Building Construction
Gravels

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

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Building Construction
Negative skin friction

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

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