Abstract
Properly designed and maintained asphalt pavements operate for ten to twenty-five years and have to be rehabilitated after that period. Cold in-place recycling has priority over all other rehabilitation methods since it is done without preheating and transportation of reclaimed asphalt pavement. Multiple researches on the performance of cold recycled mixtures have been done; however, it is unclear how the entire pavement structure (cold recycled asphalt pavement overlaid with asphalt mixture) performs depending on binding agents. The main objective of this research was to evaluate the performance of cold in-place recycled asphalt pavements considering binding agents (foamed bitumen in combination with cement or only cement) and figure out which binder leads to the best pavement performance. Three road sections rehabilitated in 2000, 2003, and 2005 were analysed. The performance of the entire pavement structure was evaluated in terms of the International Roughness Index, rut depth, and pavement surface distress in 2013 and 2017.
Highlights
As reported by the European Asphalt Pavement Association (EAPA), more than 90% of the roads in Europe are surfaced with asphalt mixtures
Road section from 35.300 km to 38.800 km, in which reclaimed asphalt pavement (RAP) was bound with cement in 2003 (L2 and R2), showed the best performance according to International Roughness Index (IRI) in both 2013 and 2017
The highest increase in rut depth irrespective of wheel path and direction was determined for the second road section, in which RAP was bound with cement in 2003 (L2 and R2)
Summary
As reported by the European Asphalt Pavement Association (EAPA), more than 90% of the roads in Europe are surfaced with asphalt mixtures. It means that about 950 billion tonnes of asphalt mixtures are incorporated in the European road network. Cold recycling technology rehabilitates asphalt pavement by recovering and reusing asphalt mixtures from distressed pavement without preheating. It results in less energy consumption and CO2 emission than other rehabilitation techniques (Cross et al, 2011; Thenoux et al, 2007).
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