Chabot, Armelle

English

Archive Ouverte en Sciences de l'Information et de la Communication

Institut français des sciences et technologies des transports, de l’aménagement et des réseaux
www.ifsttar.fr
High Performance?
Impact of Equivalent Young’s Modulus Ratio Values b/w 
Material Layers on Pavement Structural Fracture Performance
Armelle Chabot
Materials & Structures Department
https://www.lames.ifsttar.fr/
RILEM High Performance Asphalt Materials Symposium
University of Waterloo, Oct. 2nd, 2019
Stiffness of French pavement 
materials
§ Subgrades
§ Unbound materials
• Unbound granular materials
§ Bituminous materials
• Gravel emulsion
• Bituminous concrete (BB)
• Grave Bitume (GB)
• High modulus bit. mix (EME)
§ Hydraulic materials (GC)
• Gravels and Sands treated with HB
• Concrete
200-600
5000
9000
14000
15-30000
24-35000
Modulus range in MPa
20-200
15°C
10Hz
360 
days
3000
2/15
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French Context
(SETRA-LCPC, 1994) 
*Fatigue test
NF EN 12697 - 24
E*eq (15°C, 10Hz); n=0.35
(Burmister, 1943)
- Elastic Multilayers
- 2D axisym.
- Half ∞ space
e
s
Corte JF, Goux MT (1996) Design of pavement structures: the French technical guide. 
Transp Res Rep 1539:116–124
3/15
-2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0
-3.0e+006
-2.5e+006
-2.0e+006
-1.5e+006
-1.0e+006
-5.0e+005
0.0e+000
 
X(m)
sx
x_
(x
,0
,0
.0
01
) (
Pa
)
sxx 30° viscoélastique 0.001
sxx 15° viscoélastique 0.001
sxx 15° élastique 0.001
… But for top layers ?
x
BB
GNT (E=400 MPa, n=0.35)
Tension 
stress
Sol (E=50 MPa, n=0.35)
V
32500 N
Msc. (Senti, 2007)
(Tamagny et al., CP2004)
Lateral loadings
DEVIN PROJECT
INRETS - LMT Cachan - SMIT/LCPC
(Hammoum et al., 2010)
Hammoum F., Chabot A., St. Laurent D., Chollet H., Vulturescu B. (2010). Accelerating and Decelerating 
Effects of Tramway Loads moving on Bituminous Pavement. Materials and Structures, 43:1257-1269
Shear
stresses
4/15ViscoRoute©(LCPC,2009) simulations
Grellet et al. (CP2012)
+
ØGood performance:
üHigh Young modulus à Fatigue /Rutting ok
üUsed for heavy traffic or bus way
Ø But need
üGood soil
üThickness design value
§ Correct traffic hypothesis
üConstruction care: Cst % of void 
and good bond between layers
EME2 uses & limitations?
SOIL
5/15
Bending case with Discontinuities
and climate change 
6/15
F/2F/2
2
1
SOIL
Dedicated pavement analysis
Tran PHD thesis (2004)  & Nasser PHD thesis (2016) 
Chabot, A., Tran Q. D., Ehrlacher A., 2007. A modeling to understand where a vertical crack can propagate in
pavements. In Proc. Advanced Characterization of Pavement and Soil Engineering Materials, 1: 431-440.
Nasser H., Chabot A., 2018. A Half-analytical Elastic Solution for 2D Analysis of Cracked Pavements.
Advances in Engineering Software, 117: 107-122.
Interface 2,3 
Shear stress 
1 2
Interface 2,3 
Normal stress 
3
x
z
ν1,2 (x) =σ zz x,h1
+( ) =σ zz x,h2−( )
ν 2,3(x) =σ zz x,h2
+( ) =σ zz x,h3−( )
M4 Chabot (1997)
Pouteau (2004)
Dedicated M4-5nW analysis
≠T°C à Effect of ≠ E Ratio on Interface stresses
Nasser H., Chabot A., 2018. A Half-analytical Elastic Solution for 2D Analysis of Cracked Pavements. 
Advances in Engineering Software, 117: 107-122. 
8/15
1 2 3∼0,5 MPa
ν1,2 (x) =σ zz x,h1
+( ) =σ zz x,h2−( )
ν 2,3(x) =σ zz x,h2
+( ) =σ zz x,h3−( )
Interface 2,3 
Normal stress
(zoom) 
Debonding?
9/15
Petit C., Chabot A., Destrée A., Raab C, 2018. Recommendation of RILEM TC 241-MCD on 
Interface Debonding Testing in Pavements. Materials and Structures, 51 (4): article 96
I
IIRolling path
Cold T°C
à 3 materials? Hot T°C: Ecc>>Eac
Why? When?
Chabot A., Pouteau B., Balay J.-M., De Larrard F., 2008. FABAC Accelerated Loading Test of 
Bond between Cement Overlay and Asphalt layers. RILEM CP2008, June 16-18, Chicago, US. 
Essais Fabac
Bond ALT for urbain French roads
Pouteau PHD thesis (2004)
10/15
F/2F/2
2
1
A B C D
Chabot  A., Hun M., Hammoum F., 2013, Mechanical analysis of a bond test
between layers of composite pavements, CBM, 40:1076-1088
-0.50
0.00
0.50
1.00
1.50
2.00
2.50
3.00
3.50
4.00
-3.00
-2.50
-2.00
-1.50
-1.00
-0.50
0.00
0.50
1.00
1.50
70 140 210 280 350
1,
2
(M
P
a)
11
,2
(M
P
a)
x (mm)
E2/E1=1
E2/E1=3
E2/E1=5
E2/E1=20
0.00
0.50
1.00
1.50
2.00
2.50
3.00
0 70 140 210 280 350 420
xx
 (x
,e
1 )
 (M
P
a)
x (mm)
E2/E1=1
E2/E1=3
E2/E1=5
E2/E1=20
A B C D
A
B C
B C
D
t ns
Bending case: geometry & E2/E1
Hun PHD thesis (2012)
11/15
Interface 1,2 
stresses 
Tension 
stress at 
the
Bottom of 
layer2
shear
normal
High performance of 
bituminous materials…
- Loading conditions?
- With other layers?
- New pavement geometries?
	
Ó Solar RoadWays 12/15
Charging Unit
(CU) slab
eRoad
One Geometrical 
Solution proposed 
by KTH (Chen, PHD 2016)
(Chen et al., 2018)
Chen, F., Balieu, R., Cordoba, E., & Kringos, N. (2018). Towards an understanding of the structural 
performance of future electrified roads: A finite element simulation study. IJPE, 20 (2): 204-215.
13/15
eRoads examples
14/15
Chabot A., Deep P., 2019. 2D Multilayer Solution for an Electrified Road with a built-in 
Charging Box. RMPD, 20 (sup2), s590-s603.
High Bond Performance Needs!
eRoad composite system 
(Chabot & Deep, 2019)
Thanks!
https://apt2020.sciencesconf.org/   à Registration open! 
15/15
S1 - tridem- transversal strain at bottom of RBA
-40
-20
0
20
40
60
80
100
120
140
160
43 45 47 49 51 53
distance (m)
st
ra
in
 (
st
ra
in
)
gage T1
ALIZE
VISCOROUTEextension
Multi-axle loads
ALT vs visco-elastic calculus
(Kerzreho et al., 2012)
Kerzrého J.P., Hornych P., Chabot A., Deloffre L., Trichet S., Coirier G., Gouy T, 2012. Evaluation of the 
aggressiveness of different multi-axle loads using APT tests. In Advances in Pavement Design through Full-scale 
Accelerated Pavement Testing. Jones, D., Harvey, J., Al-Qadi, I. and Mateos, A. (Eds): 505–517.


Impact of Equivalent Young’s Modulus Ratio Values between Material Layers on Pavement Structural Fracture Performance

https://hal.archives-ouvertes.fr/hal-02307697/file/Symposium-Waterloo-AC_25-09-19-Red.pdf

Impact of Equivalent Young’s Modulus Ratio Values between Material Layers on Pavement Structural Fracture Performance

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Archive Ouverte en Sciences de l'Information et de la Communication