Upload
phungbao
View
220
Download
0
Embed Size (px)
Citation preview
LOW ENERGY ASPHALTS LEA ® FOR
SUSTAINABLE ROAD CONSTRUCTION
Olard (presenting author), Beduneau, Fallone
EIFFAGE Travaux Publics , FRANCE
PAPER 142
Miranda Perez
EIFFAGE Infraestructuras , SPAIN
Energetic & environmental stakes
°C kgFuel/T
Hot Mix
HEATING20
15
kgCO2 /T
20 40 60 80 100 120 140 160 180
7
6
5
L Fuel/T
Cold MixAsphalt
Warm Mix Asphalt
Hot Mix Asphalt
VAPORIZATION
DRYINGHalf-WarmMix Asphalt
15
10
5
0
5
4
3
2
1
0
HWMA_LEA ® mixes(50% energy savings)
Traditional HMA productionTotal drying
180°CCoating160°C
Stockage150°C
Application130-140°C
filler bitumen160°C160°C
LEA® process (90°C, covered by 3 patents)� matching any asphalt plant configuration
� enabling energy savings up to 50% (≈3Lfuel/ton of mix)
� enabling a reduction in CO2 emissions to the same extent
(≈9kg CO2 / ton of mix)
Below 100°C, the residual humidity of aggregates makes the bitumen foam
Production on traditional plants
Example of drum mix plant
Key figures
350 road works400 000 tons
Pure & SBS modified binders
France: 30 LEA plantsSpain: 4 LEA plantsPortugal : 1 LEA plantUSA: 3 LEA plantsNew Zealand: 2 LEA plants
Lab evaluation of LEA® performances
- Workability: Nynas workability tester
- Water resistance: Duriez test
Preliminaryselection
optimization
- Compacting ability: Gyratory shear compactor
- Resistance to rutting at 60°C: Wheel tracking test
- Complex modulus test on field cores: IDT
- Fatigue test (optional )
Factorial Experimental Design : Optimization of the moisture resistance i/C
Bitumen aging: Pen after recovery
42
40
45
50
Pen
etra
tion
(1/1
0 m
m)
[Gaudefroy et al., ISAP 08]
Slight aging in the case of LEAs
27
33
35
31 31
20
25
30
35
40
Pen
etra
tion
(1/1
0 m
m)
Fresh bitumen HMA LEA1+A1 LEA2+A1 LEA3+A1 LEA3+A2
Effect of manufacturing process on Emission Potential
Lower Emissions in the case of LEAs
TOC(e) and Emission Potential are lower in the case of HWMAs
Correlation between aging & fume emissions[Gaudefroy et al., ISAP 08]
34
36
38
Pen
etra
tion
(1/1
0mm
)
58
59
60
61
Rin
g an
d B
all T
empe
ratu
re (
°C)
24
26
28
30
32
50 100 150 200 250 300 350 400
Emission Potential (103.mg.s/m3/kg of bitumen)
Pen
etra
tion
(1/1
0mm
)
53
54
55
56
57
58
Rin
g an
d B
all T
empe
ratu
re (
°C)
LEA3
LEA2 LEA1
HMA
Some of our past LEA
road works…road works…
Aerodrome near Béziers (4000T)
AREA Highway A41: Test section 2007(700T with PMB’s)
4000-ton roadwork near Toulouse with up to 50% RAP
⇒ RAP capability
Fumes are overwhelmingly reduced at laydown
What did we learn on the field ?
NY State (USA)
Quick turnover to traffic
What did we learn on the field ?
Less soiling of equipment (plant, truck, paver, shovel)
⇒ reduced use of solvents
What did we learn on the field ?
Improvement of working conditions for workersLess embarrassment for residents as well
What did we learn on the field ?
Conclusions & ProspectsProspects
- Innovative LEA technology + at intermediate temperatures between the current
cold mix and hot mix asphalt techniques+ up to 50% energy savings+ up to 50% energy savings+ with the performance of HMAs
- 400,000 tons since 2005 with either low or high traffic
- Implementation of the process in other countries(validity with other materials, climates & mix design methods)
Thank you for your attention !
http://www.leahttp://www.lea --co.comco.com
Touching is believing….65oC