“…5 allows to compare the degree of leaching of the geopolymer pastes (MK_Na, MK_K, MI_Na and MI_K). In the present paper, the leaching coefficients were calculated according to [41,42] and considering the total volume of samples submerged in the sulfuric acid solution and thus, the initial molar concentrations of Si, Al, Ca, Fe, Na, K, Mg and Ti present in the solid fraction of the geopolymers (cf. Table 1) as well as the additional Si, K, and Na amount coming from the activators (cf.…”