Behavior of frc under static & impact loads

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Primary presentation represent the behaviour of FRC beams under different loads (Static & Dynamic)

Primary presentation represent the behaviour of FRC beams under different loads (Static & Dynamic)

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  • 1. 1
  • 2. B EHAVIOR O F FRC B EAMS U NDERD IFFERENT L OADS By Mohannad M. Abdul-Aziz Supervised By Dr. Mazin B. Abdul-Rahman January 2009 2
  • 3. Fibers in Concrete• The choice of fibers to use should be made based on what properties are required from the concrete, like:4. Reduce bleeding5. Improving impact resistance6. Flexural toughness7. Freeze thaw resistance8. Fire resistance 3
  • 4. Behavior of FRC beams under different loads 1. Fibers in concreteMechanism involved in Fiber Range of load versus deflection operation curves for unreinforced matrix and fiber reinforced concrete 4
  • 5. Behavior of FRC beams under different loads2. Using different types of fibers in concrete• Synthetic fibers are man-made fibers resulting from research and development in the petrochemical and textile industries.• Synthetic Fiber types that have been tried in portland cement concrete are: carbon, nylon, polyester, polyethylene and polypropylene. 5
  • 6. Behavior of FRC beams under different loads2. Using different types of fibers in concrete Examples of commercially available fibers 6
  • 7. Behavior of FRC beams under different loads 2. Using different types of fibers in concretecross-sectional geometries of fibers some typical fiber geometries 7
  • 8. Behavior of FRC beams under different loads 2. Using different types of fibers in concrete 1. Polypropylene Fiber• Polypropylene fibers, the most popular of the synthetics.• Polypropylene is hydrophobic, meaning it does not absorb water. 8
  • 9. Behavior of FRC beams under different loads2. Using different types of fibers in concretePolypropylene fibers are produced either as (left) fine fibres with rectangular cross section or (right) cylindrical monofilament. 9
  • 10. Behavior of FRC beams under different loads2. Using different types of fibers in concrete1. Steel Fiber• fiber length varies from (12.7 mm) to (63.5 mm). The most common fiber diameters are in the range of (0.45 mm) to (1.0mm).• steel fibers have shapes which include round, rectangular, and crescent cross sections, depending on the manufacturing process and raw material used. 10
  • 11. Behavior of FRC beams under different loads 2. Using different types of fibers in concreteSteel fibers with hooked ends Fracture surface of SFRC 11
  • 12. Behavior of FRC beams under different loads 2. Using different types of fibers in concrete-But why do we need fibers in concrete - Concrete is a very brittle material. - The role of randomly distributes discontinuous fibres is to bridge across the cracks. 12
  • 13. Behavior of FRC beams under different loads 2. Using different types of fibers in concrete• The real contribution of the fibres is to increase the flexural toughness of the concrete (defined as some function of the area under the load vs. deflection curve), under any type of loading. 13
  • 14. Behavior of FRC beams under different loads3. Research working plane A- Theoretical Part • Static Analysis for prepared beam samples. – (using ANSYS 11.0 (2007) Program) Program • Impact Resistance Analysis for prepared beam samples. – (using DARC III Nonlinear transient dynamic analysis for three dimensional structures Program) Program To compare the result with the experimental works 14
  • 15. Behavior of FRC beams under different loads3. Research working planeB- Experimental Works – Material that will be used: • Cement • Aggregate • Sand • Fiber (PPF) (length 12mm) (SikaFiber) • Fiber (steel) (length 30mm) (Sika Company) • Super plasticizer (Water reducer) (Sikament- HRWRA-FFN) • Silica fume (Sikafume-HR) 15
  • 16. Behavior of FRC beams under different loads3. Research working plan 16
  • 17. Behavior of FRC beams under different loads3. Research working plane Fiber (PPF) (length 12mm) (product by Sika Company) • Sika Fibre is based on high quality monofilament micro polypropylene fibers. • Appearance/ Colors: White • Packaging: 600g bags at box of 40 bags • Compatibility: Sika Fibre can be used with all Sika® admixtures. • meeting the requirements of: ACI 544-1& 2R. 2R 17
  • 18. Behavior of FRC beams under different loads 3. Research working plane Super plasticizer SP (Water reducer) (Sikament-HRWRA-FFN) (product by Sika Company)• high-range water-reducing admixture (HRWRA) meeting the requirements of:• ASTM C494 Type F or G or ASTM C 1017 Type I or II. II• Chemical Base: Melamine sulphonate polymer based liquid• Compatibility: Sikament FFN can be used with Sika Fiber & Sika fume . 18
  • 19. Behavior of FRC beams under different loads3. Research working plane• Why we used superplasticizer - SP can be used in concrete to :• Get Higher slump without additional water,• lower w/c at equivalent slumps,• improved workability,• increase strength by decreasing (w/cm) 19
  • 20. Behavior of FRC beams under different loads 3. 4. Research working plane plan Silica Fume SF (Sikafume-HR) (product by Sika Company)• SikaFume is a concrete additive in powder form based on silica fume technology.• Meeting the requirements of: ACI Committee 234• Appearance / Colour: Grey to dark grey powder 20
  • 21. Behavior of FRC beams under different loads3.4. Research working plane plan - Silica Fume Product Forms:As-produced powder Water-based slurry 21
  • 22. Behavior of FRC beams under different loads 3. 4. Research working plane plan - Silica Fume Colors:Premium -- White Standard -- Grey 22
  • 23. Behavior of FRC beams under different loads3. Research working plan• Why we used silica fume• Improve the transition zone wich is represented as a thin layer between the bulk hydrated cement paste and the aggregate particles in concrete. This zone is the weakest component in concrete.• Provide concrete with very high compressive strength• Enhancing Mechanical Properties due to its extremely small particle size, and large surface area• Improving Durability 23
  • 24. Behavior of FRC beams under different loads3. Research working plan 24
  • 25. Behavior of FRC beams under different loads3. Research working plan • Mix Design: A- Trial Mix: (to get Ref. mix) 1. Fix w/c (to get compressive strength at least 40 Mpa) 2. Record slump (200mm ± 5mm) according to slump test (ASTM C 143) 3. Casting: - Cubes (150*150*150)mm - Prisms (100*100*50)mm - Impact rings (152 Dia.*63.5 t)mm - Beams (Reference) Reference 25
  • 26. Behavior of FRC beams under different loads3. Research working plan B- Mixes work:• Mix No. (1) Ref. + SP (optimum dosage) + SF (optimum dosage)- Getting the optimum dosage from SP & SF:- Adding SP (as a percentage by weight of cement) to reach the same slump of the Ref. mix.- Then adding SF (as a percentage by weight of cement) to reach the same slump of the Ref. mix.- Record the optimum dosages.- w/c will be reduced due to the effect of SP (as a chemical ad.) and SF (as a mineral ad.). 26
  • 27. Behavior of FRC beams under different loads3. Research working plan 27
  • 28. Behavior of FRC beams under different loads3. Research working plan• SP used demand:• Increase workability that has been decreased with the addition of fibers. ( Balling—When fibers entangle into large clumps or balls in a mixture.)• Silica fume addition usually increases water demand.• SF used demand:• to improved bond strength in the concrete matrix by increasing the paste to-fiber bond. 28
  • 29. Behavior of FRC beams under different loads3. Research working plan 2. Mix No. (2) Mix No.(1) + 0.5 % from PPF (as a VF) 3. Mix No. (3) Mix No.(1) + 0.75 % from PPF (as a VF) 4. Mix No. (4) Mix No.(1) + 1.5 % from PPF (as a VF) 5. Mix No. (5) Mix No.(1) + (50%) 0.5 % from PPF (VF)+ (50%) 0.5 % from Steel Fiber (VF) 6. Mix No. (6) Mix No.(1) + (50%) 0.75 % from PPF (VF)+ (50%) 0.75 % from Steel Fiber (VF) 29
  • 30. Behavior of FRC beams under different loads3. Research working plan7. Mix No. (7) Mix No.(1) + (50%) 1.5 % from PPF (VF)+ (50%) 1.5 % from Steel Fiber (VF)- For each mix we will cast (at least): ( 3 beams ) and ( 3 prisms ) 30
  • 31. Behavior of FRC beams under different loads3. Research working plan• Samples Testing: 1- Static Test: Test by the Universal machine for cubes, prisms and beams. 31
  • 32. Behavior of FRC beams under different loads3. Research working plan 2- Impact test: • Improved impact resistance (dynamic energy absorption as well as strength) is one of the important topics of FRC. • The simplest of the impact tests is the “repeated impact,” drop-weight test. • The hammer is dropped repeatedly, and the number of blows required to cause the first visible crack on the top and to cause ultimate failure are both recorded. 32
  • 33. Behavior of FRC beams under different loads3. Research working plan 33
  • 34. Behavior of FRC beams under different loads3. Research working plan Steel frame (impact resistance test) for beam samples 34
  • 35. Thank you 35