Fig. 4

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Average results from the elaborated photos. (a) after 21 days, (b) after 28 days. Z1 and Z2 are the colonized zones by moulds of the specimens, in particular zone 1: completely colonized; zone 2: boundary zone. HL: hydraulic lime, S: sand, A1: zeolite, A2 silica gel, A3 activated carbon.
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