flexural stress block development for polypropylene hybrid fibre reinforced concrete

8/9/2019 Flexural Stress Block Development for Polypropylene Hybrid Fibre Reinforced Concrete

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Flexural Stress Block Developmfor Polypropylene Hybrid FibreReinforced Concrete

Prese

Gaurav Nadda

Guide

Dr& Harvinder Sin'(


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Deficiencies ,it( Concrete

-o* +ensile Stren't(&

-o* Post Crackin' Capacity&

Brittleness and lo* Ductility&

-imited Fati'ue -ife&

)ncapable of .ccommodatin' -ar'e Deformatio

-o* impact Stren't(&


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Fibre Reinforced Concrete

fibre Reinforced Concrete is a composite material consmixtures of cements/ mortar or concrete and discontinuouuniformly dispersed suitable fibres&

+(ere are currently $00000 metric tons of fibre used forreinforcement& +(e fibre material can be steel/ cellulose

polypropylene/ 'lass/ nylon and polyester& +(e steel fibre remost used fibre of all 102 of total tonna'e used% foll

polypropylene fibre 302%/ Glass 12% and ot(er 312%&


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Hybridi4ation of Fibres

Hybridi4ation means to mix t*o or more t(an t*o types in a concrete matrix&

Polypropylene (ybrid Fibre reinforced concrete means polyprfibres is used in addition *it( steel fibres to reinforce concret

+(e (ybridi4ation of fibres in concrete may be done by mfibres of different p(ysical/ 'eometrical and mec(anical p


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Factors !ffectin' Properties of FibreReinforced concrete

5ixin'&

6olume of fibres&

.spect ratio of t(e fibre&

7rientation of t(e fibre&

Workability and compaction.


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-iterature Revie*

Ibrahim et al., (2013) studiedeffects on mec(anical properties ofindustriali4ed steel Fibres additionto normal *ei'(t concrete atdifferent volumetric percenta'es802 as control specimen%/ 0&102/

0&912/ #&002 and #&312 & Hefound t(ere is not very si'nificantincrease in compressive stren't(/ but split tensile stren't( increases*it( increasin' fibre content&

He also found t(astren't( varies fro:32/ ::2 to 9;2to #002 for conc

(avin' #&02/ #&12volume fractions

respective


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Patel et al (200)! He found t(at t(e compressive/ split

flexural stren't( improved on addition of #&1 2 of polyprop

in t(e concrete&

"en#el et al (2002) conducted t(e split tensile stren't( usin

to > k'?m$& )t is found t(at t(e split tensile stren't( incr

increasin' fibre content fibres tend to brid'e t(e micro

(amper t(e propa'ation of cracks& ,(en tensile stress is trafibres/ t(e micro cracks are arrested and t(us improve t(e s

stren't( of concrete&


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7b@ectives

+o study t(e be(avior of polypropylene (ybrid Fibre reinforceconcrete&

+o interpret t(e results and develop a flexural stress block for

polypropylene (ybrid Fibre reinforced concrete&

+o develop a mat(ematical model and desi'n c(art for analys polypropylene (ybrid Fibre reinforced concrete members&


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Scope of t(e ,ork

!n(ancin' t(e structural properties of concrete is one of t(e ma@or coin construction industries no* a day&

By developin' flexural stress block for polypropylene (ybrid FibreReinforced concrete/ ) *ill find t(e mat(ematical expression for rectsection to find t(e ultimate flexural stren't( of polypropylene (ybridReinforced concrete rectan'ular section&

By t(e absence of codified desi'n approac(/ t(e utili4ation of (ybridin structural application is (indered& +(is study *ill also be (elpful f

desi'ners and code *riters&

Fibre (ybridi4ation may be (elpful to optimi4e material performance


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Plannin' of ,ork

5ix Desi'n8" 530 'rade concrete&

Castin' of specimens8" By usin' various combinations 0&3#2SF/ 0&102PP A 0&912 SF/ 0&102PP A #&312 SF/ 0&312PSF%&

Si4es of specimens8 "#10mm cube for compressive stren't(diameter $00mm len't( cylindrical specimens for split tensiland #00=#00=100mm beam specimen for flexural stren't(&

Curin'8" .fter demouldin' curin' of specimens *ill be 3days&


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+estin'8 "t(ese specimens *ill be tested for

• Compressive stren't(&

• Split tensile stren't(&

• Flexural stren't(&

)nterpretation of Results8 " From t(e results develop flexuralstress block for polypropylene (ybrid Fibre Reinforcedconcrete& .nd usin' flexural stress block developmat(ematical expression to find t(e ultimate flexuralstren't( of polypropylene (ybrid Fibre Reinforced concrete


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+(ank

ou

flexural stress block development for polypropylene hybrid fibre reinforced concrete

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