Building Construction
Slate

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

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Building Construction
Grillage foundation

Does not require deep cutting as the required base area with required pressure intensity is obtained at a shallow depth
Is used to transfer heavy structural loads from steel columns to a soil having low bearing capacity
All listed here
Is light and economical

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