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A platform for research: civil engineering, architecture and urbanism
Relationship between thermoreversible and irreversible aging in rejuvenated asphalt binder
Highlights Thermoreversible aging degree increases with an increase in irreversible aging. RTFO/PAV aging prior to EBBR test is sufficient to differentiate rejuvenated binders. RTFO aging behavior of rejuvenated binder is different from that of straight binder. Phase structures of the rejuvenated binders remain compatible during irreversible aging.
Abstract Rejuvenators are now widely used to restore performance of aged asphalt. A critical factor that controls performance of pavements in service is age hardening of the binder. Hence, both reversible and irreversible processes need to be accounted for in order to ensure durable designs. Thermoreversible processes are affected by irreversible aging, but how the two interact remains largely unexplored for rejuvenated binders. A straight Cold Lake PG 58-28 binder was blended with castor oil residue (COR), soybean oil residue (SOR) and petroleum-based aromatic oil (ARO) rejuvenators. Standard Extended Bending Beam Rheometer (EBBR, AASHTO TP 122) tests were conducted to assess thermoreversible aging. Non-isothermal crystallization kinetics were investigated using Modulated Differential Scanning Calorimetry (MDSC) and Thermogravimetric Analysis (TGA). Standard Rolling Thin-Film Oven (RTFO) followed by 20 h of Pressure Aging Vessel (PAV) conditioning proved sufficient to differentiate thermoreversible aging tendencies. However, EBBR grade losses increased significantly upon extended aging. Rejuvenated compositions fared worse in comparison to straight Cold Lake binder. Three-day grade losses for the PG 58-28 ranged from 1.8 °C (unaged) to 9 °C (100 h PAV). In contrast, the ARO blend lost 0.8 °C (unaged) increasing to a significant 15 °C (100 h PAV).
Relationship between thermoreversible and irreversible aging in rejuvenated asphalt binder
Highlights Thermoreversible aging degree increases with an increase in irreversible aging. RTFO/PAV aging prior to EBBR test is sufficient to differentiate rejuvenated binders. RTFO aging behavior of rejuvenated binder is different from that of straight binder. Phase structures of the rejuvenated binders remain compatible during irreversible aging.
Abstract Rejuvenators are now widely used to restore performance of aged asphalt. A critical factor that controls performance of pavements in service is age hardening of the binder. Hence, both reversible and irreversible processes need to be accounted for in order to ensure durable designs. Thermoreversible processes are affected by irreversible aging, but how the two interact remains largely unexplored for rejuvenated binders. A straight Cold Lake PG 58-28 binder was blended with castor oil residue (COR), soybean oil residue (SOR) and petroleum-based aromatic oil (ARO) rejuvenators. Standard Extended Bending Beam Rheometer (EBBR, AASHTO TP 122) tests were conducted to assess thermoreversible aging. Non-isothermal crystallization kinetics were investigated using Modulated Differential Scanning Calorimetry (MDSC) and Thermogravimetric Analysis (TGA). Standard Rolling Thin-Film Oven (RTFO) followed by 20 h of Pressure Aging Vessel (PAV) conditioning proved sufficient to differentiate thermoreversible aging tendencies. However, EBBR grade losses increased significantly upon extended aging. Rejuvenated compositions fared worse in comparison to straight Cold Lake binder. Three-day grade losses for the PG 58-28 ranged from 1.8 °C (unaged) to 9 °C (100 h PAV). In contrast, the ARO blend lost 0.8 °C (unaged) increasing to a significant 15 °C (100 h PAV).
Relationship between thermoreversible and irreversible aging in rejuvenated asphalt binder
Ma, Jianmin (author) / Deng, Yue (author) / Sun, Daquan (author) / Hesp, Simon A.M. (author)
2022-10-14
Article (Journal)
Electronic Resource
English
Asphalt , Thermoreversible aging , Oxidative aging , Rejuvenation , EBBR , MDSC , TGA
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