EUROPEAN ASPHALT EXPERIENCE. Christophe Denayer Chairman European Lime Association Civil Engineering Task Force

Transcription

1 EUROPEAN ASPHALT EXPERIENCE Christophe Denayer Chairman European Lime Association Civil Engineering Task Force

2 EuLA Civil Engineering Task Force London - 16 th of November 2017 Chairman EuLA Civil Engineering TF christophe.denayer@carmeuse.com 1

3 1. EuLA 1. EuLA Members (20 EU-countries 13 associations)

4 EuLA Structure Civil Engineering TF General assembly Board Bureau Technical & Environment Committee + task forces Lime Application Committee + task forces Standardisation committee + ad hoc groups Task Force CIVIL ENGINEERING 1. EuLA SOIL TREATMENT ASPHALT

5 2. A little bit of history ASPHALT Numerous applications (1970s) NCHRP Survey ( ) National Lime Association (NLA) Actions (1984+) History 75

6 A little bit of history ASPHALT Numerous applications (1970s) NCHRP Survey ( ) National Lime Association (NLA) Actions (1984+) Import of US recipes (asphalt rubber / porous asphalt) Belgium (1980) France (1984) Netherlands History 76

7 A little bit of history Numerous applications (1970s) NCHRP Survey ( ) National Lime Association (NLA) Actions (1984+) Import of US recipes (asphalt rubber / porous asphalt) Belgium (1980) France (1984) Netherlands European Lime Association (EuLA) Actions Start of Civil Engineering TF History 7

8 The Dutch experience Dutch Road Administration specifies 2 % Hydrated Lime in Porous Asphalt 90 % of highways/main roads Rijkswaterstaat w/ PA (= ZOAB ) Why PA? Safety (and noise reduction) Lifetime : 11Y (right lane) 17Y (left lanes) No HL = premature stripping bitume 70/100 Aggregates (PSV > 58) Mixed fillers (EN 13043) sources: data: Hagos et al., RILEM 2009; Voskuilen + Verhoef, RILEM 2003; picture: 2. History 78

9 and French experience French Highway Agency (SANEF) specifies 1.5 % Hydrated Lime in all wearing courses All mixtures (AC, PA, BBTM ) since 2004 Maintenance operations from 12 to 14 yrs (~+20-25% increase of durability) thanks to HL addition sources: data: Raynaud, BTP Matériaux 2009; picture: SANEF 2. History 79

10 3. Mechanisms of hydrate lime in asphalt Increased resistance to moisture and frost damage Longer lasting durability Improved mechanical properties Increased aging resistance source: critical literature review from 3. Mechanisms 80

11 «all in one» - synergetic benefits of hydrate 1. Hydrate is an excellent «anti-stripping» agent 2. Hydrate stiffens the HMA, increasing the «rutting resistance» 3. Hydrate interacts with aggregate surface 4. Hydrate is an inhibitor for aging or «oxydation» 5. Hydrate will create a better resistance to low temperature cracking Mechanisms 81

12 American publications 3. Mechanisms 82

13 4. Research : Status 2008 Mechanisms Quantification Method 1. Use in Europe today? Austria successful 2. Critical Literature Review (D. Lesueur & All) Scientific Papers on : What Evidence? What Mechanisms? 3. Quantification Method V. Mouillet & All (LRPC) 4. E&E 2012 Istanbul 4 Publications : E&E Posters Research

14 Research => gaps on know-how 1. Evaluation of the Effects of Lime on Workability of Open Graded and SMA Mixtures (A. Marradi & All Pisa Univ.) comparison fibers/lime 2. Lime as additive for increased durability of asphalt mixes even after recycling (HJ. Ritter & All KOAC) 3. Influence of hydrated lime on the field performance of SMA10 mixtures containing PMB (S. Vansteenkiste & All BRRC) see next slide Research Today 84

15 Example field performances test-sections (BRRC) Aéropôle d Heppignies Rue Muturnia Contractor : Wanty s.a. Size of the building site : 2 x 1,2 km new Access road for Brussels South Airport Wearing coarse : SMA Research EuLA m section build : standard bitumen (B50/70) m section build : standard bitumen with hydrated lime m section build : polymer modified bitumen (PmB 45/80 50) m section build : polymer modified bitumen with hydrated lime 85

16 5. Life Cycle Assessment - System Boundaries Cradle (extraction) to end of life (road) 5. LCA 86

17 Life span between maintenances + 13 cm Construction Maintenance End of life Classical HMA has a life span of the surface layer of 10y Without hydrated lime 0 8 cm 2.5 cm 8 cm 4 cm 4 cm 6.5 cm 2.5 cm 8 cm 4 cm 4 cm 6.5 cm 6.5 cm 6.5 cm Years Modified HMA (+1.5% lime) has a life span of 12.5y due to the increases the life span by 25% 5. LCA With 1.5% hydrated lime 0 8 cm 2.5 cm 8 cm 4 cm 4 cm 6.5 cm + 9 cm 2.5 cm 8 cm 6.5 cm Years 87

18 Assumptions Following assumptions are made for the: 1. Recycling of the Reclaimed Asphalt Pavement (RAP): 50% of the RAP reused for the production of new HMA (replacement of virgin bitumen, sand, gravel and filler) 50% of the RAP reused as sand / gravel for external uses (substitute to sand / gravel) 2. End-of-life of the road (50 years): The asphalt layers will not be removed The surface layers do replace the sub base layer of the future new road 5. LCA 88

19 Global Warming Potential (CO 2 ) 23% reduction Without hydrated lime With 1.5% hydrated lime Global Warming Potential [kg e CO 2 / FU] Classical HMA Classical HMA Modified HMA Modified HMA Road construction Road maintenance Recycling of RAP End of life Total life cycle 5. LCA Source : Schlegel T. & All : The limits of partial life cycle assessment studies in road construction practices: A case study on the use of hydrated lime in Hot Mix Asphalt. Transportation Research Part D: Transport and Environment. Volume 48, Pp Open access. 89

20 6. Promotion at international events with booth Eurobitume & Eurasphalt 2012 in Istanbul 4 Publications 2 Posters Eurobitume 2016 (Prague) Eurobitume 2012 (Istanbul) PROMOTION Eurobitume & Eurasphalt 2016 in Prague 3 Publications 2 Posters Today 90

21 Main promotional events 2017 Papers, oral presentation, Round Table, International Symposium Energy Challenges and Mechanics: Energy August in Manchester, UK Belgian Road Conference 4-6 October Brussels British Lime Association event 16 November - London Czech Road Conference November Ceske Budjejovice EuLA-Scientific Round Table 6 October University Nottingham Prof. Gordon Airey 6. PROMOTION Univ. Nottingham 27 asphalt experts 13 Industry 91

22 Free access - «asphalt» 6. PROMOTION 92

23 7. Conclusion benefits of hydrate 1. Moisture resistance even for harsh conditions 2. Oxidation resistance 3. Mechanical performances 4. Longer lifespan for roads 5. Reduced maintenance need 6. Less traffic jams (works) 7. Reduced CO2-footprint 8. Science development 7. CONCLUSION 93