Abstract
European Union members seek to establish the principles of a circular economy, which is based on the efficient use of raw materials and resources. This requirement will have an impact on business and in particular on the road construction sector. Hence the need to improve the asphalt mixing plant (AMP) mixing technology utilizing as much as possible reclaimed asphalt pavement (RAP) to produce asphalt mixtures (AM) for road construction. The resources used to produce new AM in the world are endless and becoming more expensive in a time scale. The multi-cycle reuse of RAP producing AM is a priority, when thinking about of economical recycling materials usage and the saving of resources. The design and development of RAP hot recycling in-plant technologies has been in progress for approximately half a century. In high-level-economy countries, AM production currently processes on average approx. 80% of the amount of RAP using innovative techniques on AMPs. Design of various AMP, their assessment on the flexible application of innovative techniques depending on the RAP processing method, are described in this paper. In this paper different recycling technologies in AMP and their advantages and disadvantages are reviewed. The research result indicates technical possibilities hot recycling in-plant in Baltic countries. Local authorities, research institutes, road construction and road design companies could use these results in the future.
Highlights
In recent years more and more recycled asphalt road pavements are gaining their new life, influenced on economical, and as environmental background
This paper reviews Recycled asphalt pavement (RAP) recycling possibilities at batch type asphalt mixing plants (AMPs) and most used RAP recycling in-plant method used in Baltic countries application theoretical and practical research
Short overview of total number AMPs and AMPs where possible RAP different recycling methods in-plant in Baltic countries is given in Figure 1, where clearly stated that mostly AMPs are prepared for cold RAP addition method
Summary
In recent years more and more recycled asphalt road pavements are gaining their new life, influenced on economical, and as environmental background. Recycled asphalt pavement (RAP) materials are recyclable cold or hot, in-situ or in-plant, adding them into asphalt mixtures (AM) or mixing with aggregates for road subbase layers. During production process of AM in AMP, virgin resources as aggregates, binder, filler, additives are used. In recent years the industry focus has been placed on increasing the amount of RAP in AM production This is a result of tripled binder costs during the last decade that come at a time of extremely strained funding for road construction and maintenance (Zaumanis et al, 2014). Longer RAP/virgin aggregate mixing times could result in recycled hot asphalt mixtures with higher stiffness modulus and better homogeneity (Nguyen, 2013). Difficulties with production technology have been reported, including excessive emissions (Mogawer et al, 2012)
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