Points That Site Engineer Should Remember
Points That Site
Engineer Should Remember
Following
are few general points to remember for civil site engineers to make the
construction work easier while maintaining quality of construction.
·
Lapping is not allowed for the bars having
diameters more than 36 mm.
·
Chair spacing maximum spacing is 1.00 m (or) 1
No per 1m2.
·
For dowels rod minimum of 12 mm diameter should
be used.
·
Chairs minimum of 12 mm diameter bars to be
used.
·
Longitudinal reinforcement not less than 0.8%
and more than 6% of gross C/S.
·
Minimum bars for square column is 4 No’s and 6
No’s for circular column.
·
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.
·
Minimum thickness of slab is 125 mm.
·
Dimension tolerance for cubes + 2 mm.
·
Free fall of concrete is allowed maximum to
1.50m.
·
Lap slices not be used for bar larger than 36
mm.
·
Water absorption of bricks should not be more
than 15 %.
·
PH value of the water should not be less than 6.
·
Compressive strength of Bricks is 3.5 N / mm2.
·
In steel reinforcement binding wire required is
8 kg per MT.
·
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
|
About Author:
I am Thomas Britto here to share my experiences in the civil engineering field to all my readers.Today many students are struggling to buy books at high prices. So I decided to start a blog and share my experience and knowledge with all my readers.
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