Presentation made at the British Lime Association (BLA) Lime in Construction’ seminar on Thursday 24th October 2013 at Arsenal’s Emirates Stadium in London

1. Hydrated Lime
in Asphalt Mixtures:
An International Perspective
D. Lesueur - Technical Expert
European Lime Association (EuLA) Civil Engineering Task Force
didier.lesueur@lhoist.com
Lime in Construction: It’s a Game of two Halves
A seminar from the British Lime Association
Arsenal Emirates Stadium – Thursday 24 Oct. 2013
BLA Seminar
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2. Hydrated Lime is a Multifunctional Additive
that increases Asphalt Mixtures Durability
Increased
resistance
to moisture
and frost
damage
Improved
mechanical
properties
Higher
Durability
Increased
aging
resistance
source:
Download critical literature review from www.eula.eu
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3. ~40 Mt/yr of Asphalt Mixtures
with Hydrated Lime in the USA
• According to DOTs, 1-2 % Hydrated Lime
• Increases wearing course life by up to 10 yrs
• Otherwise 4-20 yrs = 20-50 % increase in
durability
sources:
data: Hicks + Scholtz,
NLA 2004
map: E. Berger
Lime in all mixes
Lime in some mixes
Unknown
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4. ~1 Mt/yr of Porous Asphalt
with Hydrated Lime in the NL
• Dutch Road Administration specifies 2 %
Hydrated Lime in Porous Asphalt
• > 70 % of highways w/ PA
• 11 yrs durability w/ 70/100 bitumen
• No HL = premature stripping
sources:
data: Hagos et al., RILEM 2009
Voskuilen + Verhoef, RILEM 2003
picture: www.holland.com
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5. ~400 kt/yr of Asphalt Mixtures
with Hydrated Lime in France
• French Highway Agency (SANEF) specifies
1.5 % Hydrated Lime in wearing courses
• All mixtures (AC, PA, BBTM…) since 2004
• Maintenance operations from 12 to 14 yrs
thanks to HL addition (20-25% more durability)
sources:
data: Raynaud, BTP Matériaux
2009
picture: SANEF
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6. ~150 kt/yr of Asphalt Mixtures
with Hydrated Lime in Austria
• Commonly used in all asphalt mixtures
• Wearing and base courses
• Rutting resistance
Without hydrated lime
With hydrated lime
source:
AC 32 base 70/100 w/ 3.5% HL (Ka30)
after 30,000 cycles at 60 C – Buchta +
Kunesh, Gestrata 2005
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7. Hydrated Lime in Asphalt Mixtures from a
Sustainable Development Perspective
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8. An Environmentally Friendly solution
• EuLA requested a LCA for Hydrated Lime in
Asphalt Mixtures
•
•
•
•
Independent consulting company
ISO 14040 compliant
Critical review by TNO (Utrecht, NL)
Functional Unit: 1 km of wearing course (3.5 m
width) for 50 yrs (= lifespan of the road)
• Based on published LCA by French Road
Contractors Association (USIRF)
• Bilal et al., RGRA 2008
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9. Without hydrated lime
LCA to compare wearing courses
with and without Hydrated Lime
Construction
+ 13 cm
Maintenance
End of life
4 cm
2.5 cm
4 cm
0
2.5 cm
8 cm
6.5 cm
6.5 cm
6.5 cm
6.5 cm
4 cm
8 cm
8 cm
4 cm
source:
T. Schlegel et al.,
submitted to RCR
2013
With 1.5% hydrated lime
Years
0
10
20
30
40
50
+ 9 cm
2.5 cm
4 cm
0
2.5 cm
4 cm
8 cm
8 cm
6.5 cm
8 cm
6.5 cm
Years
0
12.5
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37.5
50
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10. Global Warming Potential is lower for
Hydrated Lime section
Without hydrated lime
With 1.5% hydrated lime
200 000
Global Warming Potential [kg e CO2 / FU]
150 000
100 000
-23 %
50 000
0
Classical HMA
Classical HMA
Modified HMA
Modified HMA
-50 000
-100 000
source:
Road construction
Road maintenance
Recycling of RAP
End-of-life
Total life cycle
T. Schlegel et al.,
submitted to RCR
2013
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11. A Socially Responsible solution
• Hydrated Lime is produced locally
• Less roadworks = less traffic jams
• Thanks to increased durability
source:
J. Robertson – The Telegraph
(www.telegraph.co.uk)
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12. A Cost-Effective solution
• Cost estimate for wearing course
over 50 yrs based on LCA
scenario
Without hydrated lime
With hydrated lime
Construction: 8.78 £/m2
Maintenance: 30.09 £/m2
Construction: 9.00 £/m2
Maintenance: 18.29 £/m2
Total: 38.87 £/m2
Total: 27.29 £/m2
-30 %
Cost sources:
Asphalt: French 2009 national survey (SETRA)
Tack coat + milling: 2009 average price in Western France (CETE Ouest )
Hydrated lime and asphalt filler: www.indexmundi.com 2011 and 2010
Asphalt mixture (55.53 €/t = 46.65 £/t)
Asphalt mixture with HL including silo amortization (56.99 €/t = 47.95 £/t)
Tack Coat (0.23 €/m2 = 0.19 £/m2)
Milling (4.04 €/m2 = 3.39 £/m2)
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13. Hydrated Lime is a Sustainable Solution for
Long Lasting Asphalt Pavement
• A multifunctional additive…
• Improved moisture and frost resistance
• Slower bitumen ageing
• Better mechanical properties
• …increasing the durability of asphalt
pavement…
• Road managers talk about 25% more durability
• …in a sustainable way
BLA Seminar
• Socially, Environmentally and Economically
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