Effect of the recycling process and binder type on bituminous mixtures with 100% reclaimed asphalt pavement

There is a great interest in increasing the amount of recycled material used in asphalt mixes because of the beneficial impact on the environment. This is leading to the development of different recycling procedures, from cold in-situ to hot in-plant recycling. The objective of the study presented in this paper is to evaluate cracking resistance of recycled mixes manufactured by three types of processes, i.e., cold with emulsion, hot with high penetration bitumens and hot with emulsion (half-warm mixture), using 100% of reclaimed asphalt pavement (RAP) at different temperatures. Differences in their workability and ease of use are also analysed by gyratory compaction.Peer ReviewedPostprint (author's final draft

Reciclado en frío con emulsión: compactación en laboratorio representativa de la obtenida in situ

El reciclado en frío con emulsión mediante el fresado de antiguos pavimentos asfálticos envejecidos es una técnica de rehabilitación que presenta innumerables ventajas; mereciendo destacarse que es amigable con el medio ambiente a una relación costo-beneficio razonable. Sin embargo, esta técnica no ha tenido un desarrollo masivo debido a una serie de inconvenientes que dificultan su implementación, porque, si bien existe una multiplicidad de metodologías de diseño, en la mayoría de los casos resulta difícil representar en laboratorio unas densidades de la mezcla reciclada similares a las que se consiguen tras su puesta en obra. Con el objeto de definir un procedimiento de compactación que reproduzca el grado de densificación usualmente alcanzado por la mezcla extendida y compactada en la obra, se ha realizado una evaluación de los resultados obtenidos por dos vías: compactación estática con 6 toneladas y compactador giratorio Superpave de la metodología SHRP. En el presente trabajo se detallan los resultados obtenidos tras los estudios de laboratorio y las correspondientes correlaciones encontradas con los resultados obtenidos en obra

Reciclado en frío con emulsión: compactación en laboratorio representativa de la obtenida in situ

El reciclado en frío con emulsión mediante el fresado de antiguos pavimentos asfálticos envejecidos es una técnica de rehabilitación que presenta innumerables ventajas; mereciendo destacarse que es amigable con el medio ambiente a una relación costo-beneficio razonable. Sin embargo, esta técnica no ha tenido un desarrollo masivo debido a una serie de inconvenientes que dificultan su implementación, porque, si bien existe una multiplicidad de metodologías de diseño, en la mayoría de los casos resulta difícil representar en laboratorio unas densidades de la mezcla reciclada similares a las que se consiguen tras su puesta en obra. Con el objeto de definir un procedimiento de compactación que reproduzca el grado de densificación usualmente alcanzado por la mezcla extendida y compactada en la obra, se ha realizado una evaluación de los resultados obtenidos por dos vías: compactación estática con 6 toneladas y compactador giratorio Superpave de la metodología SHRP. En el presente trabajo se detallan los resultados obtenidos tras los estudios de laboratorio y las correspondientes correlaciones encontradas con los resultados obtenidos en obra.Postprint (published version

Effect of hydrated lime and cement on moisture damage of recycled mixtures with foamed bitumen and emulsion

Cold recycling with foamed bitumen can be used as a sustainable and cost-effective rehabilitation technique. This paper focuses on the evaluation of the resistance to the water action in mixtures with reclaimed asphalt pavement (RAP) and foamed bitumen by means of indirect tensile test, comparing the effect of two active fillers: cement and hydrated lime. Additionally, mixtures recycled with RAP and asphalt emulsions were also tested in order to compare the response of both technologies. Results confirm the beneficial effect of lime and cement addition to increase the strength of mixtures subjected to wet condition. However, there is no clear trend observed in the results of the mixtures with foamed bitumen and additives with the aim of defining the optimum cement and lime content.Postprint (author's final draft

Effect of the recycling process and binder type on bituminous mixtures with 100% reclaimed asphalt pavement

There is a great interest in increasing the amount of recycled material used in asphalt mixes because of the beneficial impact on the environment. This is leading to the development of different recycling procedures, from cold in-situ to hot in-plant recycling. The objective of the study presented in this paper is to evaluate cracking resistance of recycled mixes manufactured by three types of processes, i.e., cold with emulsion, hot with high penetration bitumens and hot with emulsion (half-warm mixture), using 100% of reclaimed asphalt pavement (RAP) at different temperatures. Differences in their workability and ease of use are also analysed by gyratory compaction.Peer Reviewe

Effect of hydrated lime and cement on moisture damage of recycled mixtures with foamed bitumen and emulsion

Cold recycling with foamed bitumen can be used as a sustainable and cost-effective rehabilitation technique. This paper focuses on the evaluation of the resistance to the water action in mixtures with reclaimed asphalt pavement (RAP) and foamed bitumen by means of indirect tensile test, comparing the effect of two active fillers: cement and hydrated lime. Additionally, mixtures recycled with RAP and asphalt emulsions were also tested in order to compare the response of both technologies. Results confirm the beneficial effect of lime and cement addition to increase the strength of mixtures subjected to wet condition. However, there is no clear trend observed in the results of the mixtures with foamed bitumen and additives with the aim of defining the optimum cement and lime content