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Temporary storage of asphalt for recycling, Viberg
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The authorities have set a target that at least 75 % of all waste should be recycled (Parliament statement no. 8 1999-2000). In order to comply with this intension the asphalt business sector has set its own target to recycle at least 80 % of removed asphalt within 2005. The control board for recycling of asphalt, KFA (www.asfaltteknisk.no), established in order to monitor that this target will be achieved, registered in 2001 that 95 % of milled/removed asphalt was reused for various purposes. In 2003 the amount of recycled asphalt was increased to 110 % on a national basis. It turned out, however, that the amount of recycled warm asphalt was low. The recycling level in 2004 was somewhat lower, 89%.
WP 4 has chosen to give priority to the following activities:
1 Monitoring of existing field tests
where the main goal is to obtain experience from monitoring road sections where recycling of cold asphalt has been used.
4-2 Material properties and requirements (laboratory/field) particularly for cold recycling
Main goals:- Test various laboratory methods in order to modify the properties of cold recycled asphalt on site- Produce a mix design system for cold recycling. Of main importance will be to adjust the sample preparation and conditioning procedures in order to simulate in the best possible way what is obtained on the road. The test methods should also take into account of the durability aspects. Potential test methods that may be applied are Cantabro and Wheeltrack.
4-3 Field tests with unbound asphalt granulate
Main goal:- Obtain experience with test sections where unbound asphalt granulate have been utilisedTests have been performed with falling weight deflectometer and E-values have been calculated on tests sections where 0-50 mm and 0-25 mm have been used.
4-4 Specification of material processing including necessary declarations
Mail goal:- Utilise recycled asphalt for high quality purposes.
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Road with reclaimed asphalt pavement, Storidalen
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Mapping of material flow in connection with recycling of asphalt has been performed and the available information will be processed in order to provide specifications for optimal material flow depending on local conditions. In this connection a draft document has been produced regarding the possibilities for increased use of recycled asphalt in hot mix plants. The challenge here is the cost-benefit equation depending on the volume of recycled asphalt available at the various plants and possible service charges/support systems.
In order to obtain the best possible utilisation of materials the project will also analyse the logistics connected to recycling and in this way stimulate an increased use of warm recycling. Recycling of asphalt will constitute one part of the guidelines included in the revised Handbook 018 Road Construction. These guidelines will replace the Asphalt Guidelines since the Norwegian Asphalt Society will not publish a new version of its guidelines. Results from project task DP4 will form some of the basis for the guidelines included in Handbook 018.
Project task WP 4 has been in contact with regional road offices and different research institutions. On the contractor side KoLo-Viedekke and Mesta have participated.
