Post on 04-Aug-2020
Vezelbeton voor constructieve toepassingen – 28/11/2012
ir. Benoit Parmentier Head Division Structures
Belgian Building Research Institute (BBRI)
Research Innovation
Future
Fibre Reinforced Concrete
…@BEFIB ‘12
Vezelbeton voor constructieve toepassingen – 28/11/2012
Introduction BEFIB 2012 Filtered topics Conclusions
30kg/m³ - L=60mm
138 000 fibres in 1 m³
A tremendous potential but a rather limited market share…
BEFIB’12 SUMMARY Where is the potential for growing ? What are the limitations ?
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Introduction BEFIB 2012 Filtered topics
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Introduction
125 papers
139 participants
36 countries
123 institutions
# participants by country
~120 papers/conference
Introduction BEFIB 2012 Filtered topics
Conclusions
Introduction
Evolution #papers @BEFIB Conference
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Introduction BEFIB 2012 Filtered topics
Conclusions
Introduction
9 topics Rheology
Mechanical properties
Nanofibers
Long term properties & durability
Analytical & numerical models
Codes & standards
Innovative structural systems
Structural & industrial applications
Case-studies
42
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Introduction BEFIB 2012 Filtered topics
Conclusions
Introduction
Filtering topics… Specific fibres (natural, synthetic)
Recycled materials & sustainability
Special concretes (SCC & UHPC)
Orientation & distribution of the fibres
Design models
Numerical models
Case-studies & applications
+ 2 keynote lectures
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Keynotes
B. Mobasher Arizona state University
M. di Prisco Politecnico di Milano
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Keynote 1 – B. Mobasher
FRC for sustainable infrastructure systems
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Introduction BEFIB 2012 Filtered topics
Conclusions
Keynote 1 – B. Mobasher
Design & back-calculations via Round Determinate Plate (RDP) test
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Introduction BEFIB 2012 Filtered topics
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Keynote 2 – M. di Prisco
FRC thin walled structures Very light roofing elements
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Introduction BEFIB 2012 Filtered topics
Conclusions
Keynote 2 – M. di Prisco
FRC thin walled structures Very light roofing elements
Retrofitting facade systems
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Research/Innovation
Fibre Concrete Design
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Introduction Filtered topics Conclusions BEFIB 2012
Fibre Concrete Design
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Introduction Filtered topics Conclusions BEFIB 2012
#1 Specific fibres
Sisal
Flax
Hemp
Coconut
Pine (soft wood)
Natural fibres
L. Sierra-Beltran, E. Schlangen (2012)
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Introduction Filtered topics Conclusions BEFIB 2012
#1 Specific fibres
6 specific papers
Macro (structural) fibres
Emod ~5000 MPa (~2,5% steel fibres)
ft ~600 MPa (~50% steel fibres)
Short/Long term behaviour Bending
Shear
Temperature
Predictions Crack widths
Deflections
Ultimate capacity
Synthetic fibres
Synth.
Acier
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Introduction Filtered topics Conclusions BEFIB 2012
#1 Specific fibres Synthetic fibres
Parmentier et al. (2012)
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Synth. Fibres (4,5 kg/m³)
Introduction Filtered topics Conclusions BEFIB 2012
#1 Specific fibres
Shear : synthetic fibres can contribute
Synthetic fibres
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Introduction Filtered topics Conclusions BEFIB 2012
#1 Specific fibres
Shear
Synthetic fibres
Deflection [mm]
Load [kN]
S. Altoubat et al. (2012)
Synth. fibres Min stirrups
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Introduction Filtered topics Conclusions BEFIB 2012
#1 Specific fibres
MC’10 underestimates the shear capacity increase (rebars + fibres)
Synthetic fibres
Without any fibres
+37% +65%
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Introduction Filtered topics Conclusions BEFIB 2012
Semi-analytical model for shear
Model based on push-through test results
T. Soetens (2012)
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Introduction Filtered topics Conclusions BEFIB 2012
#1 Specific fibres
Temperature
Synthetic fibres
Synth fibres
Steel fibres
20°C 30°C 40°C
Time [days]
Creep factor
N. Buratti, C. Mazzotti (2012)
5
0
2.5
20 40 60 80 0
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Introduction Filtered topics Conclusions BEFIB 2012
#1 Specific fibres
Creep in bending
M acKay and Trottier (2004)
Kusterle (2007)
Kurtz and Balaguru (2000)
Long term behaviour
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Introduction Filtered topics Conclusions BEFIB 2012
Guanyu Zhao et al. (2012)
#1 Specific fibres
BBRI (2010)
Long term behaviour
Pure tension Flexure
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Introduction Filtered topics Conclusions BEFIB 2012
#1 Specific fibres
Long term (creep in bending)
Synthetic fibres
T. Kanstad, G. Zirgulis (2012)
Creep factor
3.0
7-10 kg/m³ (0,7-1% vol)
50% fr1
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Time [days]
Introduction Filtered topics Conclusions BEFIB 2012
#1 Specific fibres
Long term (creep in bending)
Synthetic fibres
Time [hours]
Displacement [mm]
60
10
5 kg/m³ (0,5% vol)
60% fr1
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BBRI (2010)
Introduction Filtered topics Conclusions BEFIB 2012
#1 Specific fibres PVA fibres
K. Holschemacher, H. Kieslich (2012)
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Introduction Filtered topics Conclusions BEFIB 2012
#2 Recycled mat. & sustainability
Recycled fibres from scrap tyres
Steel cord as reinforcement
12% in weight
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Introduction Filtered topics Conclusions BEFIB 2012
#2 Recycled mat. & sustainability
Recycled fibres from scrap tyres (workability )
G. Centonze et al. (2012)
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Introduction Filtered topics Conclusions BEFIB 2012
#2 Recycled mat. & sustainability
Recycled fibres
Environmental impact
A. Fantilli, B. Chiaia (2012)
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Introduction Filtered topics Conclusions BEFIB 2012
SCC1 SCC2 NC
#2 Recycled mat. & sustainability
Recycled fibres
Environmental impact
245 245 440
A. Fantilli, B. Chiaia (2012)
Cement
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Introduction Filtered topics Conclusions BEFIB 2012
Fibre Concrete Design
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Introduction Filtered topics Conclusions BEFIB 2012
#3 Special concretes (SCC & UHPC)
SCC : 11 papers
UHPC : 6 papers
SCFRLWAC ???
Self Compacting Fibre Reinforced LightWeight Aggregate Concrete
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Introduction Filtered topics Conclusions BEFIB 2012
#3 Special concretes (SCC & UHPC)
UHPC Repairing techniques (jacketing)
SIDE
TOP
M. Dagenais, B. Massicotte (2012)
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Introduction Filtered topics Conclusions BEFIB 2012
#3 Special concretes (SCC & UHPC)
UHPC Repairing techniques (jacketing)
Truss footbridge (Alicante - 40m span)
J.A. Lopez et al. (2012)
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Introduction Filtered topics Conclusions BEFIB 2012
#3 Special concretes (SCC & UHPC)
UHPC Repairing techniques (jacketing)
Truss footbridge (Alicante - 40m span)
J.A. Lopez et al. (2012)
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Introduction Filtered topics Conclusions BEFIB 2012
#3 Special concretes (SCC & UHPC)
UHPC Repairing techniques (jacketing)
Truss footbridge (Alicante - 40m span)
J.A. Lopez et al. (2012)
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Introduction Filtered topics Conclusions BEFIB 2012
#3 Special concretes (SCC & UHPC)
SCC Slight influence of Dmax on residual values
Huge influence of… Compressive strength
Fibre type
Dosage
Fibre orientation
The only aspect specific to SCC
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Introduction Filtered topics Conclusions BEFIB 2012
#4 Orientation & distribution
SCC panels
A. Abrimshambaf et al. (2012)
TOP SIDE
(splitting) Tests on notched cores
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Introduction Filtered topics Conclusions BEFIB 2012
#4 Orientation & distribution
SCC panels Fibres tend to orient perpendicular to the flow
A. Abrimshambaf et al. (2012)
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Introduction Filtered topics Conclusions BEFIB 2012
#4 Orientation & distribution
SCC panels Fibres tend to orient perpendicular to the flow
A. Abrimshambaf et al. (2012)
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Introduction Filtered topics Conclusions BEFIB 2012
#4 Orientation & distribution
Distribution Use of Carbopol Polymer to compare flow simulations
O. Svec et al. (2012)
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Introduction Filtered topics Conclusions BEFIB 2012
#4 Orientation & distribution
Distribution Use of Carbopol Polymer to compare flow simulations
Use of NDT techniques
L. Ferrara et al. (2012)
Orientation factor
~Inductance
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Introduction Filtered topics Conclusions BEFIB 2012
#4 Orientation & distribution
Distribution Use of Carbopol Polymer to compare flow simulations
Use of DT techniques Hard work for synth. fibres
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Introduction Filtered topics Conclusions BEFIB 2012
Fibre Concrete Design
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Introduction Filtered topics Conclusions BEFIB 2012
#5 Design models
Compression
Flexure
Shear
Punching
…
Too safe (?) if characteristic values are used
The new fib Model Code 2010 integrates FRC
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Introduction Filtered topics Conclusions BEFIB 2012
#5 Design models From constitutive law to design full-scale structures
1 2
3
4
5
R. de Montaignax et al. (2012)
Prediction vs. Exp
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Introduction Filtered topics Conclusions BEFIB 2012
#5 Design models – Inverse analysis
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Introduction Filtered topics Conclusions BEFIB 2012
#5 Design models – Inverse analysis
Load [kN]
Deflection [mm]
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Test
Pred.
Introduction Filtered topics Conclusions BEFIB 2012
#7 Case-studies & applications
Poles
Refractory concrete
Slabs on grade
Elevated (flat) slabs
Pipes
Footbridges
Sandwich panels
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Introduction Filtered topics Conclusions BEFIB 2012
#7 Case-studies & applications
Flat slabs
SLS safety 250%
ULS safety 450%
Casco (The Netherlands)
C. Kleinman et al. (2012)
50 kg/m³ - Spans of 5,6m
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Introduction Filtered topics Conclusions BEFIB 2012
#7 Case-studies & applications
Flat slabs
Mid-scale model
Yield-line theory
U. of Minho
J. Barros et al. (2012)
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Introduction Filtered topics Conclusions BEFIB 2012
#7 Case-studies & applications
Flat slabs WTCB
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Introduction Filtered topics Conclusions BEFIB 2012
#7 Case-studies & applications
Flat slabs WTCB
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Introduction Filtered topics Conclusions BEFIB 2012
#7 Case-studies & applications
Footbridge
GFRP profiles h=55cm
SFRSCC deck 4cm
Span of 12m
45 kg/m³ steel fibres
Bolted connexions + epoxy
P. Mendes et al. (2012)
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Introduction Filtered topics
Conclusions BEFIB 2012
Conclusions & perspectives
Test methods are relevant if well understood
Design methods are correlated to test methods except
if inverse analysis is used (σ-w)
MC’10 is ready to use
Creep of synthetic fibres is sensible
Benefit from preferential orientation in SCC
Innovative applications mixing new concrete types
Time for maturity for FRC ?
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Introduction BEFIB 2012 Filtered topics Conclusions
BBRI - Lab. Structures bp@bbri.be