Physical properties of asphalt rubber after being mixed with reclaimed asphalt mixes

• Autor(a) principal: Pais, Jorge C.
• Data de Publicação: 2008
• Outros Autores: Pereira, Paulo A. A., Junior, J., Gardete, Dinis
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/1822/16677
• topic: Physical properties; Asphalt rubber; Asphalt mixes; Recycling

Recycling of road pavements became an effective technique after the European legislation defined the amount of reclaimed material that could be sent to landfills. This rehabilitation technique allows the re-use of old pavement material and favours the reduction of the amount of new materials used to produce new pavement layers. One of the most promising pavement rehabilitation techniques uses asphalt rubber mixtures, i.e. asphalt mixtures in which the binder is asphalt modified by crumb rubber from ground tires. The performance of asphalt rubber mixtures, evaluated in laboratory and in situ, has shown excellent results for pavement rehabilitation and it is based on the physical properties of the asphalt rubber which are transferred from the rubber to the net asphalt. The use of asphalt rubber in pavement recycling produces a binder which is the mix of the reclaimed mix binder and the new asphalt rubber added to the reclaimed asphalt mix. This recycled binder presents properties mainly based on the recycling ratio and on the binders used in recycling. This paper presents the results related to the evaluation of properties for recycled binders derived from the type of binder presented in the reclaimed asphalt mix and recycling ratio. The influence of the asphalt rubber in the recycled binder was also studied to predict the expected behaviour of the recycled mixes.