Building Construction
Depth of lean concrete bed placed at the bottom of a wall footing, is kept

Equal to its projection beyond wall base
15 cm
Less than its projection beyond wall base
10 cm

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Building Construction
Gravels

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

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Building Construction
Slate

Splits into thin sheets along its bedding planes
Has a smooth surface and contains alumina and silica
Is a metamorphic rock
Possesses good water absorption capacity

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