What is slab?
a large, thick, flat piece of stone or
concrete, typically square or rectangular
construction stages of slab
• Construction of beam
• Steel grid
1) main steel
2) distribution steel
•It helps to
either two or
beam is basic
necessity of slab.
Construction of beam
•The temporary support provided to the formwork for supporting
components parts of slab is called centering
Effective depth of slab= span/depth.
1 m wide strips of 3 m clear span
effective depth must not less than =
depth modification factor=1.5
Overall depth of slab=100+cover of
20+6*(1/2 bar dia)=126( ~130 mm)
•It is the term used for
plywood metal or other
material used to
provide support to wet
concrete mix till it gets
strength for self support
Reinforcement in Slab
bar , cranked bar
Extra tops near
Mainly 1.5 " clear
CC blocks are
•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
of bar generally
used in slabs
are: 6 mm, 8
mm, 10 mm,
12 mm and
Type of slab
Main steel Dis. steel
115th 8mm dai. 8mm dai. M-35 2 way
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.
Curing and Removal of
Curing : It is
done for 21 days
Final curing shall be done by ponding and
stacking water for minimum period of 7