Open Access

ARTICLE

Effect of Encapsulation Combined with Microwave Heating on Self-Healing Performance of Asphalt Mixture

by Benan Shu^1,*, Lixian Guo¹, Bing Qiu¹, Tengyu Yang¹, Tao Sun¹, Wenjun Qiu¹, Min Zhou¹, Putao Song², Yuanyuan Li³, Diego Maria Barbieri⁴, Shaopeng Wu^5,*

1 Foshan Transportation Science and Technology Co., Ltd., Foshan, 528000, China
2 China Academy of Building Research, Beijing, 100000, China
3 School of Civil Engineering and Architecture, Wuhan Institute of Technology, Wuhan, 430070, China
4 Department of Civil and Environmental Engineering, Norwegian University of Science and Technology, Trondheim, 7491, Norway
5 State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, China

* Corresponding Authors: Benan Shu. Email: ; Shaopeng Wu. Email:

Journal of Renewable Materials 2021, 9(10), 1781-1794. https://doi.org/10.32604/jrm.2021.015659

Received 03 January 2021; Accepted 04 February 2021; Issue published 12 May 2021

Abstract

As an innovative maintenance technology of asphalt pavement, encapsulated rejuvenator used to improve its self-healing performance has been widely investigated by researchers in recent years. In this work, the selfhealing properties of asphalt mixture with and without encapsulations were comparatively studied considering these parameters: Healing time, healing cycles and microwave heating. Three-point bending strength recovery test and fatigue loading cycles recovery test were conducted for two kinds of encapsulations containing the healing agents present inside the asphalt mixture, namely compartmented Ca-alginate/SiO2 fiber and compartmented Ca-alginate/graphene oxide fiber. The results showed that the optimum healing time was three days. After the 30 s of microwave heating, the recovery of fatigue loading cycles of asphalt mixture with compartmented Ca-alginate/graphene oxide fiber was four times larger than that of control asphalt mixture. Compared with the single effect related to the encapsulated healing agent or temperature, the synergistic effect of temperature and encapsulation could further significantly improve the self-healing properties of asphalt mixture. The compartmented Ca-alginate/graphene oxide fiber not only could soften asphalt through the encapsulated healing agent to improve self-healing properties of asphalt, but also could repeatedly and quickly heal cracks thanks to microwave action. The synthesis of the fiber breaks the current boundary between the two technologies (capsules healing method and induction healing method) and opens up a new horizon for the asphalt self-healing technology.

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