Hot recycling of asphalt at a central plant: a general quality control process and long term follow up results: Swedish case studies

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This notat aims to highlight the various demands on hot recycling of asphalt at a plant and to study how the recycled asphalt mixtures differ from the new one and how much asphalt granules that can be mixed without affecting the pavement performance negatively. The report presents a translation from Swedish to English of already published reports on hot recycling of asphalt in Sweden. Hot recycling at a central plant is a technique that has increased in popularity over the past years and today there are large numbers of asphalt recycling plants adapted for hot recycling in Sweden. In case of hot recycling plants, 10–50 percent of asphalt can be recycled depending on the plant type, method of recycling, type of the manufactured mixture, traffic volume and quality of the old asphalt pavement, etc. Recently, new recycling methods have been developed to enable 90–100 percent reclaimed asphalt (RA) involvement by continuous hot mix recycling. Correspondingly, the report presents results of tests carried out on the binder layer (ABb) of road 40 and surface course (ABS) of road 42, Västergötland. Research has been carried out on mixes and test sections to cover quality control of RA, stone materials in asphalt, binder content, particle size distribution and voids in asphalt, analysis of recycled binders and mechanical properties of asphalt.

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