hrvatsko asfaltersko društvo croatian asphalt association .... e le bouteiller_asfalti visokih...
TRANSCRIPT
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Hrvatsko asfaltersko društvo Croatian asphalt association
Asfalti visokih modula: francuska iskustva High Modulus Asphalt: the French Experience Étienne le Bouteiller – COLAS S.A. Međunarodni seminar ASFALTNI KOLNICI 2016 International seminar ASPHALT PAVEMENTS 2016 Opatija, 06.–07. 04. 2016.
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CONTENT Background Mix design Pavement design: road pavements Pavement design: airport pavements Manufacturing and placing Developments Conclusions
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BACKGROUND 1980 A COLAS invention GBTHP Very high performance road
base asphalt E* = 16000 Mpa (15°C 10 Hz) ε6 = 160 10-6 µs (10°C 25 Hz)
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BACKGROUND 1988 Technical advice GBTHP Very high performance road
base asphalt E* = 16000 Mpa (15°C 10 Hz) ε6 = 160 10-6 µs (10°C 25 Hz)
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BACKGROUND Oct. 1992 French Standard NF P 98140 Updated in Nov.1999
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BACKGROUND Oct. 1992 French Standard NF P 98140 Updated in Nov.1999 2 types of EME Focus on EME2:
E* > 14000 Mpa (15°C 10 Hz) ε6 > 130 10-6 µs (10°C 25 Hz)
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BACKGROUND A few words about the French asphalt mix design
method 4 levels of performance based tests
Water resistance Resistance to permanent deformation Stiffness modulus E* Fatigue resistance ε6
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BACKGROUND A few words about the French asphalt mix design
method 4 levels of performance based tests
Water resistance Resistance to permanent deformation Stiffness modulus E* Fatigue resistance ε6
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BACKGROUND A few words about the French asphalt mix design
method 4 levels of performance based tests
Water resistance Resistance to permanent deformation Stiffness modulus E* Fatigue resistance ε6
10
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BACKGROUND Water resistance EN 12697-12 Compressive strenght on core after 8 days of
immersion
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BACKGROUND Resistance to permanent deformation : EN 12697-22 Determination of rut depth
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1
10
100 1000 10000 100000
Nombre de cycles
orni
ère
en %
plaque 1
plaque 2
Moyenne
Régression
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BACKGROUND Stiffness modulus E* EN 12697-26 Sinusoidal dynamic deflexion15°C 10 Hz Direct tension 15°C 0.02 s
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BACKGROUND Fatigue resistance (EN 12697-24) Determination of strain level for 1 million cycles
ε6 (10°C 25 Hz)
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BACKGROUND 1994 The French Design Manual for
Pavement Structures
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BACKGROUND 1994 The French Design Manual for
Pavement Structures English version in 1997
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BACKGROUND 1997 An updated Avis Technique COLBASE S
E* = 16000 Mpa (15°C 10 Hz) ε6 = 145 10-6 µs (10°C 25 Hz)
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BACKGROUND 1998 The French guide for new pavement structure
(SETRA/LCPC)
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BACKGROUND 1998 The French guide for new pavement structure
(SETRA/LCPC)
Road base asphalt : 21 cm
EME: 15 cm - 29%
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BACKGROUND 2008 European Standard EN
13108-1 EME2
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MIX DESIGN An appropriate combination of
Aggregates Bitumen
An appropriate gradation The standard does not provide with any specification The main aim is to reach a dense mix: void content
between 3 & 6% when tested with the gyratory compactor (80 to 120 revolutions depending on the maximum aggregate size)
An appropriate bitumen A « hard » bitumen A high bitumen content
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MIX DESIGN The characteristics of the bitumen will provide
the mix with its modulus (and rutting resistance) The bitumen content will provide the mix with its
fatigue properties (and water resistance)
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0
5000
10000
15000
20000
25000
0 50 100 150
Mod
ulus
of t
he m
ix [M
Pa]
15°C
10
Hz
(2PB
-TR
)
Modulus of the binder [MPa] à15°C - 10Hz (DSR)
MIX DESIGN Basically, the stiffness E* of the mix will depend
on the stiffness G* of the binder A 10/20 might be suitable (e.g. Netherland) A 10/20 might not be suitable (e.g. Cesch Rep.) A 20/30 might be suitable (e.g. South Africa)
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MIX DESIGN Basically, the stiffness modulus of the mix will
depend on the stiffness of the binder A 10/20 might be suitable (e.g. Netherland)
Pen 19 G* 82 MPa A 10/20 might not be suitable (e.g. Cesch Rep.)
Pen 18 G* 35 MPa A 20/30 might be suitable (e.g. South Africa)
Pen 28 G* 80 MPa Bitumen used for EME:
Straight run bitumen (e.g. Netherland) Propane bitumen (e.g. South Africa) Blown bitumen (e.g. Australia)
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MIX DESIGN Basically, the stiffness modulus of the mix will
depend on the stiffness of the binder A 10/20 might be suitable (e.g. Netherland) A 10/20 might not be suitable (e.g. Cesch Rep.) A 20/30 might be suitable (e.g. South Africa) A (SBS) modified bitumen will provide the mix
with improved fatigue resistance
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MIX DESIGN A summary of this history
GB2 GB3 GB4 EME1 EME2
E* (Mpa) 9000 9000 11000 11000 14000
Ɛ6 (µs) 80 90 100 100 130
Binder pen ↓ Binder content ↑ Pavement thickness↓
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time
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PAVEMENT DESIGN: ROAD PAVEMENTS How to make the best use of the characteristics
measured in the laboratory taking into account the actual service conditions?
?
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PAVEMENT DESIGN: ROAD PAVEMENTS How to make the best use of the characteristics
measured in the laboratory taking into account the actual service conditions?
1st step
εt
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PAVEMENT DESIGN: ROAD PAVEMENTS How to make the best use of the characteristics
measured in the laboratory taking into account the actual service conditions?
2nd step
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PAVEMENT DESIGN: ROAD PAVEMENTS How to make the best use of the characteristics
measured in the laboratory taking into account the actual service conditions?
2nd step
εt < εt,ad
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εz < εz,ad
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PAVEMENT DESIGN: ROAD PAVEMENTS PF3: 120 Mpa TC6: 6,5 to 17,5 ESAL t°: 15°C
Road base asphalt : 21 cm
EME: 15 cm - 29%
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PAVEMENT DESIGN: ROAD PAVEMENTS In France, EME is a commonly used technique A technique that is used for both new
construction and strengthening works The main difficulty is to source appropriate
bitumen at an acceptable cost A major site: the « tamarin road » in the Réunion
Island (Indian Ocean)
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PAVEMENT DESIGN: ROAD PAVEMENTS A major (and exotic)
reference: the « tamarin road » in the Réunion Island (Indian Ocean)
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PAVEMENT DESIGN: ROAD PAVEMENTS A major (and exotic)
reference: the « tamarin road » in the Réunion Island (Indian Ocean) 200,000 T of EME Basaltic local aggregates (high
specific gravity) Impact of the porosity: part of
the bitumen is not « active » B 20/30 from Engen (South
Africa) Impact of the binder content
5.8%: 128 µs 6.2%: 132 µs
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PAVEMENT DESIGN: AIRPORTS In France, airport pavement design has been
based on the use of structural numbers Structural numbers:
Bituminous concrete 2.0 Road base asphalt (GB) 1.5 Crushed graded material 1.0 (reference)
Structural numbers for « new » materials EME 1.9 BBME 2.5
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PAVEMENT DESIGN: AIRPORTS Road base asphalt (GB) 1.5 EME 1.9
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GB Crushed graded material EME
10 cm x 1.5 = 15 cm : 1.9 = 7.9 cm
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PAVEMENT DESIGN: AIRPORTS Use on CDG (Paris) airport in 2002: runway 2
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PAVEMENT DESIGN: AIRPORTS An existing concrete pavement Pavement design:
Linking concrete slabs 2 cm SAMI: PMB sand asphalt 7 cm EME (B20/30) 6 cm BBME (PMB) high modulus asphalt concrete
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MANUFACTURING AND PLACING Nothing very specific compared to conventional
asphalt mixes Manufacturing temperature: 160 to 190°C Placing and compaction:
High bitumen content may lead to fating up Specific care to the joints The use of RAP eases compaction Aim a low void content (spec: < 6%)
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MANUFACTURING AND PLACING First warm EME has
been used in Dec. 2007 (city of Meaux)
Morning temperature: -1°C
Manufacturing temperature: 140°C
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MANUFACTURING AND PLACING A (warm) thin overlay was placed on the EME
base course
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DEVELOPMENTS (OUTSIDE FRANCE) Preliminary remark: Pavement design methods vary (empirical,
rationnal, combination) Testing methods vary Local conditions vary
Temperature, axle load, traffic
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DEVELOPMENTS (OUTSIDE FRANCE) Example: modulus assessment
Appendix B 20°C 8Hz 3-4 PB-PR
Appendix C 20°C 124ms
IT-CY
Appendix D 15°C 0.02s
DTC-CY
Sinusoidal dynamic deflection Impulsion Direct Tension
Appendix A 15°C 10 Hz
2 PB-TR
Umatta MAER
Correlation between value
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DEVELOPMENTS (OUTSIDE FRANCE) Local assessment needs to be made:
Testing methods Performances
Example in South Africa: testing methods
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DEVELOPMENTS (OUTSIDE FRANCE) Local assessment needs to be made:
Testing methods Performances
Example in South Africa: performances
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DEVELOPMENTS (OUTSIDE FRANCE) Local assessment needs to be made:
Pavement design Example in the United Kingdom
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DEVELOPMENTS (OUTSIDE FRANCE)
DBM50 : 320 mm
EME 2 : 260 mm
Same Traffic and subgrade
- 60 mm
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DEVELOPMENTS (OUTSIDE FRANCE) Poland Morocco
First worksite in 2000 Often used on highways Mix design includes RAP 25%
Australia Mauritius
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DEVELOPMENTS (OUTSIDE FRANCE) O
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DEVELOPMENTS (OUTSIDE FRANCE) Mauritius
Several road projects since 2010 Triolet bypass
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DEVELOPMENTS (OUTSIDE FRANCE) Mauritius
SSR international airport
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DEVELOPMENTS (OUTSIDE FRANCE) Mauritius
SSR international airport Runway overlay and parallel taxiway works
Owner: Airports of Mauritius Engineer: Jacobs (UUK) and Gibb (Mauritius)
Design system: FAARFIELD Alternatives main goal: to save materials Basic design (new taxiway)
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DEVELOPMENTS (OUTSIDE FRANCE) Basic design (new taxiway) Alternative design
105 mm thickness saving
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•Cement Bound Granular •Base
•Binder course EME 0/14
•Marshall Asphalt 0/14
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CONCLUSIONS EME is a fully reliable technique that has been
used for more than 20 years Developments outside France have confirmed its
efficiency The selection of the right binder is a crucial issue Development should include a careful study of its
mechanical characteristics, to be used in the pavement design model
All of you are more than welcome to visit our main lab facilities and worksites in progress
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