Use of GFRP Rebars as Reinforcement in Concrete

Presented ByNaveen kumar singh

1302800037

OUTLINE

Introduction FRP Materials

FRP Bars Standards & Specifications

Applications Summary

INTRODUCTION

First developed in the mid 1930s, Glass Fiber Reinforced Polymer (GFRP) has become a staple in the building industry

GFRP were inadvertently discovered in 1967 with the attempted destruction of Disneyland’s “House of the Future”. Built between 1956 and 1957, the futuristic house was constructed entirely of fiberglass

By 1994, nearly 600 million pounds of composite materials had been used by the building industry

• The Problem - Corrosion • – Corrosion and deterioration of steel reinforce

• – Mitigation techniques - High costs to rehabilita remediate structures

• – Safety - Construction zones and detours

• • The Solution – FRP Rebars • – Non corrosive concrete reinforcement

• – Increase service life (durability)

• – Hundreds of applications in service in North AMERICA

FRP MATERIALS• Glass fibre materialThese textile fibres are different from other forms of glass fibres used. Textile glass fibres begin as varying combinations of SiO2, Al2O3, B2O3, CaO, or

MgO in powder form.

• Carbon fiberCarbon fibres are created when polyacrylonitrile fibres (PAN), Pitch resins, or

Rayon are carbonized (through oxidation and thermal pyrolysis) at high temperatures

• Aramid fiber material Aramids are generally prepared by the reaction between an amine group and a

carboxylic acid halide group

Factors Affecting Material Characteristics

• Type of fiber • Fiber volume • Quality control procedures during

manufacturingg

• Rate of curing

• Void content

Composites Features

Impervious to chloride ion and chemical atks

Tensile strength is greater that steel

¼ the weight of steel

Transparent to magnetic fields

Electrically non-conductive

Thermally non-conductive

• High strength in the direction of the fibers • the material elastic until failure • High impact strength: in contrast to most metals,

fibreglass does not change shape even when it is ruptured.

Corrosion resistance: unlike metal, fibreglass does not rust away and it can be used to make long-lasting structures.

• Anti-magnetic, no sparks: making it super safe for the power industry, fibreglass has no magnetic field and resists electrical sparks

• Formability: fibreglass can be moulded to almost any desired shape.

Tensile Strength

(MPa)

• Steel483-690• GFRP483-1600•CFRP600-3690

Coefficient of Thermal Expansion

• St eel 6.5

•GFRP 3.5-5.6

•CFRP -4-0

APPLICATIONS

•FRP can be applied to strengthen the beams, columns, and slabs of buildings and bridges. It is possible to increase the strength of structural members even after they have been severely damaged due to loading conditions.

• Applications: Interior and Exterior• Domes• Fountains• Columns• Panels• Roofs• Cast in Place • Precast • Top mat • Top and bottom mat • Decks, parapets, sidewalks • Other applications: tunneling (soft eye, sea MRI rooms,

light rail foundations, railway g culverts, and many more.

• Morristown Bridge Vermont 2002•Emma Park Bridge, Pleasant Grov Utah DOT, 2009•Floodway Bridge, Manitoba, Canad(2005)• O’Reilly Bridge – Canada and many more

Places where GRFP used

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