Thoughts on Warm Mix Asphalt production (..among other things!)

Transcription

1 Thoughts on Warm Mix Asphalt production (..among other things!) Even K. Sund Senior Principal Engineer Roads and Traffic Department, Road Directorate

2 Contents of presentation Brief status for road maintenance in Norway (National and County roads Rv + Fv) Paving contracts (NPRA) Environmental requirements in contracts NPRA experiences with Warm Mix Asphalt (only WAM foam ) Conclusions

3 Key data for National roads (Rv) in Norway Key figures for National roads in Norway Length: 27,300 km 10,600 bridges (270 km total) 800 tunnels (780 km total) 350,000 signs 240,000 culverts Annual expenditure (maintenance): 640 million (2008) Annual expenditure (new roads): 1,430 million (2008) Estimated maintenance backlog: 1,750 million (2007) Estimated design related backlog (curvature, width, gradient etc): 58,000 million (2007)

4 Expenditure Maint. & Operations on National roads (RV) (~5 000 mill NOK/year on ~ km) Some of the main areas (2008): Winter 800 mill NOK Pavements Drainage Tunnels Bridges & quays Road furniture etc

5 Maintenance backlog National roads ( km): estimated at almost million NOK (Jan.2008) Walkways and bicycle paths 1,2 % Drainage facilities 7,1 % Tunnels 14,2 % Road foundation 21,6 % Bridges and quays 19,6 % Pavements 16,2 % Road furniture etc 20,2 %

6 Some examples of Maintenance Backlog on the Norwegian Road Network This is bad economy both for the road user and road owner!

7 Length (km) Mill NOK (2007 price level) Expenditure pavements - National roads (Rv) Development of pavement condition on National roads (Rv) Poor Very poor

8 Plan of action for enviromental responsibilty in public procurement ( ) Public sector has a special responsibility to lead by example (procurement for ~250 billion NOK/year) Should use our position to promote environmentally friendly solutions NPRA has started work on how to move forward Policy group with contractor participation intiated 2008 Involves all our procurement, not only pavement materials or energy consumption

9 Panel for Public Procurement Initiated by Dep. of Enviornment Mandate: to advice the public sector and others on how to incorporate environmental aspects in the procurement process Have developed criteria for specific groups of products: Among these are Construction and Buildings The proposed criteria show that this is not an easy field: Quite vague and non-quantifiable Methods for quantifying environmental impact (e.g.lca) still too uncertain to be used in procurement process?

10 PAVEMENTS: In practice many requirements pull in different directions Energy/ LCA Noise Homogenity COSTS Wear Resistance Friction Pavement Colour Dust Deformation Durability Temperature sensitivity

11 Allocation of paving contracts (NPRA) Traditional: NPRA specifies solutions and lowest price gets the contract Performance based= lowest LCC (based on rutting performance) R&D contracts: innovative techniques etc. Challenge: How can we improve our fulfillment of environmental goals without compromising other goals?

12 Contract requirements relevant to use of WMA No formal obstacles to Warm Mix Asphalt Design guide (hb018): Minimum requirement for temperature can deviated from when alternative production techniques are used The challenge is to gain enough experience with WMA so that it is used when appropriate and with acceptable fulfillment of other criteria (e.g. LCC)

13 NPRA s experiences with WAM foam pavements (Source: Geir Berntsen, formerly NPRA Eastern Region) WAM WAM

14 Area (m2) WAM - paved area in Eastern Region Year

15 Ton WAM - Quantity (tons) Year

16 Rut depth (mm) Rv152, Hp3, Km Akershus %-value Mean value WAM Date

17 Rv152 Hp (Wam 2003)

18 Rv152 Hp (Wam 2003)

19 Rv152 Hp (Wam 2003)

20 Rut depth (mm) Rv152, Hp1, Km Akershus ,5 years 90 %-value Mean value 10 WAM 5 10,5 years 0 Date

21 Akershus Rv152 Hp (Wam 2001)

22 Akershus Rv152 Hp (Wam 2001)

23 Akershus Rv152 Hp (Wam 2001)

24 Rut depth (mm) Rv152, Hp7-8, Km 5, , Length km Akershus ,3 mm/year 3,0 mm/year %-value Mean value 10 WAM 5 HAM (Ska 16) 0 Date

25 Akershus Rv152 Hp7/ (Wam 2003)

26 Akershus Rv152 Hp7/ (Wam 2003)

27 Rut depth (mm) 30 Rv152, Hp8, Km , Length km Akershus 90 %-value Mean value WAM 5 Lost 5 year in lifetime 0 Date

28 Akershus Rv152 Hp (Wam 2003) Not much cracking, only rutting

29 Rut depth (mm) Rv152, Hp8, Km Km , Length km Akershus %-value Mean value WAM Lost 3,5 year in lifetime Date

30 Akershus Rv152 Hp (Wam 2003)

31 Rut depth (mm) Fv82, Hp1, Km Km , Length km Akershus %-value Mean value WAM Date

32 Akershus Fv82 Hp (Wam 2001)

33 Akershus Fv82 Hp (Wam 2001)

34 Akershus Fv82 Hp (Wam 2001)

35 Conclusions NPRA is open towards using Warm Mix Asphalt No formal restrictions (Design Guide-Hb018 etc) but... Our (limited) experiences are varied LCC must be acceptable (!) Must be made a win-win situation Our contracting must in the future include environmental criteria in a better way than today (includes a lot more than only pavements)...the question is how?