Use of Recycled Short Fibers in Structural Concrete to

Enhance Mechanical Properties

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Sandaruwini A.H.W.E. (RU/E/2008/159)Bandara K.A.J.M. (RU/E/2008/014)

SupervisorDr. Sudhira De Silva

Introduction

Concrete is the most frequently used construction material in the world.

It has low tensile strength, low ductility, and low energy absorption

Mechanical properties of concrete can be enhanced by adding a small fraction of short fibers to the concrete

Fiber Reinforced Concrete

Applications of FRC

Objectives

Research Significance

Literature Review

Proposed Methodology

Testing Procedure

Activity Plan

Introduction

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Fiber Reinforced Concrete

What is fiber reinforced concreteFiber reinforced concrete (FRC) is concrete containing

fibrous material which increases its structural integrity.

Different type of fibers Steel Fibers PP(polypropylene) Fiber and PET fibers Glass-Fibers Asbestos Fibers Carbon Fibers Coconut coir fibers Glass-fiber reinforced

concrete

PP fiber reinforced concrete.

Fiber Reinforced Concrete

Applications of FRC

Objectives

Research Significance

Literature Review

Proposed Methodology

Testing Procedure

Activity Plan

Introduction

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Applications of FRC

Thin sheets and irregular shapes Pavements Columns Bridge decks Airport construction as runways Taxiways Roof tiles Non pressure pipes Panels Curtain walls

Fiber Reinforced Concrete

Applications of FRC

Objectives

Research Significance

Literature Review

Proposed Methodology

Testing Procedure

Activity Plan

Introduction

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Objectives

To identify suitable materials to enhance the

mechanical properties of concrete.

To study the effect of fiber fraction and size on

mechanical behavior of fiber reinforced concrete.

To prepare specifications for future requirements. 

Fiber Reinforced Concrete

Applications of FRC

Objectives

Research Significance

Literature Review

Proposed Methodology

Testing Procedure

Activity Plan

Introduction

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Research Significance

Environmentally friendly.

Waste utilization.

Effective usage of recyclable waste.

Cost effective.

Fiber Reinforced Concrete

Applications of FRC

Objectives

Research Significance

Literature Review

Proposed Methodology

Testing Procedure

Activity Plan

Introduction

Steel waste PET Bottle Waste6

Literature Review

Effect of Textile Waste on the Mechanical Properties of Polymer Concrete (Joao Marciano Laredo dos Reis, 2008, Brazil)

The mechanical behavior of polymer concrete reinforced with textile trimming waste was investigated.

Fibers at 0, 1 and 2% of the total weight was used.

Fiber Reinforced Concrete

Applications of FRC

Objectives

Research Significance

Literature Review

Proposed Methodology

Testing Procedure

Activity Plan

Introduction

Flexural strength test results Compressive strength test results

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Literature ReviewFiber

Reinforced Concrete

Applications of FRC

Objectives

Research Significance

Literature Review

Proposed Methodology

Testing Procedure

Activity Plan

Introduction

Utilization of Recycled Carpet Waste Fibers for Reinforcement of Concrete and Soil [Youjiang Wang, U.S.A., 2006] The fibers were obtained from shredded carpet backing.

The fiber length ranged from near zero (powder) to about 25 mm, and about

40% of the fibers were shorter than 5 mm.

The matrices included concrete with coarse aggregates, mortar with regular

river sand, and mortar with very fine silica sand. Portland cement was used with a water to cement ratio of 0.60 to 0.63.

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DosageKg/m3

Approx.(%) Slumpmm

Flexural Strength(MPa)

Compression Strength(MPa)

5.95 0.47 70 3.79 27.6

Fiber Reinforced Concrete

Applications of FRC

Objectives

Research Significance

Literature Review

Proposed Methodology

Testing Procedure

Activity Plan

Introduction

Literature Review

Effect of Fiber Content on Dynamic Properties of Coir Fiber Reinforced Concrete, University of Auckland, New Zealand, 2010

Fiber length : 7.5 cm

W/C ratio Compressive strength σ

Slump of CFRC Splitting tensile strength STS

Effect of fiber content on density of CFRC

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Fibers Concrete with Recycled Aggregate -Masonry and Concrete(VVytlacilova, Czech Technical University in Prague, Czech Republic, Singapore, 2010)

Fresh fiber concrete The preparation of slabs from fiber concrete

Fiber Reinforced Concrete

Applications of FRC

Objectives

Research Significance

Literature Review

Proposed Methodology

Testing Procedure

Activity Plan

Introduction

Literature Review

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Applicable are fibers with length 60-90 mm and width 1-2 mm.

Type of Fibers Volume of Fibers(%)

Compressive Strength(MPa)

Tensile Strength(MPa)

Fort Ferro 0.5 21.97 2.22

PET 1.5 28.67 3.07

Benesteel 1.0 26.96 2.62

Proposed Methodology

The diameter of coir fiber : 0.10 to .75mm The length of coir fiber : 25 to 200mm The diameter of steel fiber : 0.25 to 2.06mm The length of steel fiber : 6.4 to 76mm The size of PET fiber : 3.6 to 6.2mm squares

Fiber Reinforced Concrete

Applications of FRC

Objectives

Research Significance

Literature Review

Proposed Methodology

Testing Procedure

Activity Plan

Introduction

Coir Fibers

Steel Fibers

PET Bottle practical

Footwear waste11

Testing Procedure

Compressive strength(BS 1881: Part 121: 1993)

Tensile strength (BS 1881: 114)

150mm x 300mm concrete cylinder will be used for each mix design.

150 mm x 150 mm x 150 mm concrete cubes will be used for each mix design.

Fiber Reinforced Concrete

Applications of FRC

Objectives

Research Significance

Literature Review

Proposed Methodology

Testing Procedure

Activity Plan

Introduction

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Flexural strength (BS 1881: 5 1970)

Density test (BS 1881: 114) Water absorption test (BS 1881: 122)

Testing ProcedureFiber

Reinforced Concrete

Applications of FRC

Objectives

Research Significance

Literature Review

Proposed Methodology

Testing Procedure

Activity Plan

Introduction

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Activity PlanFiber

Reinforced Concrete

Applications of FRC

Objectives

Research Significance

Literature Review

Proposed Methodology

Testing Procedure

Activity Plan

Introduction

Task Days From To

Total Duration of the Project 274 2012/01/12 2012/10/11

Literature Review 48 2012/01/13 2012/02/29

Collection of Aggregate and other materials 61 2012/01/20 2012/03/20

Preparation of project Proposal 10 2012/02/24 2012/03/04

Planning of the Specimen Requirement 09 2012/02/29 2012/03/12

Prepare the Test Specimen 26 2012/03/05 2012/03/30

Experiment under Laboratory condition 195 2012/03/19 2012/09/21

Analysis of results 192 2011/03/22 2012/09/21

Preparation of the Final Report 30 2012/09/12 2012/10/11

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