Building Construction
During percussion drilling

The soil to a considerable depth below the bottom of the hole gets disturbed
Caving or mixing of strata are caused in soft soils or cohesion-less soils
Ground water observations are hindered due to entry of the slurry in the soil below the bottom of the hole
All listed here

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Building Construction
Slate

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

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