Building Construction
The depth of concrete bed of the foundation depends upon

The upward soil pressure
The mix of the concrete
All listed here
The projection of the concrete block beyond the footing over it

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Building Construction
For constructing a terrazzo floor, Pick up the incorrect statement from the following:

A base course is prepared as in cement concrete flooring
Glass strips are driven into the layer according to the pattern required
A 32 mm thick layer of cement concrete (1 : 2 : 4) is laid on the base course and the surface is made smooth by trowelling
After final grinding is over, oxalic acid mixed with water is spread over and rubbed hard with soft material

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Building Construction
Rotary drilling

Is not suitable for deposits containing very coarse gravel
All listed here
Is not economical for holes of less than 10 cm
Hinders the ground water observations and permeability test

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