khaliqur rahman IIMT ENGINEERING COLLEGE

1. A SEMINAR TOPIC ON
Submited to:- Dr. TARA CHAND
DESIGN RECRUIREMENT OF
CONCRETE SLAB
Presented by:- KHALIQUR RAHMAN
Roll No. 1512700019
IIMT ENGINEERING COLLEGE

2. I would like to express my special thanks of
gratitude to my teacher DR. TARA CHAND.
who gave me the golden opportunity to do
this wonderful seminar on the topic DESIGN
RECRUITMENT OF CONCRETE SLAB, which
also helped me in doing a lot of Research and
i came to know about so many new things I
am really thankful to him.
acknowledgement

3. CONTENT
Introduction
Function
Classification of slab
Design consideration
Reinforcsd concrete slab
Slab design
Types of slab problem

4. Introduction
What is Slab???
“A flat piece of concrete, typically used as a
walking surface, but may also serve as a load
bearing device as in slab homes.”

5. FUNCTION
 Provide a flat surface
 To support load
 Sound, heat and fire insulator
 Act as a divider (privacy) for the occupants
 Upper slab became the ceiling for the
storey below
 Space between slab and ceiling can be used
to place building facilities

6. Classification of Slab

7. DESIGN CONSIDERATION
Among the design function that need to be
taken
in consideration for construction of ground
floor
slab is
• The provision of a uniform, level surface
• Sufficient strength and stability
• Exclusion of dampness from inside of
building
• Thermal insulation (max.0.45 W/square
metreK
• Resistance to fire

8. Solid Floor / Non Suspended Floor
Constructed using concrete
Doesn’t use timber so there will be no
decay
Solid floor need other finishing

9. Construction Of Solid Floor
1) Clear the construction area
2) Remove topsoil / unsuitable material (225 mm)
3) Compact and level the soil
4) Place hardcore and compact it
Hardcore plays the role to fill in any small pockets
that have formed during oversite excavation in
order to provide a firm base for placing concrete
bed and to help spread any point loads over a
greater area.
5) Place Damp Proof Membrane
6) Prepare formwork

10. 7) Prepare lean concrete (50 – 75mm) in order
to ensure the reinforcement didn’t touch
the ground.
8) Place Reinforcement Bar to increase
strength
9) Pour concrete (1:2:4) with thickness of
(150mm) and level it.
10)Place concrete of (25-50mm ) thickness .
(rendering process)

11. Reinforced Concrete Slab / Floor
In- Situ construction
Flat Slab
Flat Plate Slab
Waffle Slab / Honeycomb Floors
Beam Floor Slab

12. Flate plate slab

13. FLAT PLATE SYSTEM
Simple construction
Flat plate construction can minimize storey
height (piping, wall cladding, elevators etc)
in areas with absolute height restrictions.
Low storey heights due to shallow floor
Spans < 20ft (residential & light commercial)
Flat ceilings (reduced finishing cost)
Have the simplest formwork
Least labor costs
Can be applied for short to medium spans
with light loadings
Also reduce building weight and effective
area of wind loads

14. FLAT SLAB
Reduce slab displacement
Increased slab shear resistance
This system provide relatively a flat ceilings
(reduce finishing cost)
Low storey heights due to shallow floor
Medium span with light loading
Spans 20 to 40 ft
Live load > 100psf (garage, warehouses

15. SLAB DESIGN
One Way Slab
Two Way Slab
- Require less steel
- Few two slabs built in the area of high
labor costs
- Suitable for minimizing deflections

16. One Way Slab and two way

19. CRACKING OF THE SLAB : CAUSES
Poor construction techniques and practices
Differential / Uneven settlement
Inadequate structural strength of concrete
Improper placement of reinforcing & mesh

20. Cracking Of The Slab

21. Damp or Wet Floor Slab : Causes
Moisture migration through the slab
Poor site drainage

22. Life Is Very Short So Make It Meaningful