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Ferro cement

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Ferro cement

  1. 1. Annamacharya Institute Of Technology And Sciences Ferro-cement Presented by D. Manasa 13701A0129
  2. 2. Contents • Introduction • What Is Ferro-cement? • Materials Used In Ferro-cement • Properties Of Ferro-cement • Behaviour Of Ferro-cement • Process Of Ferro-cement • Cost Effectiveness Of Ferro-cement • Applications • Advantages • Disadvantages • Conclusion 4/26/2015 2
  3. 3. Definition Ferro cement is a form of reinforced concrete using closely spaced multiple layers of mesh and/or small diameter rods completely infiltrated with, or encapsulated inmotor 3
  4. 4. Typical Cross Section Of Ferro cement 4
  5. 5. Materials Used In Ferro Cement • Cement mortar mix • Skeleton steel • Steel mesh reinforcement or Fibre-reinforced polymeric meshes 5
  6. 6. 6
  7. 7. Cement Mortar Mix • OPC and fine aggregate matrix is used • sand occupies 60 to 75% of the volume of the mortar • Plasticizers and other admixtures are used 7
  8. 8. Skeleton Steel • Used to impart structural strength in case of boats, barges etc. • Reinforcement should be free from dust, rust & other impurities 8
  9. 9. Steel Mesh Reinforcement • Available as woven/interlocking mesh and welded mesh • Expanded-metal lath is also used • Made from carbon, glass etc. 9
  10. 10. Commonly used reinforcing mesh 10
  11. 11. Chemical Admixtures in Ferro cement • water reduction, with strength and reduces permeability. • Air entrainment, which increases resistance to freezing and thawing; • suppression of reaction between galvanized reinforcement and cement .
  12. 12. Water 12 • Water should be portable. • clean, and free from organic matter - silt, oil, sugar, chloride and acidic material • pH equal or greater than 7 . Mix Proportions •Sand: cement ratio (by mass) 1.5 to 2.5 •Water: cement ratio (by mass) 0.35 to 0.60
  13. 13. Properties Of Ferro Cement • It is a very durable, cheap and versatile material. • Low w/c ratio produces an impermeable structures • less shrinkage, and low weight. • high tensile strength and stiffness • better impact and punching shear resistance • undergo large deformations before cracking or high deflections 13
  14. 14. Behavior of Ferro-cement in tension RC in tension Ferro cement in tension 14
  15. 15. Process Of Ferro-cement Construction • Fabricating the skeletal framing system • Applying rods and meshes • Plastering • Curing 15
  16. 16. Cost Effectiveness • Depends on type economic system and applications. • Relative cost of labor. • Doesn’t need heavy plant or machinery. • Low cost construction materials are used. 16
  17. 17. 17 Applications • Floors And Roofs • Waterproofing
  18. 18. 18 • Rural Applications • Marine Applications
  19. 19. 4/26/2015 19 • Transport System • Agriculture Structures
  20. 20. • Fire resistant structures • Soil stabilization • Man hole covers • Wall cupboards • pipes 20
  21. 21. Advantages Of Ferro -Cement: • 20% savings on materials and cost • Suitability for pre-casting • Flexibility in cutting, drilling and jointing • Very appropriate for developing countries, labor intensive • Good impermeability • Fabricated into any desired shape. • Ease of construction, low weight and long lifetime. • Better resistance against earthquake. 21
  22. 22. Disadvantages of Ferro-Cement: • Corrosion of the reinforcing materials due to the incomplete coverage of metal by mortar. • It is difficult to fasten to Ferro-cement with bolts, screws, welding and nail etc. • Large no of labors required. • Cost of semi-skilled and unskilled labors is high. • Tying rods and mesh together is especially tedious and time consuming. • Low ductility • Susceptibility to stress rupture failure • It can be punctured by collision with pointed objects. 22
  23. 23. Conclusion In India, Ferro-cement is used often because the constructions made from it are more resistant to earthquakes. It has a wide range of other uses including sculpture and prefabricated building components. 23
  24. 24. 4/26/2015 24
  25. 25. 4/26/2015 25

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