Rheological aspects of the rejuvenation of aged bitumen |
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Authors: | Ramón Romera Anton Santamaría Juan José Peña Maria Eugenia Muñoz Marisol Barral Esteban García Victorio Jañez |
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Institution: | (1) Polymer Science and Technology Department and Polymer Institute POLYMAT, Faculty of Chemistry, University of the Basque Country UPV/EHU, P.O. Box 1072, E-20080 San Sebastián, Spain;(2) Asfaltos Naturales de Campezo, S. A. Heraclio Fournier 4B-1°, E-01006 Vitoria, Spain;(3) Guipasa, S. A. Plaza de los Amézqueta, 10 Bajo, E-20010 San Sebastián, Spain |
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Abstract: | Rheological techniques are used to investigate the rejuvenation of aged bitumen. The thermal transition associated with the collapse of the compact structure constituted by asphaltene is determined by Dynamic Mechanical Thermal Analysis. For aged bitumen, this transition shifts to a higher temperature but when rejuvenating agents are added, the transition returns to its original value. The “rutting factor,” G*/sin δ allows to define the maximum temperature the binder can reach without permanent deformation. The employed rejuvenating agents are suitable because permanent deformation is postponed. Viscosity results reveal that aged bitumen needs a high mixing temperature (>200°C) to behave like a fluid material able to wet, adhere, and envelop aggregates. The addition of rejuvenating agents considerably reduces mixing and compaction temperatures. The mixture of 80% aged bitumen—20% recycled motor oil, obtained exclusively from waste materials is an apt binder that can compete satisfactorily with new 60/70 bitumen.Paper presented at the AERC2005. This paper will be part of a special issue of AERC2005. |
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Keywords: | Asphalt pavement RAP Asphalt recycling Aged bitumen Rejuvenating agents |
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