Chapter2

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Chapter2

  1. 1. Materials Chapter 2
  2. 2. Reinforced Concrete• Concrete – Cement – Aggregate • Coarse • Fine – Water – Admixture
  3. 3. Cement• Ordinary Portland Cement- Type I• CaO-Limestone• SiO2 Al2O3 -Clay or shale• Ground, blended and fused to clinker in kiln• Gypsum is added• Comes in bag of 50kg
  4. 4. Cement• Water-cement ratio- 0.4 to 0.6• High strength concrete- as low as 0.21• Hydration process- calcium silicate Hydrate• Heat of hydration
  5. 5. Aggregate• 65 to 75% volume• Coarse aggregate- stone chips, brick chips, gravel• Fine aggregate- sand• Concrete unit weight -140 to 152 pcf, 145pcf• Lightweight aggregate-shale, slate, slags, brick chips• Heavy weight aggregate• Recycled concrete
  6. 6. • Proportioning and mixing• Conveying, Placing, compacting and curing
  7. 7. Quality Control
  8. 8. Admixtures• To improve concrete performance• Air-entraining• Accelerating• Set Retarding• Plasticizer, super plasticizers• Viscosity modifying-self compacting
  9. 9. Properties in Compression
  10. 10. Poisson’s ratio 0.15 to 0.20
  11. 11. Creep
  12. 12. Properties in tension
  13. 13. High strength concrete• 8 to 20 ksi or higher• High performance concrete
  14. 14. ReinforcementStrong Bond-no slip
  15. 15. Reinforcing Bars
  16. 16. Stress strain curvesTMT bars
  17. 17. Prestressing steel

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