A PRESENTATION ONFIBER REINFORCED CONCRETE

OVER VIEW

CH.GOPI CHAND

Civil engineering department

SRI VENKATESWARA ENGINEERING COLLEGE

PRESENTING BY: Internal guide:

P.Jhansi mam

FIBER REINFORCED CONCRETE

project At : pacific solutions(ECIL)

Hyderabad, A.p

History 1900s, asbestos fibers were used in

concrete. In the 1950s, the concept of composite materials came into being and fiber-reinforced concrete was one of the topics of interest. Once the health risks associated with asbestos were discovered, there was a need to find a replacement for the substance in concrete and other building materials. By the 1960s, steel, glass (GFRC), and synthetic fibers such as polypropylene fibers were used in concrete. Research into new fiber-reinforced concretes continues today.

Concrete is one of the most versatile building material.

Concrete is strong under compression yet weak under tension, brittle and limited ductility material.

Therefore, a form of reinforcement is needed, steel bars reinforce concrete against tension only locally.

Cracks in reinforced concrete members extend freely until encountering a rebar.

The need for Multidirectional and closely spaced reinforcement for concrete arises.

FRC is a concrete mix that contains short discrete fibers that are uniformly distributed and randomly oriented.

INTRODUCTION

Types of fibers

Fibers include steel fibers, glass fibers, synthetic fibers and natural fibers – each of which lend varying properties to the concrete. In addition, the character of fiber-reinforced concrete changes with varying concretes, fiber materials, geometries, distribution, orientation, and densities.

the composite (concrete and fibers) termed Vf. Vf typically ranges from 0.1 to 3%. Aspect ratio (l/d) is calculated by dividing fiber length (l) by its diameter (d). Fibers with a non-circular cross section use an equivalent diameter for the calculation of aspect ratio.

How is it Made?• Mostly the same as regular concrete• fibers are spread throughout the

aggregate and cement mix. • Small layers of the concrete are

poured on top of each other and infused with the fibers and are then connected

• Process is tedious and costly • Big reason why this product costs so

much.

WHY FIBER ?

Fibers are usually used in concrete to control cracking due to plastic shrinkage and to drying shrinkage. They also reduce the permeability of concrete and thus reduce bleeding of water.

Cracks in reinforced concrete members extended freely until encountering a rebar.

Fiber reinforced concrete is used when there is requirement for elimination small cracks.

ADVANTAGES

VERY HIGH COMPRESSION STRENGTH

HIGH TENSILE STRENGTH

HIGH ELASTICITY MODULUS

DUCTILE BEHAVIOUR

HIGH DURABILITY

Mechanism Of Failure Of Concrete Cylinders Under Compression Testing

0.5% fiber

3

1.0% fiber

4

0.25% fiber

2

0% *fiber((control

mix

1

*Fiber fraction by weight of cement content

0% fiber((control

mix

0.25% fiber 0.50% fiber 1% fiber

Mechanism Of Failure Of Concrete Cylinders Under Spilt Tensile Testing

Transparent concrete

Due to embedded nano optical glass fiber elements usually optical fibers. light is conducted through the stone from one end to the other.

For developing transparent concrete by arranging the high numerical aperture Plastic Optical Fibers (POF) .

AREAS OF APPLICATIONS OF FRC MATERIALS

Thin sheets shingles roof tiles pipes prefabricated shapes panels shotcrete curtain walls Slabs on grade precast elements Composite decks Vaults, safes. Impact resisting structures

Transparent Panels

Transparent Partition Wall

SourcesInternet:http://www.litracon.hu/ http://www.danubiusmagazin.hu/magazin/tortenelem/

uvegbeton_e.html Textbook:Fundamentals of Materials Science and Engineering by William

D. Callister Jr. and David G. Rethwisch Chapter 15 Technical Journal:Optics and Photonics News September 2008 issue “Using Nano-

Optics to Control the Phase of Light”