Abstract
A case study of one trial section in the Pilsen region is presented. The pavement in the section was newly constructed in 2015 using one type of an asphalt concrete mixtures with varying RAP content. The constructed surface course comprises of 0% to 50% RAP. In order to restore the aged binder properties and to avoid the embrittlement of the produced mixtures, a rubber-based modifier/rejuvenator was employed. For technological reasons during manufacturing processes, which engage a parallel drying drum, a crude oil-based rejuvenator was also added. This article contains the preliminary data from an on-going project focused on monitoring the properties of bituminous binders contained in asphalt mixtures. The actual bituminous binders were extracted straight after production, after 6 months and after 12 months. The binder characteristics are evaluated using empirical testing as well as functional tests. Low temperature properties are measured by a Bending Beam Rheometer (BBR). The preliminary results show, that the bituminous binders properties change significantly in a relatively short period of time. The progress in binder’ characteristics is contradictory to up-to date knowledge. The probability that the phenomenon of diffusion between aged binder and rejuvenator agents occurs exists. Moreover, the data might indicate that the process of rejuvenator evaporation takes place.
Highlights
The technology for recycling of asphalt mixtures has been known for several decades [1], but only the development of mixing technologies, production processes and, environmental awareness, has led to its massive expansion [2].In 2015 the Czech Republic produced about 8 million tonnes of virgin asphalt mixtures, whilst 2 million tonnes of asphalt mixtures were available for recycling purposes
If milled material or reprocessed asphalt mixtures from flexible pavements meet the classification criteria according to Czech technical condition regarding recycling material classification (TP 210) and European standards (EN 13108-8), it may be classified as reclaimed asphalt pavement (RAP) that can be reused in the production of hot asphalt mixtures in the asphalt plant
At present in the Czech Republic, the addition of RAP material is only allowed in mixtures of type asphalt concrete, and the maximum allowance is determined in the National Annex to EN 13108-1 Table NA-E-4.5 Asphalt concrete wearing courses can contain up to 25% RAP material
Summary
The technology for recycling of asphalt mixtures has been known for several decades [1], but only the development of mixing technologies, production processes and, environmental awareness, has led to its massive expansion [2].In 2015 the Czech Republic produced about 8 million tonnes of virgin asphalt mixtures, whilst 2 million tonnes of asphalt mixtures were available for recycling purposes. It should be added that despite greater awareness of recycling technology in the Czech Republic, only 16% of the amount of available material is recycled in the production of hot asphalt mixtures. When compared with other EU member states, the Czech Republic lags behind in this respect, even when compared with countries that have a similar or even lower amounts of reclaimed asphalt pavement (RAP) material available: Austria 45%, Denmark 52%, Belgium 64%, and for example Finland 100% [3]. If milled material or reprocessed asphalt mixtures from flexible pavements meet the classification criteria according to Czech technical condition regarding recycling material classification (TP 210) and European standards (EN 13108-8), it may be classified as RAP that can be reused in the production of hot asphalt mixtures in the asphalt plant. For the production of hot asphalt mixtures with a higher content
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