Table 5.
Physical and mechanical properties of the geopolymer sample (MK) and geopolymeric mortars obtained with porcelain stoneware waste (PS-MK), raw pressed waste (RP-MK), calcined raw pressed waste (RPdry-MK), and gypsum (Gy-MK) as filler, and of the geopolymeric mortar with the mixed filler whose composition is reported in Table 2 (MIX-MK). The calcined raw pressed clay (RPdry) was obtained by annealing as obtained raw pressed clay (RP) in an oven at 750 °C for 5 h.
| Sample Properties | MK | PS-MK | RP-MK | RPdry-MK | Gy-MK | MIX-MK |
|---|---|---|---|---|---|---|
| Density (kg/m3) | 1370 | 1773 ± 95 | 1718 ± 80 | 1687 ± 90 | 1335 ± 99 | 1627 ± 77 |
| Water absorption (%) | 18 ± 1 | 16 ± 1 | 18 ± 1 | 19 ± 1 | >25 | >25 |
| Compressive strength (MPa) | 25 ± 2 | 30 ± 1 | 25 ± 3 | 41 ± 3 | 4.0 ± 0.5 | 38 ± 2 |