Table 1 – Mortar proportions for producing the bottom layer of all mortar formulations

Details on the materials used, the mortar formulations and the notation used throughout this study. <br> The labelling of the samples is as follows: <br> SI_R - represents plain mortar (samples in Set I) SI_R+GM_I_ACG-Ø - represents plain mortar with growth media I (calcium nitrate and yeast extract) and aerated concrete granules SI_R+GM_I_ACG-S - represents plain mortar with growth media I (calcium nitrate and yeast extract) and aerated concrete granules with spores SII_R - represents plain mortar (samples in Set II) SII_R+C_ ACG-Ø - represents plain mortar with calcium nitrate and aerated concrete granules SII_R+YA_ ACG-Ø - represents plain mortar with sodium acetate and aerated concrete granules SII_R+GM_II_ACG-Ø - represents plain mortar with with growth media II (calcium nitrate and sodium acetate) and aerated concrete granules SII_R+GM_II_ACG-S - represents plain mortar with with growth media II (calcium nitrate and sodium acetate) and aerated concrete granules with spores