YOUR QUERIES…..Solved !

Dear Friends ,

Good evening !

Today , let us solve your queries.

1

Q.No 43 :

2

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 :

32-3
FORM WORK FOR COLUMN IS BEING PREPARED USING A 8′ LONG MARINE PLY 12 MM THICK 
32-4
LIFT OF COLUMN IS 8′

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 :

OHWT :

Yeah it means OVER HEAD WATER TANK.

1

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