This document provides details on the construction of a mat foundation. It describes the key steps including shoring, soil excavation, reinforcement placement, concrete casting, and curing. Advantages of mat foundations include reducing differential settlement and providing a stable base for poor soil conditions or where a basement is needed. Disadvantages include higher costs than other foundation types and potential issues with heat and water. The document appears to be a student presentation summarizing their site visit observations of mat foundation construction procedures.

1. CE 200
DETAILS OF CONSTRUCTION
PRESENTATION ON MAT FOUNDATION
Submitted By:-
Group-02, Section-B1, 2nd
Year, 2nd
Semester,
Department Of Civil Engineering

2.  Towhidur Rahman Tasin ID NO.16-02-03-088
 Faria Sultana ID NO.16-02-03-085
 Ashik Azad Nibir ID NO.16-02-03-086
 Ashiqur Rahman Prottoy ID NO.16-02-03-087
 Soumik Paul ID NO.16-02-03-089
Contributed By

3. What Is Foundation?

4. Types Of Foundation
Foundation
Shallow Deep
Strip
Individua
l Mat CofferdamCaissonPile

5.  A continuous, thick, concrete slab foundation heavily
reinforced with steel supporting an entire structure.
 It is a type of shallow foundation (depth ≤ width).
 All the columns are connected to an large RCC slab
and the slab has direct contact with the soil.
 Mainly constructed at a depth of 1-20 feet from
ground level.
Mat Foundation

6.  When foundation area cover 50% -60% of the total plot area
because of large column loads.
 The soil is soft with a low bearing capacity.
 When the expenses of deep foundation is higher then raft
foundation.
 When basement is needed
Reasons For Mat Foundation

7. Visited Site
110/A Tejgaon- Gulshan link
Road,Tejgaon,Dhaka
Road & Highway Department,
Sarak
Bhaban,Tejgaon, Dhaka-1208
Plot No.-33, Road No-15, Sector- 03,
Rabindra Sarani, Uttara, Dhaka
Airport Village,Civil Aviation plot,
Airport Road ,Kurmitola, Dhaka.

8. Procedure Flow Chart
Shoring
Soil
Excavation
Leveling&
Compaction
Strutting &
Bracing
Curing
Leveling
Vibrating
Provide BFS &
CC Layer
CC Block
Placing
Reinforcement
placing
Concrete
Casting

9.  Shoring is commonly used when installing the foundation.
 Shoring support the surrounding loads until the underground
levels of the building are constructed.
 Used to prevent the side soil from collapsing.
 Can be of 3 types:
i. Concrete Pile shore
ii. Timber Pile Shore
iii. Steel Pile shore
Shoring

10. Concrete Pile Shore Steel Pile Shore

11. o After Shoring the soil is
excavated.
o The soil wasn’t excavated
fully at once rather it was
done step wise for depth
basis bracing.
Soil Excavation

12. o A horizontal support for the boundary
shores during excavation and foundation.
o Depends on the depth of foundation.
o Also known as horizontal shores.
o Ties and Struts are placed.
o Further excavation was done if needed.
Strutting & Bracing

13. King Post
Strutting
Bracing

14.  For Leveling the soil, spade or
other tools are used.
 Soil is dressed with sand.
 Sand is compacted by hammer.
Leveling & Compaction

15.  First one layer of brick flat
soaling is placed over the
area.
Provide Polythene, BFS & CC Layer
 After that Cement concrete
layer of 3” thickness is
provided.
 After that Polythene is placed
as damp proof course.

16.  CC blocks of Circular/Cubic
shape of about 3” height are
placed on the CC layer.
 Blocks are provided to
maintain clear cover at the
bottom.
CC Block Placing

17.  A batch of horizontal reinforcement
placing;
 Another batch of reinforcement
placement to complete the bottom
mesh;
 Column rod placement;
 Vertical rod (chair) placement over
bottom mesh to hold the upper mesh;
 Upper mesh placement.
Reinforcement Placement

18. Column
Bar
Chair
Bottom
Mesh
Top
Mesh

19. Important Factors
Reinforcement Selection 12mm ~ 25mm
60 ~ 72.5 Graded
Chair Height 2 feet
Heavy steel wire used for joining the reinforcement
Spacing between two Vertical & Horizontal
reinforcement bar are 6 “

20. Retaining Wall
• It’s one kind of wall constructed
around the mat foundation.
• It is constructed to resist the
lateral load of soil.

21.  The process of pouring concrete
in the reinforcement mesh.
 Start from one end.
 Casting was done in layers.
Casting

22. • Casting and Compacting
was done simultaneously.
• Vibrator machine was
used for compacting
Compaction

23.  After casting the concrete,
the upper surface was
leveled.
 Levelers were used for
this process.
Leveling

24.  Curing is done for 28 days.
 Water is sprayed on the
surface for curing.
 Making water pond on the
surface.
Curing

25. Advantages:
• Reduces differential settlement.
• Ideal for poor ground condition.
• Provides more space.
• Provides basement.
Disadvantages:
• Cost is high as shore protection is needed.
• As the slab has greater thickness, heat may trap inside during hydration
reaction.
• During construction water level may rise that might cause the lose of
contact with the soil.
Advantages & Disadvantages Of Mat Foundation

26.  The whole Mat foundation wasn’t done at once
 This presentation is based on the observations on Mat
foundation in various sites & meeting with concerned
engineers & workers.
 The purpose of this presentation was to gather some
practical experience on Mat foundation.
 During the making of this presentation, we also practically
experienced other major & minor parts of a construction.
 Casting was done at night to reduce time wastage.
Conclusion