Calcium alginate capsules encapsulating rejuvenator as healing system for asphalt mastic

Journal Article (2018)
Author(s)

S. Xu (TU Delft - Materials and Environment)

Amir Tabakovic (Dublin Institute of Technology, University College Dublin)

Erik Schlangen (TU Delft - Materials and Environment)

X Liu (TU Delft - Pavement Engineering)

Research Group
Materials and Environment
Copyright
© 2018 S. Xu, A. Tabakovic, E. Schlangen, X. Liu
DOI related publication
https://doi.org/10.1016/j.conbuildmat.2018.01.046
More Info
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Publication Year
2018
Language
English
Copyright
© 2018 S. Xu, A. Tabakovic, E. Schlangen, X. Liu
Research Group
Materials and Environment
Bibliographical Note
Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. @en
Volume number
169
Pages (from-to)
379-387
Reuse Rights

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Abstract

Researchers have demonstrated that the rejuvenator encapsulation method is a promising autonomic self-healing approach for asphalt pavements, where by the self-healing system improves the healing capacity of an asphalt pavement mix. However, potentially high environmental risk via leaching of hazardous chemicals such as melamine formaldehyde renders the technology unsuitable for widespread use in road design. This paper explores the potential for the use of more environmentally friendly and economically viable rejuvenator encapsulation method, where the calcium alginate is used as rejuvenator encapsulation material. The capsule morphology and microstructure were studied using the Microscopy and X-ray tomography. Capsules thermal resistance and mechanical strength were investigated using the Thermogravimetric analysis (TGA) and micro-compressive tests. The results demonstrated that the capsules have sufficient thermal and mechanical strength to survive the asphalt production process. The healing efficiency of the system was evaluated by embedment of calcium-alginate capsules encapsulating rejuvenator in an asphalt mastic beams and subjected to monotonic three-point bend (3PB) loading and healing programme. The results illustrated that the calcium-alginate capsules encapsulating rejuvenator can significantly improve healing performance of the asphalt mastic mix.

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