Ductile and Flexible Concretes

8/8/2019 Ductile and Flexible Concretes

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DUCTILE AND FLEXIBLE

CONCRETES

A PRESENTATION BY

Engr: SULEMAN DAUD

M.Sc. Fall 2006


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CONTENTS

INTRODUCTION

COMPOSITION

STRENGTHSPERFORMANCE

WORKABILITY

PROPERTIESUSES

REFRENCES


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Introduction

Imagine a building material thathas the strength of steel, with the

versatility of concrete, theflexibility of plastic or wood, thedurability of stone and theaesthetic richness of ceramics.

This is the promise ofDuctile/Bendable concrete - a newultra-high performance material.


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Engineered Cement

Composites (ECC).A new type of fiber-reinforced bendableconcrete is developed at University ofMichigan. It is called Engineered

Cement Composites (ECC).It is 500 times more resistant tocracking

40 percent lighter in weight

It is 37 percent less expensive,Consumes 40 percent less energy,

Produces 39 percent less carbondioxide


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ECC (Flexible Concrete)


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DuctalAfter more than a decade ofdevelopment, a new ultrahigh-performance concrete reinforced

with steel or organic fibersdeveloped by team of researchersfrom three French firms--Lafarge,Bouygues, and Rhodia--the new

family of concretes is calledDuctal, a name specifically chosento reflect its ductility.


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Composition

Several different formulations areavailable; all are based on acombination of cement, silica fume,sand, superplasticizer, water, groundquartz, and fibers.

Wollastonite, a mined siliceous mineralfiber, is also included when extreme

durability and toughness are required.

Tiny fibers that comprise about 2percent of the mixture's volume.


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STRENGTHSThe mix that includes steel fibersdevelops compressive strengths of

23,000 to 33,000 psi and flexuralstrengths of4000 to 7200 psi. Ductal-FO,

with organic fibers, yields somewhatlower compressive strengths of17,000 to

22,000 psi and flexural strengths of2200to 3600 psi. An anti-fire formulation,Ductal-AF, is also available.


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Beyond strength requirements, fiberselection is also based on exposure tocorrosive agents, rheologyrequirements, desired aesthetics, andexposure to human contact. Organicfibers are typically used where humancontact is expected because the steelfibers are extremely small (0.2 mmdiameter, 13 mm long) and can easilypuncture human skin.


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Performance

Under extreme load, these ductileconcretes behaves similar to steel

by bending rather than cracking.This ductile behavior comes fromwell-dispersed micro-crackingwhich makes good use of the fiber-matrix.


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WORKABILITYFiber-reinforcedDuctal is highlydurable and can beused in thin sectionswithout rebar. It canrange from dry-castto self-placing with aspread, or slumpflow, of up to 30inches.


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PROPERTIES


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COMPARISON WITH NORMAL

CONCRETE


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Comparison with steel and

normal concrete.


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USES


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REFRENCESwww.lafargenorthamerica.com

www.imagineductal.com

www.futurefeeder.com


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THANKS

Q U E S T I O N S ? ? ? ? ? ? ? ?

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Ductile and Flexible Concretes