https://civiltech-p.blogspot.com/2021/05/whatisslabandtypeofslab.html The article is related to what is the slab? And the different types of slab in construction. Different Types of Concrete Slabs in Construction 1. Flat Slab 2. Flat Plates 3.Conventional Slab( I. One Way Slab II.Two Way Slab) 4. Hallow Core Slab 5. Hardy Slab 6. Dome Slab 7. Pitch Roof Slab 8. Slab With Arches 9. Post Tension Slab 10. Pre-Tension Slab 11. Cable Suspension Slab 12. Low Roof Slab 13. Projected Slab 14. Grad Slab / Slab On Grade ( I. Slab On Ground II. Stiffened Raft Slab III. Waffle Raft Slab 15. Bubble Deck Slab 16. Composite Slab 17. Sunken Slab

2.  The article is related to what is the slab? And what are
the different types of slab in construction? Slab is the
important component of structure. The Slab provides
roof to the structure which provide comfort to user.

3.  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.

4.  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 Some are outdated and some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. Hardy Slab
6. Dome Slab
7. Pitch Roof Slab

5. 8. Slab With Arches
9. Post Tension Slab
10. Pre-Tension Slab
11. Cable Suspension Slab
12. Low Roof Slab
13. Projected Slab
14. Grad Slab / Slab On Grade
i) Slab On Ground ii) Stiffened Raft Slab iii) Waffle Raft Slab
15. Bubble Deck Slab
16. Composite Slab
17. Sunken Slab

6.  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.

8.  The Flat Plates can be constructed as one-way as well
as two ways.
 The slab is supported by walls and columns.
 The flat plates are easy to construct, and they need
less or simple formwork.
 The construction process of the flat is very fast.

9.  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 slabs require more formwork as compare to flat
slab.
 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

10.  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.

11.  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.

12.  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.  Hardy Slabs are made up from hardy bricks of size 40cm x
20cm x 20cm, which are hallow bricks consist of hollow
concrete blocks. .
 The use of hallow bricks reduce the self weight of slabs.
 The thickness of the hardy slab is 270mm which is greater
than the conventional slab.
 The construction of the hardy slab is suitable at such
locations like Dubai, China, etc. where temperature is
higher because they are good heat insulators.

14.  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.

15.  The Pitch Roof is constructed for aesthetics view to
look pleasant and natural.
 They are inclined slabs, in which tiles sheets are used
as roofing material which are lightweight.

16.  The Slab with Arches are mostly constructed at
bridges.
 They were constructed by stone or bricks, but
nowadays they are constructed by reinforced concrete
or steel.
 For redirecting wind loads the arch slab is adopted.

17.  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.

18.  The Pre-Tension Slab is tensioned before placing the
slab.
 In this slabs cables or steel tendons are used in spite of
reinforcement.

19.  The Cable Suspension Slab is used where the span of
slab is very longer and difficult to build columns, then
such pan is supported by the cables. for examples
Howrah bridge, London bridge, etc.
 At every 500 m distance, a column is provided.
 The slabs are tied with the cables and these cables re
joined to the columns.

20.  Low Roof Slab is provided above the door for storage
purpose.
 This slab is used specially in houses which are in
between the actual slab and above the door sill level.
 The slab is open at one end and closed at all ends.

21.  The Projected Slab is fixed at one side and free at
other sides.
 Projected slab also called s cantilever slab.
 The projected slab is mostly constructed at hotels,
function halls, etc.
 The space below the projected slab is used for
dropping or picking up zone and as loading or
unloading area.

22.  The slab which is constructed on ground is called grad
slab or slab on grad. It is again divided into three types
as follows,
I. Slab On Ground
II. Stiffened Raft Slab
III. Waffle Raft Slab

23.  The slab is constructed on ground surface with stiffing
beams which are constructed around the perimeter of
slab.
 The slab is only suitable t the ground surface with sand
and rock. The thickness of slab is 100mm.

24.  The Stiffened Raft Slab is like slab on ground or
ground slab but difference is that beams are set
through the middle of slab in the channels.

25.  The Waffle Raft Slab is constructed above the ground
by using polystyrene blocks.
 First of all polystyrene blocks are placed on ground
and then concrete is poured on the surface.
 If the ground is very flat then the waffle raft slab is the
choice, which is easy to construct and cheaper also.

26.  For the construction of Bubble Deck Slab
prefabricated plastic bubbles are used at the place of
ineffective concrete at the centre of slab.
 The plastic bubbles are prefabricated and then
reinforcement placed. Lastly concrete is poured over
the plastic bubbles.
 Bubble deck slab reduce the self weight of slab and
increase strength.
 It reduces the cost of construction and it is
environmental friendly.

28.  The composite slab is the combination of reinforced
slab and steel decking means the reinforced concrete
cast on top of the profiled steel decking.
 During construction period steel decking act as
formwork and working area, and in service life of
slab, it acts as external reinforcement.
 The slab is made up of concrete to reduce floor’s
deflections and vibrations. Also concrete is fire
resistive.

30.  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