Presentation by Benoit Parmentier at the ie-net/GBB-BBG conference about Fibre Reinforced Concrete - Summary of the BEFIB 2012 Conference

1. Fibre Reinforced Concrete
Research
Innovation
Future
…@BEFIB ‘12
ir. Benoit Parmentier
Head Division Structures
Belgian Building Research Institute (BBRI)
Vezelbeton voor constructieve toepassingen – 28/11/2012

2. 30kg/m³ - L=60mm
138 000 fibres in 1 m³
A tremendous potential but a rather
limited market share…
Introduction BEFIB 2012 Filtered topics Conclusions

3. BEFIB’12 SUMMARY
Where is the potential for growing ?
What are the limitations ?
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4. Introduction
125 papers # participants by country
139 participants
36 countries
123 institutions
~120 papers/conference
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5. Introduction
Evolution #papers @BEFIB Conference
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6. Introduction
9 topics
 Rheology 42
 Mechanical properties
 Nanofibers
 Long term properties & durability
 Analytical & numerical models
 Codes & standards
 Innovative structural systems
 Structural & industrial applications
 Case-studies
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7. 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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8. Keynotes
B. Mobasher M. di Prisco
Arizona state University Politecnico di Milano
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9. Keynote 1 – B. Mobasher
FRC for sustainable infrastructure systems
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10. Keynote 1 – B. Mobasher
Design & back-calculations via
Round Determinate Plate (RDP) test
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11. Keynote 2 – M. di Prisco
FRC thin walled structures
 Very light roofing elements
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12. Keynote 2 – M. di Prisco
FRC thin walled structures
 Very light roofing elements
 Retrofitting facade systems
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13. Research/Innovation
Fibre Concrete Design
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14. Fibre Concrete Design
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15. #1 Specific fibres Natural fibres
 Sisal
 Flax
 Hemp
 Coconut
 Pine (soft wood)
L. Sierra-Beltran, E. Schlangen (2012)
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16. #1 Specific fibres Synthetic fibres
6 specific papers
 Macro (structural) fibres
Emod ~5000 MPa (~2,5% steel fibres)
Acier
ft ~600 MPa (~50% steel fibres)
 Short/Long term behaviour
Bending
Shear
Temperature
 Predictions
Crack widths
Deflections
Synth.
Ultimate capacity
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17. #1 Specific fibres Synthetic fibres
Synth. Fibres (4,5 kg/m³)
Parmentier et al. (2012)
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18. #1 Specific fibres Synthetic fibres
Shear : synthetic fibres can contribute
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19. #1 Specific fibres Synthetic fibres
Shear
Load [kN]
Min stirrups
Synth. fibres
Deflection [mm]
S. Altoubat et al. (2012)
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20. #1 Specific fibres Synthetic fibres
MC’10 underestimates the shear capacity increase
(rebars + fibres)
+65%
+37%
Without any fibres
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21. Semi-analytical model for shear
Model based on push-through test results
T. Soetens (2012)
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22. #1 Specific fibres Synthetic fibres
Temperature 5
20°C 30°C 40°C
Synth fibres
Creep 2.5
factor Steel fibres
0
0 20 40 60 80
Time [days]
N. Buratti, C. Mazzotti (2012)
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23. #1 Specific fibres Long term behaviour
Creep in bending
K urtz and B alaguru (2000)
K usterle (2007)
M acK ay and Trottier (2004)
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24. #1 Specific fibres Long term behaviour
Flexure Pure tension
B B R I (2010) Guanyu Zhao et al. (2012)
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25. #1 Specific fibres Synthetic fibres
Long term (creep in bending)  7-10 kg/m³ (0,7-1% vol)
 50% fr1
3.0
Creep
factor
Time [days]
T. Kanstad, G. Zirgulis (2012)
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26. #1 Specific fibres Synthetic fibres
Long term (creep in bending)  5 kg/m³ (0,5% vol)
 60% fr1
10
Displacement [mm]
B B R I (2010)
Time [hours] 60
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27. #1 Specific fibres PVA fibres
K. Holschemacher, H. Kieslich (2012)
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28. #2 Recycled mat. & sustainability
 Recycled fibres from scrap tyres
Steel cord as reinforcement
12% in weight
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29. #2 Recycled mat. & sustainability
 Recycled fibres from scrap tyres (workability )
G. Centonze et al. (2012)
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30. #2 Recycled mat. & sustainability
 Recycled fibres
 Environmental impact
Introduction BEFIB 2012 Filtered topics Conclusions A. Fantilli, B. Chiaia (2012)
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31. #2 Recycled mat. & sustainability
 Recycled fibres
 Environmental impact
SCC1 SCC2 NC
Cement 245 245 440
Introduction BEFIB 2012 Filtered topics Conclusions A. Fantilli, B. Chiaia (2012)
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32. Fibre Concrete Design
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33. #3 Special concretes (SCC & UHPC)
SCC : 11 papers
UHPC : 6 papers

SCFRLWAC ???

Self Compacting
Fibre Reinforced
LightWeight Aggregate
Concrete
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34. #3 Special concretes (SCC & UHPC)
UHPC
 Repairing techniques (jacketing)
SIDE
TOP
M. Dagenais, B. Massicotte (2012)
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35. #3 Special concretes (SCC & UHPC)
UHPC
 Repairing techniques (jacketing)
 Truss footbridge (Alicante - 40m span)
Introduction BEFIB 2012 Filtered topics Conclusions J.A. Lopez et al. (2012)
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36. #3 Special concretes (SCC & UHPC)
UHPC
 Repairing techniques (jacketing)
 Truss footbridge (Alicante - 40m span)
Introduction BEFIB 2012 Filtered topics Conclusions J.A. Lopez et al. (2012)
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37. #3 Special concretes (SCC & UHPC)
UHPC
 Repairing techniques (jacketing)
 Truss footbridge (Alicante - 40m span)
Introduction BEFIB 2012 Filtered topics Conclusions J.A. Lopez et al. (2012)
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38. #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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39. #4 Orientation & distribution
SCC panels (splitting) Tests
on notched cores
TOP SIDE
A. Abrimshambaf et al. (2012)
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40. #4 Orientation & distribution
SCC panels
 Fibres tend to orient perpendicular to the flow
A. Abrimshambaf et al. (2012)
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41. #4 Orientation & distribution
SCC panels
 Fibres tend to orient perpendicular to the flow
A. Abrimshambaf et al. (2012)
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42. #4 Orientation & distribution
Distribution
 Use of Carbopol Polymer to compare flow simulations
Introduction BEFIB 2012 Filtered topics Conclusions O. Svec et al. (2012)
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43. #4 Orientation & distribution
Distribution
 Use of Carbopol Polymer to compare flow simulations
 Use of NDT techniques
Orientation
factor
~Inductance
Introduction BEFIB 2012 Filtered topics Conclusions L. Ferrara et al. (2012)
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44. #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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45. Fibre Concrete Design
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46. #5 Design models
The new fib Model Code 2010 integrates FRC
 Compression
 Flexure
 Shear
 Punching
…
Too safe (?)
if characteristic values are used
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47. #5 Design models
From constitutive law to design full-scale structures
1 2
Prediction vs. Exp
4
3 5
R. de Montaignax et al. (2012)
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48. #5 Design models – Inverse analysis
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49. #5 Design models – Inverse analysis
Load [kN]
Test
Pred.
Deflection [mm]
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50. #7 Case-studies & applications
 Poles
 Refractory concrete
 Slabs on grade
 Elevated (flat) slabs
 Pipes
 Footbridges
 Sandwich panels
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51. #7 Case-studies & applications
Flat slabs Casco (The Netherlands)
50 kg/m³ - Spans of 5,6m
 SLS safety 250%
 ULS safety 450%
C. Kleinman et al. (2012)
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52. #7 Case-studies & applications
Flat slabs U. of Minho
 Mid-scale model
 Yield-line theory
Introduction BEFIB 2012 Filtered topics Conclusions J. Barros et al. (2012)
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53. #7 Case-studies & applications
Flat slabs WTCB
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54. #7 Case-studies & applications
Flat slabs WTCB
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55. #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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56. 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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57. BBRI - Lab. Structures
bp@bbri.be
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