Building Construction
Gravels

Never swell when they come into contact with water
All listed here
Are cohesionless aggregates
Vary in size between 2 to 20 mm

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Building Construction
Negative skin friction

Is a downward drag acting on a pile due to downward movement of the surrounding compressible soil relative to the pile
Both (A) and (B)
Neither (A) not (B)
Develops due to lowering of ground water

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