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  Scopus ID: 21100926589

Self-healing Microencapsulation Technology for Asphalt Pavements: A Review

Yousra Zghoundi, Meryem Boutgoulla, Nacer Akkouri, Yassine Taha, Rachid Hakkou, Khalid El-Azdi, Mohamed Kebir, Yahya Agzenai Ben Salem and Zineb Edfouf

Abstract

Self-healing bituminous materials are at the cutting edge of asphalt pavements technologies. To enable self-healing capability, various techniques “based on extrinsic self-healing” have been developed: externally triggered heating using induction heating or microwave radiation, and, more recently, the use of embedded microcapsules. These technologies typically involve adding rejuvenators, special materials, or additives, to the asphalt mix that can react and repair microcracks at the beginning of the cracking process. One particularly promising approach is microencapsulation healing technology, which involves encapsulating rejuvenating agents within microcapsules. This revolutionary technology holds immense potential for the autonomous healing of aged bituminous materials. When microcapsules are incorporated into asphalt pavements, they can achieve impressive recovery rates, with healing efficiencies ranging from 30% to 90%, bringing the pavement closer to its initial state. There are many techniques used to encapsulate materials which can be classified into three categories depending on the capsule manufacturing. These categories include physico-mechanical methods, which rely on mechanical actions or physical processes; chemical methods, resulting from chemical interactions between the materials; and physico-chemical methods, which involve the formation of the capsule wall using natural or synthetic preformed polymers. The purpose of this paper is to provide an overview of microencapsulation technologies to promote asphalt self-healing from a sustainable perspective.

Published on: September 28, 2023
doi: 10.17756/nwj.2023-s2-058
Citation: Zghoundi Y, Boutgoulla M, Akkouri N, Taha Y, Hakkou R, et al. 2023. Self-healing Microencapsulation Technology for Asphalt Pavements: A Review. NanoWorld J 9(S2): S341-S349.

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