Points to Remember for Civil Site Engineer
Following are few general points to
remember for civil site engineers to make the construction work easier while
maintaining quality of construction.
o Lapping
is not allowed for the bars having diameters more than 36 mm.
o Chair
spacing maximum spacing is 1.00 m (or) 1 No per 1m2.
o For
dowels rod minimum of 12 mm diameter should be used.
o Chairs
minimum of 12 mm diameter bars to be used.
o Longitudinal
reinforcement not less than 0.8% and more than 6% of gross C/S.
o Minimum
bars for square column is 4 No’s and 6 No’s for circular column.
o Main
bars in the slabs shall not be less than 8 mm (HYSD) or 10 mm (Plain bars) and
the distributors not less than 8 mm and not more than 1/8 of slab thickness.
o Minimum
thickness of slab is 125 mm.
o Dimension
tolerance for cubes + 2 mm.
o Free
fall of concrete is allowed maximum to 1.50m.
o Lap
slices not be used for bar larger than 36 mm.
o Water
absorption of bricks should not be more than 15 %.
o PH
value of the water should not be less than 6.
o Compressive
strength of Bricks is 3.5 N / mm2.
o In
steel reinforcement binding wire required is 8 kg per MT.
o In
soil filling as per IS code, 3 samples should be taken for core cutting test
for every 100m2.
Density of Materials
|
Material
|
Density
|
|
Bricks
|
1600 – 1920 kg/m3
|
|
Concrete block
|
1920 kg/ m3
|
|
Reinforced concrete
|
2310 – 2700 kg/ m3
|
Curing time of RCC Members for
different types of cement
Super
Sulphate cement: 7 days
Ordinary
Portland cement OPC: 10 days
Minerals
& Admixture added cement: 14 days
De-Shuttering time of different
RCC Members
|
RCC Member
|
De-shuttering time
|
|
For columns, walls,
vertical form works
|
16-24 hrs.
|
|
Soffit formwork to
slabs
|
3 days (props to be
refixed after removal)
|
|
Soffit to beams
props
|
7 days (props to
refixed after removal)
|
|
Beams spanning upto
4.5m
|
7 days
|
|
Beams spanning over
4.5m
|
14 days
|
|
Arches spanning up
to 6m
|
14 days
|
|
Arches spanning over
6m
|
21 days
|
Cube samples required for
different quantity of concrete
|
Quantity of Concrete
|
No. of cubes required
|
|
1 – 5 m3
|
1 No’s
|
|
6 0 15 m3
|
2 No’s
|
|
16 – 30 m3
|
3 No’s
|
|
31 – 50 m3
|
4 No’s
|
|
Above 50 m3
|
4 + 1 No’s of
addition of each 50 m3
|
Comments
Post a Comment