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Title
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Aging of rejuvenated RAP binder : a RILEM inter-laboratory study
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Author
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Abstract
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| The growing use of reclaimed asphalt (RAP) results in a continuous increase in the percentage of added RAP to hot mix asphalt. Within the asphalt pavement, the asphalt binder is the component which is affected the most by the ageing during service life, resulting in considerable hardening of the RAP binder. Therefore, the aged binder needs to be reactivated to meet the requirements for new asphalt mixtures. For high recycling amounts above 50%, often rejuvenating agents have to be added when no conventional binders are available with the required low viscosity. Such additives are of very different chemistry reflecting the base materials used in production which includes petroleum-based oils, but more often side products from industrial process which are very different from bitumen. Consequently, the ageing behaviour may differ from that of pure bitumen, which has been observed already in a number of pavement construction sites. For this reason, the RILEM task group 3 of Technical Committee (TC) RAP decided to examine the ageing behaviour of bitumen rejuvenator blends in more detail. An extracted RAP binder was mixed with varying amounts of virgin bitumen and a rejuvenating agent to simulate different amounts of RAP concentrations in the hot mix. These binder blends were next subjected to laboratory short and long term ageing. At every stage, defined target characteristics have been determined using complex modulus, penetration value, softening point ring and ball, and low temperature creep stiffness. The first results of this research effort are presented in this paper. |
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Language
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English
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Source (book)
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Proceedings of the 7th Eurasphalt & Eurobitume congress v1.0, 16th -18th June 2021
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Publication
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2020
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ISBN
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978-90-802884-6-1
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Volume/pages
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(2020)
, p. 1-10
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Full text (publisher's version - intranet only)
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