Engineers are always looking for excellence in construction. But they have to follow some basics before
starting the mega project.
The site engineers generally concentrate much on those issues:
· Bars which have
the diameter more than 36 mm should avoid lapping.
· The maximum chair
spacing is 1.00 m (or) 1 No per 1m2.
· Minimum 12 mm
diameter needed for dowel rod.
· 12 mm diameter
bar should be used in chair.
· The longitudinal
reinforcement should follow the range between 0.8 – 6 per cent of gross CS.
· For circular
column, bars would be 4 Nos and 6 Nos.
· Slabs are
important in any construction. The main bar slab (8 mm HYSD) or 10mm (plane
bar), distributor should not be less than 8 mm and more than 1/8th of slab’s
thickness.
· 125 mm is
minimum slab thickness.
· Concrete free
fall maximum maximum 1.50 m.
· Remember lap
slice should not be used in the bar larger than 36 mm.
· Brick water
absorption should not be 15 per cent.
· PH value of
water has to be 6.
· Brick
compressive strength 3.5 N / mm2.
· 8 kg per MT is
the measurement of steel reinforcement binding wire.
· Samples for ore
cutting test in the soils filling for every 100m2.
Density of Materials:
Bricks: 1600 – 1920 kg/m3
Concrete block: 1920 kg/ m3
Reinforced concrete: 2310 – 2700 kg/ m3
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
|
Curing time of RCC Members for different types of cement - Super Sulphate
cement: 7 days, Ordinary Portland cement OPC: 10 days and Minerals &
Admixture added cement: 14 days.
