:
Vibratory rollers are used for compacting cohesionless soils, which include sands and gravels. Cohesionless soils have little to no clay content and do not stick together. Vibratory rollers have large steel drums that vibrate rapidly, causing the soil particles to rearrange and settle into a denser configuration. The vibrations help in achieving better compaction in cohesionless soils.

d) Pneumatic rollers - All soil types:
Pneumatic rollers are versatile compaction equipment that can be used for all soil types. They are particularly effective for compacting granular soils, such as sands and gravels. Pneumatic rollers have rubber tires filled with air, which allows them to exert pressure evenly over a larger area. This helps in achieving uniform compaction and reduces the risk of over-compaction, especially in cohesive soils.

a) Smooth wheeled rollers - Fine-grained soils:
Smooth wheeled rollers are not typically used for compacting fine-grained soils, which include silts and clays. Fine-grained soils have small particle sizes and tend to stick together. Smooth wheeled rollers do not provide enough compaction force to effectively compact these soils. Instead, specialized equipment like sheepsfoot rollers or vibratory rollers are more suitable for compacting fine-grained soils.

In summary, sheepsfoot rollers are correctly matched with cohesive soils, vibratory rollers are correctly matched with cohesionless soils, and pneumatic rollers can be used for all soil types. Smooth wheeled rollers, on the other hand, are not suitable for compacting fine-grained soils.

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