Dear Friends ,
Good evening !
Today , let us solve your queries.
Q.No 43 :
The basic idea is like this .
The Water proof [ Marine ] ply which is used for the Form work of the column comes in the sizes of 3’*7′ or 3’*7′ or 3’*8′ and 4’*8′.
Thus the maximum height of the column [ Known as lift ] cannot be more than 8′.
Look at the pictures :
Whereas when it is said that concreting should not be done from a height more than 1.5 m , it is meant that the free fall of concrete shall not be more than 1.5 m. if concrete is poured for a height greater than this , then there shall be segregation .
Point no 07 :
Density of plain cement concrete is considered as 2400 Kg / Cum.
If we assume that the weight of Rebars per cum of concrete is 100 Kg /cum , then the density of RCC shall be exactly 2500 Kg/Cum.
However, the Rebar weight could vary from 70 Kg/Cum in footings to 150 Kg/cum for Beams. This Rebar weight shall depend on many factors such as type of construction ,design philosophy adapted etc.
Therefore , it is a good practice to start at PCC = 2400 Kg/cum.
Point No 28 :
Yeah it means OVER HEAD WATER TANK.