10. Calculation process
Effective depth of slab= span/depth.
Example:
fcu=25 N/mm^2
fy=250 N/mm^2
1 m wide strips of 3 m clear span
effective depth must not less than =
3000/20*1.5=100mm
depth modification factor=1.5
Overall depth of slab=100+cover of
20+6*(1/2 bar dia)=126( ~130 mm)
12. Shuttering
•It is the term used for
temporary timber
plywood metal or other
material used to
provide support to wet
concrete mix till it gets
strength for self support
to slab.
Day-3
13. Reinforcement in Slab
Slab
reinforcement
includes straight
bar , cranked bar
Extra tops near
the supports
Mainly 1.5 " clear
cover is
maintained
CC blocks are
used
Clear cover
14. Provide reinforcement
•First of all a steel grid is made of distribution steel and main steel.
•From which, main steel is shorter member and distribution steel
is larger one.
•Main steel: in one way slab main reinforcement is parallel to longer
and the reinforcement parallel to shorter is known as main steel.
• Distribution steel: in one way slab main reinforcement is parallel
to shorter and the reinforcement parallel to longer is known as
distribution steel.
•The diameter
of bar generally
used in slabs
are: 6 mm, 8
mm, 10 mm,
12 mm and
16 mm.
Distribution steel
Main steel
Day-4
16. After reinforcement the slab gains the
thickness of 15 cm. the thickness of slab is
decided as per IS codes.
Generally 15 mm to 20 mm cover is provided
for the main reinforcements.
Day-5
Concreting
