ESTIMATION, COSTING &

SPECIFICATIONS

SUBMITTED BY11613,11627, 11644, 10610,11634,

11640

REPORT ON

ROOF

SPECIFICATIONS

SPECIFICATIONS FOR THE RCC

SLABS (1:2:4)

Proportions-

The proportions of cement concrete shall

be of one part of cement, two parts of sand

and four parts of aggregates by volume.

Cement-

The cement to be used in this work should

comply with the standard requirements.

Fine Aggregate-

Sand to be used in this work shall be clean and coarse and shall be free from the any

organic or vegetable matter.

The sand shall be washed, if there is any

trace of earth.

Water- The water to be used in concrete work

shall be clean ad fresh.

RCC FLOOR

REINFORCEMENT The steel reinforcement used in

RCC construction are of two types:

Mild steel & (2) Tor steel i.e. High

Yield Strength Deformed (HYSD)

steel.

In conventional RCC works, the

mild steel has been replaced by

the Tor steel bars except 6 mm.

diameter bars. The proportions of

cement concrete for the slab is

(1:2:4) i.e. M15.

All bars shall be placed as per the

design by the structural engineer

and utmost care shall be taken to

keep them in the same position

while packing concrete around

them.

Centering

The centering for the concrete

work shall be sufficiently strong

and rigid and in good

condition so as to turn out a

good smooth surface.

The formwork shall include all

forms of temporary and

permanent nature required to

be used during casting of

concrete.

The material for formwork shall

be of timber or steel plates or

plywood planks or any other

suitable material as approved

by the engineer.

The props to be used for

centering shall be of timber

having spacing less than 1.2m.

Mixing of Concrete-

The mixing of concrete shall be

done in a mechanical mixer or

by hand operations depending

upon the quantity of the

concrete which shall be

decided by the engineer.

For mechanical mixer, the mixing

drum shall be turned at least for

1.50 minutes after all the

ingredients are added and the

drum shall be completely

emptied every time.

For hand mixing the, the dry

concrete shall be mixed at least

three times and then required

quantity of water shall be added

to it and this work should be done

on the water tight platform.

Laying of Concrete-

Before starting laying of

concrete in position , the

concrete shall be well-watered.

The concrete shall be laid in

forms and tapped in such a way

that no honeycomb surface

appears on the removal of

forms.

All edges and corners of the

concrete surface shall remain

unbroken, sharp and straight in

line. The cement concrete work

shall be kept well-watered for at

least 20 days.

Finishing of Exposed surface-

All exposed surfaces of the

concrete work shall be finished with

12 mm. thick cement plaster of

sagol finish and three coats of

white or colour wash shall be

applied on these exposed surfaces

of concrete.

The items of plaster and white or

colour wash shall be carried out as

per specifications of the

corresponding items contained in

this document.

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