Innovative ZIF-8 modified ER@EC microcapsules: Enhancing slow-release and longevity for superior self-healing in cementitious materials

IF 10.8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement & concrete composites Pub Date : 2025-02-04 DOI:10.1016/j.cemconcomp.2025.105966

Shiyu Zhang , Zijian Song , Haoliang Zhang , Zilang Huang , Hui Rong , Linhua Jiang , Yunsheng Zhang

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Abstract

Using microcapsules (MCs) for self-healing is one of the most cutting-edge strategies for repairing concrete cracks and improving the durability of reinforced concrete (RC) structures. MCs with ethyl cellulose (EC) as the shell material possess non-toxicity, high stability, and satisfactory encapsulation capacity. However, EC-based MCs suffer from the premature release of core materials due to their porous nature. This study synthesized the zeolitic imidazolate framework-8 (ZIF-8) and embedded it into the EC shell to enable a long-acting healing function of epoxy resin (ER) @ EC MCs. The morphology, thermal stability, chemical structure, release rates, and particle size of the ER@EC/ZIF-8 MCs were evaluated. The first and secondary self-healing performances of mortars with different MC dosages were determined. The results demonstrated the successful embedding of ZIF-8 into the MCs, with a 20 % dosage of ZIF-8 modification achieving the most sustained release. Furthermore, ER@EC/ZIF-8 MCs effectively reduced pores larger than 77.45 nm and decreased the overall porosity by 3.13 %. ZIF-8 modification enhanced strength healing, particularly the long-acting aspect, with the secondary healing rate peaking at 31.48 % at a 3 % dosage of modified MCs under dual 30 % f_c0 pre-damage. Meanwhile, the highest first healing rate (22.02 %) was also observed at a dosage of 3 % modified MCs under 30 % f_c0 pre-damage. Generally, the modified MCs showed a superior healing effect than the unmodified MCs. As a newly developed self-healing MC, the ER@EC/ZIF-8 MCs are expected to confer multifunctional properties to RC structures.

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来源期刊

Cement & concrete composites 工程技术-材料科学：复合

CiteScore

18.70

自引率

11.40%

发文量

459

审稿时长

65 days

期刊介绍： Cement & concrete composites focuses on advancements in cement-concrete composite technology and the production, use, and performance of cement-based construction materials. It covers a wide range of materials, including fiber-reinforced composites, polymer composites, ferrocement, and those incorporating special aggregates or waste materials. Major themes include microstructure, material properties, testing, durability, mechanics, modeling, design, fabrication, and practical applications. The journal welcomes papers on structural behavior, field studies, repair and maintenance, serviceability, and sustainability. It aims to enhance understanding, provide a platform for unconventional materials, promote low-cost energy-saving materials, and bridge the gap between materials science, engineering, and construction. Special issues on emerging topics are also published to encourage collaboration between materials scientists, engineers, designers, and fabricators.