Presentation on Mat Foundation
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This presentation summarizes the key aspects of a mat foundation. It was presented by 10 civil engineering students with their IDs listed. The presentation covered what a mat foundation is, when they are used, different types, construction procedures including soil testing, reinforcement placement, shuttering, casting, and curing. Construction steps like shoring, waterproofing and bracing were also explained depending on the depth of the foundation.
Presentation on Mat Foundation
- 1. PRESENTATION ON MAT FOUNDATION Department of Civil Engineering 1
- 2. Presentedby Name • Md. Abdul Ahad • Monisha Podder Puja • Arafat Chowdhury • Sabrina Zissan • Mahbub Al Muhaimin • Md. Abu Bakar Siddik • Sabrina Mehenaz • Tanvir Alam Khan • Md. Ashraf Ali • Amit Kumar Baral ID • 12-01-03-104 • 12-01-03-110 • 12-01-03-110 • 12-01-03-124 • 12-01-03-129 • 12-01-03-136 • 12-01-03-144 • 12-01-03-149 • 12-01-03-154 • 11-02-03-16
- 3. Visited Sites Arham Tower, Uttara Pallabi, Mirpur-11 Euro Bangla Real Estate, Mouchak
- 4. MATFoundation • a primary shallow foundation; • a large footing extended over the whole construction area; • Usually large concrete slab supporting many columns; • Commonly used as foundation for high rise buildings with basement; • Mat is also known as Raft; • Usual depth 1~20 feet.
- 5. PCC BED R C C SLAB C C Sectional View Plan View COLUMN MAIN BEAM SECONDARY BEAM MAIN BEAM
- 6. WhenweconstructMaTfoundation? • When the area of individual column footings cover more then 50% area of total land; • When the bearing capacity of soil is too weak to support a structure; • When the cost of deep foundation is higher then Raft foundation. • When the structural load is too high.
- 7. TypesofMAT • Flat plate mat • Plate thickened under columns • Two-way beam and slab • Plate with pedestal • Rigid frame mat • Piled raft
- 8. constructionProcedures Soil test Shoring & Water proofing Partial Excavation (depending on depth) Bracing (depending on depth) Full area excavation Soil compaction BFS & CC or LC layer cover Reinforcement placing Shuttering Casting & Compaction Shuttering removal Curing
- 9. SoilTest • Bearing capacity of soil; • Soil classification; • Ground water level; • Moisture content; • Appropriation & depth of MAT.
- 10. Shoring • Shoring is commonly used when installing the foundation; • Shoring support the surrounding loads until the underground levels of the building are constructed. • Can be of 3 types: Pile shore, steel sheet shore and timber shore.
- 11. Log Shore Pile Shore
- 12. Waterproofing • A layer provided over shoring to prevent moisture; • Cement mortar or steel sheet layer over shoring; • Cement mortar layer is extended over wire mesh.
- 13. Bracing • A horizontal support for the boundary shores during excavation and foundation; • Depends on the depth of foundation; • Also known as horizontal shores.
- 14. Otherfactors Shotcrete leveling layer with steel mesh Retaining Wall King Post
- 15. BFSandCC Layer of bricks on the earth Layer of cement concrete over BFS.
- 16. Reinforcementplacing • Single horizontal reinforcement placing; • 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.
- 19. Importantfactors Reinforcement Selection • 60~72.5 Graded • 12mm~25mm Reinforcement Joint • Heavy Steel wire binding Chair • Distance • Bending
- 20. Importantfactors Hook • Right angled Rod Cutter Rod bender
- 21. Shuttering • Steel plate shutter; • Timber shutter.
- 22. CastMaterial • Mixture ratio 1:2:4; • Sylhet sand is used over 50%; • Stone chips that are used normally is ½”~¾” in size; • Stone chips are preferred than brick chips.
- 23. Casting • Start from one end; • Layer basis casting; • Side basis casting.
- 24. Compaction • By vibrator machine; • Compaction and casting both are done simultaneously;
- 25. Precautionsforcasting • Materials like piece of wood, polythene etc. must be removed before casting from that area;
- 26. Curing