In this presentation you we let you know one structural member that is slab and it's types

1. Slab
And Its Types
Presented by
Mohammed Aziz Uddin
160923741026
M.E - Structures
Under the Guidance of
Mr.Venkatesh
Assistant Professor
Lords Institute of Engineering and Technology
Department of Civil Engineering

2. Defination
Slab –
• The Slab is the horizontal structural member which is used to
form floors, roof decks and ceilings.
• It is made up of concrete or reinforced cement concrete.
• The slab is working as roof when placed at the top of the
structure, the roof or the slab is supported by columns, beams
and walls.
• Usually, reinforced concrete slab and beam cast monolithically
in the structure.

3. Introduction
What is Slab?
• Slab is a thin concreted flat structure mostly used for flooring purpose.
• It can be square, rectangular, circular in shape.
• Slabs can be used in making floors, ceilings and some sometimes paving too.
• Thickness of a slab varies from 4 to 6 inches.
• 4 inches thick slab will be used where there is light load on the floor (dead and live)
• Whereas 6 inches thick slab is used where there is quite heavy load on the floor
• Slabs are mostly known as RCC slabs that means Reinforcement Cement and
Concrete Slabs.
• Materials which are used to make RCC slabs are: Cement, Course aggregate, fine
aggregates and reinforcement bars.

4. Types of Slabs
There are different types of concrete slab which are used in
construction. Some are outdated and some are used nowadays.
We are discussing in detail as follows,
• 1. Flat Slab
• 2. Flat Plates
• 3. Conventional Slab
i)One Way Slab ii)Two Way Slab
• 4. Hallow Core Slab
• 5. Sunken Slab
• 6. Dome Slab
• 7. Pitch Roof Slab
• 8. Slab With Arches
• 9. Post Tension Slab
• 10. Pre-Tension Slab

5. Flat Slab
 Flat Slab is the simplest type of slab use in
construction of slab, in which slab is constructed
on column or column cap without the use of beam.
 This slab is easy to construct it is economical
because it requires less formwork.
 Due to absence of beam the slab also called as
beam less plate.
 The thickness of slab is more than other type of
slab.
 The floor to floor height is minimized by the slab
construction, which makes structure’s view
pleasant.
 The flat slab specially used at the location where
no need of beam for making pleasant look of
structure such as restaurant, hall, business houses,
parking deck, etc.

6. Conventional Slab
 The Conventional Slab is placed on beams and
columns.
 The thickness of the conventional slab is small
i.e. 4” or 10 cm.
 In conventional slab beam and column carry
and transferred load to the foundation so the
depth of beam is large.
 The conventional slab consist of reinforcement,
the bars which are placed horizontal in slab is
called main reinforcement bars and the bars
which are placed vertical in slab is called
distribution bars.
 According to length and width of the
conventional slab, it again divided into two
types as follows,
1. One Way Slab 2. Two Way Slab

7. 1.One Way Slab
One Way Slabs carry load along
one direction which is supported
by beam on two opposite sides.
 The condition for one way slab is
the ratio of longer span to shorter
span of slab should be equal to and
greater than 2.
The main bars are placed along the
shorter direction, and distribution
bars are placed along longer
direction and they are cranked to
resist formation of stresses in slab.

8. 1.Two Way Slab
 Two-Way Slabs carry load along both
direction and is supported by beams on
all four sides.
 The condition for two-way slab is the
ratio of longer span to shorter span of
slab should be less than 2.
 The Distribution bars are provided in
both directions, so the bars are cranked
in both directions.
 The two-way slab requires more
formworks.
 The slab is used for multistory
buildings.

9. Sunken Slab
 The Sunken Slab is the slab which is provided
below the washrooms to hide sewerage pipes
or sewage pipes.
 The pipes which carry water are hidden below
the floor. The floor is filled with coal or broken
pieces of bricks, after casting the pipes.
 There are two types of sunken slab as follows,
 The slab which provide above normal floor
level t height of 0.2m to 0.3m and the space is
filled with the coal and broken pieces of
bricks.
 The slab which provide below normal floor
level t height of 0.2m to 0.3m and the space is
filled with the coal and broken pieces of bricks

10. Dome Slab
Dome Slab is built on the
conventional slab which is semi-
circular in shape and mostly used in
temples, palace, mosques, etc.
 Thickness of the slab is 150mm,
which is a concrete slab.

11. Post Tension Slab
The Post Tension Slab is tensioned
after constructing a slab.
To resist compression in slab,
reinforcement is provided but in
post tension slab cables or steel
tendons are used.
Post tension slab provide better
structures with affordable price.

12. Hallow Core Slab
 Hallow Core Slab is the precast slab
with cores or voids.
 The slabs require less concrete so the
self weight of the slab is less.
 The voids or cores act like service
ducts, like plumbing and electricity.
 The slab is casted where the fast
constructions are required.
 With reducing the weight of structure,
it reduces the cost of structure.
 It is suitable for car parking, multistory
buildings, etc.

13. Queries