1. Fiber reinforced concrete
PRESNTED BY
YOGESH C. KOTIYAL
M.TECH FIRST YEAR
GUIEDED BY
Dr. S. K. MADAN

2. Introduction
Fiber Reinforced Concrete can be defined as a composite material consisting of mixtures of cement, mortar or concrete and discontinuous, discrete, uniformly dispersed suitable fibers.
Continuous meshes, woven fabrics and long wires are not considered to be discrete fibers, Because of some workability and impact resistance demerits.

3. Properties
The newly developed FRC is 500 times more resistant to cracking and 40 percent lighter than traditional concrete.
FRC can sustain strain-hardening up to several percent strain, resulting increase in a material ductility when compared to normal concrete .

4. FRC also has unique cracking behaviour
FRC also has unique cracking behaviour. When loaded to beyond the elastic range, FRC maintains crack width to below 100 µm, even when deformed to several percent tensile strains.

5. Material uses
Fibers include steel fibers, glass fibers, synthetic fibers and natural fibers. Within these different fibers the character of fiber reinforced concrete changes with varying concretes, fiber materials, distribution, orientation and densities.

6. Typical Proportions For FRC…
Ingredients Proportions
Cement content kg to 550 kg/m2
W/C Ratio to 0.6
Sand/Total Aggregates %
Max aggregate size mm
Air content %
Fiber Percentage
Steel percent for 78Kg/m3
Glass % for25Kg/m3
Nylon % for11Kg

7. applications
Fibre- reinforcement is mainly used in shotcrete, but can also be used in normal concrete.
Fibre-reinforced normal concrete are mostly used for on-ground floors and pavements, but can be considered for a wide range of construction parts (beams, pillers, foundations etc) either alone or with hand-tied rebars

8. Advantages
Fibres are usually used in concrete to control cracking due to both plastic shrinkage and drying shrinkage.
They also reduce the permeability of concrete and thus reduce bleeding of water.
Some types of fibres produce greater impact, abrasion and shatter resistance in concrete.

9. Steel fibres can:
Improve structural strength.
Reduce steel reinforcement requirements
Improve ductility.
Reduce crack widths and control the crack width tightly thus improve durability.
Improve impact & abrasion resistance.
Improve freeze-thaw resistance.

10. Polypropylene and Nylon fibres can:
Improve mix cohesion, improving pumpability over long distances.
Improve freeze-thaw resistance.
Improve impact resistance.
Increase resistance to plastic shrinkage during curing.

11. pre cast FRC

12. Conclusion
Recent studies performed on a high-performance fibre-reinforced concrete found that adding fibres provided residual strength and controlled cracking.
There were fewer and narrower cracks in the FRC even though the FRC had more shrinkage than the control.
Residual strength is directly proportional to the fiber content.

13. References fiber reinforced concrete by joost c. walraver
FRC by R. N. Swammy.
Encyclopedia FRC.

14. Thank you