Department of Civil and Environmental Engineering

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Department of Civil and Environmental Engineering

Seminar	Announcement	
Beltrami	Room,	Building	no.	5,	Leonardo	Campus	
Department	of	Civil	and	Environmental	Engineering	
Wednesday,	1st	April	2015,	from	16:00	on	
High	performance	vegetable	fibre	cement	based	composites	(HPVFRC):		
Fundaments	and	potential	applications	
Professor	Romildo	Dias	Toledo	Filho		
Universidad	Federal	do	Rio	de	Janeiro/PEC/COPPE	
In	 recent	 years,	 a	 great	 deal	 of	 interest	 has	 been	 created	 worldwide	 on	 the	 potential	
applications	of	natural	fibres	such	as	sisal,	jute,	curaua	and	wood	pulps	as	reinforcement	in	
cement	 based	 composites.	 These	 fibres	 have	 been	 considered	 promising	 as	 reinforcement	
materials	 because	 they	 are	 abundant,	 renewable	 and	 biodegradable,	 low	 cost	 and	 energy	
saving,	and	present	high	specific	strength	and	stiffness.		
There	 are,	 however,	 important	 questions	 regarding	 the	 use	 of	 vegetable	 fibres	 as	
reinforcement	 in	 cement	 matrices	 that	 need	 to	 be	 responded:	 (i)	 How	 to	 produce	 durable	
vegetable	 fibre‐cement	 based	 composites	 (VFRC)?	 (ii)	 How	 strong	 is	 the	 adhesion	 of	 these	
water	 absorbent	 cellular	 fibres	 to	 the	 cement	 matrices?	 (iii)	 How	 can	 we	 improve	 the	
characteristics	 of	 the	 fibre‐matrix	 interface?	 (iv)	 How	 to	 produce	 VFRC	 of	 High	 Mechanical	
Performance?	 (v)	 How	 the	 matrix,	 reinforcement	 and	 processing	 technique	 need	 to	 be	
tailored	 to	 allow	 the	 production	 of	 defection	 hardening	 and	 strain	 hardening	 short	 fibre‐
HPVFRC?	 (vi)	 How	 to	 improve	 the	 bonding	 between	 jute	 textile	 and	 cement	 matrices	 to	
produce	 high‐performance	 vegetable	 fibre	 textile‐composites?	 (vii)	 Due	 to	 their	 porous	
microstructure	 can	 vegetable	 fibres	 be	 able	 to	 create	 a	 porous	 network	 through	 which	 the	
moisture	 can	 be	 distributed	 throughout	 the	 cementitious	 matrix	 and	 activate	 the	 delayed	
hydration	reactions	which,	together	with	carbonation,	can	be	responsible	of	the	autogeneous	
healing	of	cracks	and	damages	in	cementitious	composites?	
In	 this	 presentation	 the	 above	 questions	 will	 be	 responded	 based	 on	 the	 results	 of	 the	
research	 activities	 carried	 out	 at	 the	 Laboratory	 of	 Structures	 and	 Materials	 of	 the	 Civil	
Engineering	Department	of	COPPE/UFRJ,	Rio	de	Janeiro‐Brazil	in	the	last	ten	years.	Potential	
applications	of	this	low‐cost	and	energy	efficient	composite	family	will	also	be	...
Politecnico di Milano
Department of Civil and Environmental Engineering
Piazza Leonardo da Vinci, 32
20133 Milano
Partita Iva: 04376620151 Codice fiscale: 80057930150
In recent years, a great deal of interest has been created worldwide on the potential
cementbasedcomposites.Thesefibreshavebeenconsideredpromising as reinforcement
materials because they are abundant, renewable and biodegradable,lowcostandenergy
There are, however, important questions regarding the use of vegetable fibres as
reinforcement in cement matrices that need to be responded: (i) How to produce durable
vegetable fibre‐cement based composites (VFRC)? (ii) How strong is the adhesion of these
water absorbent cellular fibres to the cement matrices? (iii) Howcanweimprovethe
characteristics of the fibre‐matrixinterface? (iv)How toproduceVFRCofHighMechanical
tailored to allow the production of defection hardening and strain hardening short fibre‐
HPVFRC? (vi) How to improve the bonding between jute textile and cement matrices to
produce high‐performance vegetable fibre textile‐composites? (vii) Due to their porous
microstructure can vegetable fibres be able to createa porous network through which the
moisture can be distributed throughout the cementitious matrix and activate the delayed
In this presentation the above questions will be responded basedontheresultsofthe
research activities carried out at the Laboratory of StructuresandMaterialsoftheCivil
Department of Civil and Environmental Engineering
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