Title
The role of rejuvenators in embedded damage healing for asphalt pavement
Author
Xu, S.
Liu, X.
Tabaković, A.
Lin, P.
Zhang, Y.
Nahar, S.
Lommerts, B.J.
Schlangen, E.
Publication year
2021
Abstract
Rejuvenator encapsulation technique showed great potential for extrinsic asphalt pavement damage healing. Once the capsules are embedded within asphalt pavement, the healing is activated on-demand via progressing microcrack. When the microcrack encounters the capsule, the fracture energy at the tip opens the capsule and releases the rejuvenator. Then the released rejuvenator wets the crack surfaces, diffuses into and softens the aged bitumen, allowing two broken edges to come in the contact, preventing further asphalt pavement deterioration. The quality and speed of the damage repair process strongly depend on the quality of rejuvenator, thus it is important to choose a proper rejuvenator with good abilities to restore the lost properties of bitumen from ageing and show a sustainable performance after healing. To this aim, three different rejuvenators were studied and ranked based on the performance of their rejuvenated bitumen, including physical properties, rheological properties, chemical properties and the performance after re-ageing. Furthermore, these rejuvenators were encapsulated in calcium alginate capsules and the tests on these capsules indicate the diameter, mechanical resistance and thermal stability of the capsules are influenced by the encapsulated rejuvenator. The findings will benefit the development of rejuvenator encapsulation technique and the optimization of the capsule healing system towards a better healing effect in asphalt pavement.
Subject
Self-healing asphalt
Rejuvenator
Re-ageing
Calcium alginate capsules
To reference this document use:
http://resolver.tudelft.nl/uuid:62bc7451-129d-4d7c-8754-32961b005d33
DOI
https://doi.org/10.1016/j.matdes.2021.109564
TNO identifier
957564
Publisher
Elsevier
Source
Materials and Design, 202 (202)
Document type
article