The aim of this study is analyzing the self-healing effect of a crystalline admixture in four types of 11 environmental exposure comparing with a reference concrete. Healing was studied by means of permeability tests on 12 cracked specimens and physical closing of the crack was observed by optic microscope and quantified through crack 13 geometrical parameters. The studied crack openings were under 300 μm and the time set for healing was 42 days. The 14 results show a different healing behavior depending on the exposure and the presence of the crystalline admixture, 15 demonstrating that the presence of water is necessary for the healing reactions. 16

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