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seminar on natural fibre reinforced concrete pdf

Abstract

Fiber-reinforced concrete (FRC) is concrete containing fibrous material which increases its structural integrity. It contains short discrete fibers that are uniformly distributed and randomly oriented. 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.

Introduction

Natural fibres such as wood and vegetable fibre offer many advantages such as renewability, recyclability low specific gravity and high specific strength. In Malaysia most of the studies only focused on producing EFB as MDF and pulp and paper products. This paper reviews the development of natural fibres for building material and discusses the performance of oil palm empty fruit bunch (EFB) reinforced concrete roof slates produced in a preliminary experiment. Oil palm EFBs were used partially as cement replacement at levels of 0.5% and 1.0% and compared with the control specimens (0% fibre content). From the preliminary experiment, the physical properties of EFB roof slates were evaluated. Results show flexural strength and density decreased with increased fibre contents that were mixed with various water cement ratio. However, the results still exceeded the level set by the ASTM of 4 N/mm2. The preliminary results from the experiment suggest that oil palm EFBs have a potential to be a material component of reinforced mortar roofing slates with the appropriate water cement ratio and concrete mix.

Fiber reinforced concrete is used for:

Industrial flooring
Sprayed concrete
Slender structures (usually in precast plants)
Fire resistant structures
mortar applications (rehabilitation)
Types of Fiber-Reinforced Concrete

Steel Fiber-Reinforced Concrete
Glass Fiber Reinforced Concrete
Synthetic Fibers
Natural Fiber Reinforced Concrete
Benefits

Improve mix cohesion, improving pump ability over long distances
Improve freeze-thaw resistance
Improve resistance to explosive spelling in case of a severe fire
Improve impact resistance
Increase resistance to plastic shrinkage during curing
 Effects of fiber reinforced concretes

Improved durability of the structure
Increased tensile and flexural strengths
Higher resistance to later cracking
Improved crack distribution
Reduced shrinkage of early age concrete
Increased fire resistance of concrete
Negative influence on workability
Improved homogeneity of fresh concrete