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Roads, due to use and time, become aged and as a result, they require maintenance. This paper presents a promising technology to compensate ageing. The method uses porous aggregates as capsules containing rejuvenator. The rejuvenator will be released during the asphalt pavement's service life, reversing the impact of ageing on asphalt performance, properties and, thus, extending pavement's durability. This paper describes the properties of two porous aggregates, the encapsulation method and the properties of the capsules. The capsules were incorporated into an asphalt mix and their fundamental properties analysed. Finally, the recovery potential of the aged binder was evaluated using ageing tests. The results demonstrate the effectiveness of the technology, a change in binder properties was observed over time, but to a lesser extent for the bitumen when capsules were included than for the reference. The solution also highlights the benefits of using encapsulated rejuvenator over the use of rejuvenator directly added to the mix.

international journal of pavement engineering

Synthesis, characterisation and mechanical impact of novel capsules using porous aggregates containing asphalt rejuvenator as an effective way to restore aged binder properties