hydrated lime in asphalt mixtures - an international perpective
DESCRIPTION
Presentation made at the British Lime Association (BLA) Lime in Construction’ seminar on Thursday 24th October 2013 at Arsenal’s Emirates Stadium in LondonTRANSCRIPT
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Hydrated Lime in Asphalt Mixtures:
An International Perspective
D. Lesueur - Technical Expert
European Lime Association (EuLA) Civil Engineering Task Force
Lime in Construction: It’s a Game of two Halves
A seminar from the British Lime Association
Arsenal Emirates Stadium – Thursday 24 Oct. 2013BLA Seminar
Hydrated Lime is a Multifunctional Additive that increases Asphalt Mixtures Durability
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Improved mechanical properties
Increased aging
resistance
Increased resistance to moisture
and frost damage Higher
Durability
BLA Seminar
source:
Download critical literature review from www.eula.eu
• 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
~40 Mt/yr of Asphalt Mixtures with Hydrated Lime in the USA
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Lime in all mixesLime in some mixesUnknown
sources:
data: Hicks + Scholtz, NLA 2004
map: E. Berger
BLA Seminar
• 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
~1 Mt/yr of Porous Asphalt with Hydrated Lime in the NL
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sources:
data: Hagos et al., RILEM 2009
Voskuilen + Verhoef, RILEM 2003
picture: www.holland.com
BLA Seminar
• 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)
~400 kt/yr of Asphalt Mixtureswith Hydrated Lime in France
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sources:
data: Raynaud, BTP Matériaux 2009
picture: SANEF
BLA Seminar
• Commonly used in all asphalt mixtures• Wearing and base courses• Rutting resistance
~150 kt/yr of Asphalt Mixtureswith Hydrated Lime in Austria
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source:
AC 32 base 70/100 w/ 3.5% HL (Ka30) after 30,000 cycles at 60°C – Buchta + Kunesh, Gestrata 2005
BLA Seminar
With hydrated lime Without hydrated lime
Hydrated Lime in Asphalt Mixtures from a Sustainable Development Perspective
7BLA Seminar
• 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
An Environmentally Friendly solution
8BLA Seminar
6.5 cm8 cm4 cm
8 cm
4 cm
6.5 cm8 cm
2.5 cm
4 cm 0
0 10 403020 50Years
6.5 cm 6.5 cm
2.5 cm
4 cm
+ 13 cmConstruction Maintenance End of life
8 cm
8 cm
4 cm
6.5 cm
4 cm 0
0 12.5 37.525 50
8 cm
2.5 cm
+ 9 cm
6.5 cm
2.5 cm
Years
Wit
ho
ut
hyd
rate
d li
me
Wit
h 1
.5%
hyd
rate
d li
me
9BLA Seminar
LCA to compare wearing courseswith and without Hydrated Lime
source:
T. Schlegel et al., submitted to RCR 2013
-100 000
-50 000
0
50 000
100 000
150 000
200 000
Classical HMA Classical HMA Modified HMA Modified HMA
Glo
bal W
arm
ing
Pote
ntial
[kg
e CO
2/
FU]
Road construction Road maintenance Recycling of RAP End-of-life Total life cycle
BLA Seminar 10
Global Warming Potential is lower for Hydrated Lime sectionWithout hydrated lime With 1.5% hydrated lime
-23 %
source:
T. Schlegel et al., submitted to RCR 2013
• Hydrated Lime is produced locally
• Less roadworks = less traffic jams• Thanks to increased durability
A Socially Responsible solution
11BLA Seminar
source:
J. Robertson – The Telegraph (www.telegraph.co.uk)
• Cost estimate for wearing course over 50 yrs based on LCA scenario
A Cost-Effective solution
12BLA Seminar
Without hydrated lime
Construction: 8.78 £/m2 Maintenance: 30.09 £/m2
Total: 38.87 £/m2
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)
With hydrated lime
Construction: 9.00 £/m2 Maintenance: 18.29 £/m2
Total: 27.29 £/m2
-30 %
• 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• Socially, Environmentally and Economically
Hydrated Lime is a Sustainable Solution for Long Lasting Asphalt Pavement
13BLA Seminar