Laboratory evaluation of cold recycled mixture with foamed waste oil-activated rubberized asphalt.

To realize the resourceful utilization of roadway waste for recycling and low-carbon construction, two environmental-friendly pavement technologies pertaining to cold recycled foamed asphalt mixture and crumb rubber asphalt (CRA) were combined to prepare foamed rubberized asphalt cold recycled mixture (FRA-CRM). The results indicate that pre-swelled activated crumb rubber (CR) by waste oil with foaming agent can enhance the foaming effect of CRA and reduce the manufacturing temperature by 15 °C, and it presents better fatigue resistance and low-temperature performance. Moreover, the moisture susceptibility, high-temperature rutting resistance, and low-temperature cracking resistance of FRA-CRM have been substantially ameliorated in comparison with traditional foamed matrix asphalt cold recycled mixture. Life cycle assessment analysis shows that compared with conventional hot mix CRA mixture, the production demand of FRA-CRM per 1 t contributes to approximate 45.13 % reduction in greenhouse gas emissions and 51.38 % of energy saving. [ABSTRACT FROM AUTHOR]