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(a) Self-healing products at Cross-section 1 in the middle of the crack (EXP 11, SEM BSE image 400×), (b) self-healing products at Cross-section 2 at the bottom of the crack (EXP 11, SEM BSE image 400×), (c) self-healing products at Cross-section 1 in the middle of the crack (EXP 3, SEM BSE image 500×), and (d) self-healing products at Cross-section 2 in the middle of the crack (EXP 3, SEM BSE image 1000×).
