Annually some 300.000 - 500.000 tons of asphalt are removed from Norwegian roads. Approximately half of this volume is generated by plane milling. The volume of milled asphalt is increasing since milling has become quite a common method for adjusting the road profile and removing ruts caused by asphalt wear.
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Through white paper no 44 (1991-92) from the Norwegian Parliament regarding initiatives to reduce the amount of waste, increased recycling and proper waste treatment and the act of 13th of March 1981 no 6 regarding protection against contamination and about waste, there is a clear commitment to consider recycling of asphalt both from environmental, use of resources and economical considerations. The goal set by the authorities is that a minimum of 75 % of all waste should be either recycled or its energy utilised within 2010. According to the national action plan for construction waste, 70 % of the annually generated construction waste should be recycled by 2005. The control board for recycling of asphalt (KFA) has up to now issued four
annual reports (published in Norwegian), stating that the level of recycling of asphalt on a national basis was over 90%, with a peak at 110% in 2003.
However, it is necessary to improve the
management of reclaimed asphalt, in order to spare high quality material for high quality purposes.
Applications
· Hot recycling in asphalt plant
· Hot recycling on site
· Cold recycling in asphalt plant
· Cold recycling on site
· Recycling of unbound asphalt granulate (mechanically stabilised)
Since the asphalt granulate contains both stone aggregate and binder the economic value is rather high. It is therefore preferable to reuse the asphalt granulate in the upper parts of the road pavement. With relatively simple production equipment it is possible to produce asphalt granulates (cold) that are very well suited for roads with low traffic volumes. Hot mixed recycled materials may also be used on roads with high traffic volumes by producing the material in asphalt plants adjusted for receiving some amounts of asphalt granulate.
Basis for documentation:
- The control board for recycling of asphalt (KFA): Declaration scheme for reclaimed asphalt
- Norwegian Public Roads Administration, manual 018 "Road Construction" and the Code of Practice for Asphalt.
References outside the Norwegian Roads Recycling R&D Program
- Internal report no. 2236 ”Recycling of asphalt – status report” (in Norwegian), published in 2001 by the Road Technology Department, Directorate of Public Roads contains information on gained experience and proposals related to codes of practice for the reuse of asphalt.
- The control board for recycling of asphalt (KFA/DNV) report no. 2003-0183 “Mellomlagring av returasfalt” (”Temporary storage of returned asphalt”)”
- annual reports from the control board for recycling of asphalt (KFA) http://www.asfaltteknisk.no.
Contact: manager of WP4 Recycling of asphalt:
sigmund.dorum@vegvesen.no.
