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Fibrillated Polypropylene Fibers
In Reinforced Concrete
DJOY Engineering Co.
Doumon KashkooliJoshua Plenert
Osvaldo Escalona
Ying Song
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Introduction
Polypropylene fibers is the synthetic fibers,which was used for concrete reinforcement
Fiber reinforced concrete (FRC) isconcrete containing fibrous material whichincreases its structural integrity
Figure 1. Fibrillated Polypropylene Fiber 2
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Application
Fibrillated Polypropylene Fiber (FPF) is widelyused in general concrete applications where atough, ductile, and corrosion-resistant concrete is
required.
FPF main objective is to controltemperature/shrinkage cracking while improving
basic durability properties.
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Application (contd)
FPF is applied but not limited to slabs-on-grade,overlays/toppings, curbs, slope paving,driveways, sidewalks, basement floors, garage
floors, architectural/colored concrete, precast,mortar, grout, water tanks, and sewagetreatment facilities.
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Benefits
Applying FPF additive to concrete mix gives:
Higher Tensile and Compressive Strength
Lower Shrinkage Effect and Higher Ductility
Higher Toughness and Flexural Strength
Saving of concrete itself due to a constantthickness
Higher Elasticity to bending traction Higher Elasticity of the concrete
A reduction in the risks of corrosion
A reduction in micro cracks 5
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Benefits (contd)Higher Tensile And Compressive Strength
Figure 2. Tensile StrengthFigure 3. Compressive Strength 6
Fiber Reinforced Concrete is proven to increase both tensileand compressive strength as their cylinders continue tosustain load and endure large deformations without shatteringinto pieces. [ACI 544.1R-96]
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Benefits (contd)Higher Toughness and Flexural Strength
The material properties of fiberreinforced concrete are somewhatvariable based on fiberconcentration and the form of the
fiber reinforcement with increasesof more than 100% having beenreported.
The increases in flexural strength
is particularly sensitive, not onlyto the fiber volume, but also to theaspect ratio of the fibers, withhigher aspect ratio which led to itsstrength increases.
Figure 4. Flexural Strength 7
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Benefits (contd)
Lower Shrinkage Effect and Higher DuctilityFiber reinforced concrete areintended to be used toenhance the splitting tensile,
first crack strength andflexural toughness, themultidirectional positioning offibers in concrete mixturesassists in relieving the stress
that is developed duringshrinkage which results inreduction of plastic anddrying shrinkage cracking.
Figure 5. FRC beam
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VIDEO
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Disadvantages
Fabrication
The process of incorporating
fiber into the cement matrix is
labor intensive and costlier than
the production of the plain
concreteFigure 6. Mixing Collated FPF with concrete
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Substitute
Wire meshReinforcement
Sensitive to environment
Steel corrodes
Cracks easily
Concrete spalling from the
surface
Collated Fibrillated Polypropylene Fiber (CFPF) is anexcellent substitute for wire mesh reinforcement in
concrete reinforcement
Figure 7. Wire mesh reinforcement
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CFPF Typical Dosage and Unit Cost
The typical dosage for CFPF is 1.5 pounds percubic yard or 0.9 kilograms per cubic meter to bemixed with concrete
The typical unit cost for CFPF additive in NorthernCalifornia region is approximately $2.00 per poundwith freight included
Applying CFPF additive to the concrete mixturehas negligible effect on the cost impact ofstructural concrete
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Manufacturers
The Fiber Depot Website: http://www.thefiberdepot.com/
Address: 335 Eakin Road, Harrisville PA 16038 Phone: 1.800.438.9006
Fax: 1.800.439.7003
NyCon Corporation Website: http://www.nycon.com/ Address: 300 Ben Fairless Drive, Fairless Hills PA 19030
Phone: 1.800.456.9266
Fax: 1.401.596.4242
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Any Questions?
Thank You
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