Abstract
The amounts of the components in a microcapsule self-healing system significantly impact the basic performance and self-healing performance of concrete. In this paper, an orthogonal experimental design is used to investigate the healing performance of microcapsule self-healing concrete under different pre-damage loads. The strength recovery performance and sound speed recovery performance under extensive damage are analyzed. The optimum factor combination of the microcapsule self-healing concrete is obtained. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) are carried out on the concrete samples before and after healing to determine the healing mechanism. The results show that the healing effect of self-healing concrete decreases with an increase in the pre-damage load, and the sound speed recovery rate increases with an increase in the damage degree. The influence of the sodium silicate content on the compressive strength and compressive strength recovery rate of the self-healing concrete increases, followed by a decrease. The optimum combination of factors of the microcapsule self-healing system is 3% microcapsules, 30% sodium silicate, and 15% sodium fluosilicate. The results can be used for the design and preparation of self-healing concrete.
Highlights
Self-healing concrete is used to prevent concrete deterioration and improve durability [1,2,3]
Zhang et al [19] used the mercury intrusion and nitrogen adsorption methods combined with micro-computed tomography (μ-CT) to characterize the pore structure of the microencapsulated cement-based materials containing epoxy resin
The above studies demonstrated the effectiveness of the performance recovery of self-healing concrete with microcapsules and focused on the appropriate dosage of the microcapsules, laying a foundation for subsequent large-scale experimental applications
Summary
Self-healing concrete is used to prevent concrete deterioration and improve durability [1,2,3]. Kosarli et al [21] synthesized cement-based self-healing microcapsules with epoxy resin as the core material, analyzed the self-healing process of the microcapsules in the concrete using the capillary dynamics principle, and established a new self-healing evaluation method using the seepage structure parameters, pore structure parameters, and adsorption–desorption curve as indices. X-ray μ-CT was used to analyze the healing mechanism of two types of microcapsule self-healing systems Both systems provided a good crack healing performance in concrete. The reviewed studies combined different principles to explore the healing mechanism of microencapsulated self-healing concrete in different environments. A microcapsule system is used in cement-based composites, and an orthogonal test is used to analyze the healing performance for different pre-damage loads. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) are conducted on the concrete samples before and after healing to determine the healing mechanism of the microcapsule self-healing concrete
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