PRESNTED BY YOGESH C KOTIYAL MTECH FIRST YEAR GUIEDED BY Dr S K MADAN Introduction Fiber Reinforced Concrete can be defined as a composite material consisting of mixtures of ID: 600407
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Fiber reinforced concrete
PRESNTED BY
YOGESH C. KOTIYALM.TECH FIRST YEAR
GUIEDED BY
Dr.
S. K. MADANSlide2
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.Slide3
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 . Slide4
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.Slide5
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.Slide6
Typical Proportions For
FRC…
Ingredients Proportions
Cement content 325 kg to 550 kg/m2
W/C Ratio 0.4 to 0.6
Sand/Total Aggregates 50-100%
Max aggregate size 10 mm
Air content 6-9%
Fiber Percentage
Steel 1percent for 78Kg/m3
Glass 1% for25Kg/m3
Nylon 1% for11Kg
Slide7
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 rebarsSlide8
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.Slide9
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.Slide10
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.Slide11
pre cast FRCSlide12
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.Slide13
References
fiber reinforced concrete by joost c. walraver
FRC by R. N. Swammy.
Encyclopedia FRC.www.books.google.comSlide14
Thank you