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Crack sealing phenomenon of samples. (a) Changes in crack width of Mix 2 on days 35, 42, and 56; (b) changes in crack width of Mix 3 on days 35, 42, and 56; (c) changes in crack width of Mix 4 on days 35, 42, and 56; (d) changes in crack width of Mix 5 on days 35, 42, and 56; (e) changes in crack width of Mix 6 on days 35, 42, and 56; (f) changes in cracks width of Mix 7 on days 35, 42, and 56.
