Self-healing concrete is one of the effective methods for solving concrete deterioration and improving durability. However, the effects of crack width and healing time on healing performance are still part of an open problem. In this paper, the effects of crack width and healing time on healing performance of microcapsule-based self-healing concrete are studied. First, the chloride ion permeability tests were conducted to evaluate the effects of crack width and healing time on chloride ion permeability of the self-healing concrete. Then, three-point bending tests were conducted to study the effects of crack width and healing time on flexural behavior of the self-healing concrete system. The results show that the chloride ion penetration healing rate decreases significantly with the increase of crack width. The increasing trend of the healing rate of the specimens healing for 7 days and 14 days is faster, while the increasing trend of the healing rate of the specimens healed for 56 days is slower. When the crack width is less than 0.05 mm, the self-healing can restore or even exceed the initial performance of concrete specimens. When the crack width exceeds 0.15 mm, the damage degree has exceeded the healing capacity of the healing system, and it is difficult to restore the initial performance of concrete. This work provides a valuable reference for the design and preparation of self-healing concrete structures.
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