## 3 Results
### Compressive and Flexural Strength Test Results  
The results of the durability test showed that the highest compressive strengths were those of the WM 4 series of samples based on the CEM II cement binder, in which the amount of cement predominated relative to the amount of wool. Their average compressive strength was 17.78 MPa. The series of samples with the lowest compressive strength was the series also based on cement binder (CEM II); in this case, however, the highest intake of wool was accompanied by the lowest intake of cement. Regarding the flexural strength, the samples based on geopolymer mortar performed best with a high proportion of mineral wool. The series of samples with the lowest compressive strengths was the WM6 series, \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**PL** & **Unit** & **WM1** & **WM2** & **WM3** & **WM4** & **WM5** & **WM6** \\ \hline Arsenic, As & mg/kg & 0.42 & 0.39 & 0.42 & \textless{}0.01 & \textless{}0.01 & \textless{}0.01 \\ Barium, Ba & mg/kg & 0.040 & 0.020 & \textless{}0.01 & 1.80 & 2.36 & 2.52 \\ Cadmium, Cd & mg/kg & \textless{}0.01 & \textless{}0.01 & \textless{}0.01 & \textless{}0.01 & \textless{}0.01 & \textless{}0.01 \\ Chromium, Cr & mg/kg & 0.24 & 0.19 & 0.13 & 3.23 & 2.04 & 1.33 \\ Copper, Cu & mg/kg & 2.54 & 1.59 & 0.99 & 0.14 & 0.15 & 0.17 \\ Mercury, Hg & mg/kg & 0.003 & 0.003 & 0.009 & 0.0004 & 0.0004 & 0.0002 \\ Molybdenum, Mo & mg/kg & \textless{}0.20 & 0.22 & 0.3 & 0.73 & 0.41 & 0.37 \\ Nickel, Ni & mg/kg & 0.49 & 0.58 & 0.46 & \textless{}0.01 & \textless{}0.01 & \textless{}0.01 \\ Lead, Pb & mg/kg & 4.08 & 2.03 & 0.92 & \textless{}0.01 & \textless{}0.01 & \textless{}0.01 \\ Antimony, Sb & mg/kg & \textless{}0.20 & \textless{}0.20 & 0.21 & 1.03 & 0.91 & 0.94 \\ Selenium, Se & mg/kg & 0.24 & \textless{}0.20 & \textless{}0.20 & \textless{}0.20 & \textless{}0.20 & \textless{}0.20 \\ Zinc, Zn & mg/kg & 0.13 & 0.050 & 0.040 & \textless{}0.01 & \textless{}0.01 & 0.01 \\ Chlorides, Cl\({}^{-}\) & mg/kg & 17.0 & 15 & 13.8 & 31 & 31 & 46.6 \\ Fluorides, F\({}^{-}\) & mg/kg & 28.4 & 20.6 & 13.1 & 2.50 & 2.50 & 3.40 \\ Sulphates, SO\({}_{4}\)\({}^{2-}\) & mg/kg & 117 & 45.3 & 175 & 1870 & 1600 & 1550 \\ Dissolved organic carbon, DOC & mg/kg & 633 & 965 & 1000 & 37.4 & 38.5 & 44.8 \\ Total dissolved solids (TDS) & mg/kg & 72,760 & 70,000 & 67,540 & 5400 & 4210 & 4040 \\ Sodium, Na & mg/kg & 29,710 & 27,330 & 28,940 & 826 & 346 & 249 \\ pH & - & 12.7 & 12.7 & 11.2 & 11.1 & 11.1 & 11.1 \\ (T) & (\({}^{\circ}\)C) & (22.3) & (22.4) & (22.5) & (23) & (22.9) & (22.5) \\ Formaldehyde & mg/kg & 5.56 & 8.30 & 12.6 & 5.18 & 7.22 & 8.41 \\ Phenolic index & mg/kg & 0.870 & 1.35 & 0.620 & 0.210 & 0.350 & 0.470 \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Leachability of selected contaminants from geopolymer and cement mortar, expressed as mg/kg dry weight compared with maximum acceptable waste disposal rates. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline  & **Unit** & **WM1** & **WM2** & **WM3** & **WM4** & **WM5** & **WM6** & **Mineral Wool** \\ \hline pH & \({}^{\circ}\)C & 12.7 & 12.7 & 12.7 & 11.2 & 11.1 & 11.1 & 8.9 \\ (Temperature) & \({}^{\circ}\)C & (22.3) & (22.4) & (22.5) & (23) & (22.9) & (22.5) & (21.9) \\ Formaldehyde & mg/kg & 5.56 & 8.30 & 12.60 & 5.18 & 7.22 & 8.41 & 578 \\ Phenolic index & mg/kg & 8.70 & 1.35 & 0.62 & 0.21 & 0.35 & 0.47 & 7.80 \\ \hline \hline \end{tabular}
\end{table} 
Table 8: Leachability of phenol and formaldehyde from geopolymer, cement mortar, and mineral wool, expressed as mg/kg dry weight compared with maximum acceptable waste disposal rates. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Sample No.** & **Wool Quantity (\%)** & **Formaldehyde (mg/kg)** \\ \hline WM1 & 7.5 & 5.56 \\ WM2 & 12.5 & 8.30 \\ WM3 & 17.5 & 12.60 \\ WM4 & 7.5 & 5.18 \\ WM5 & 12.5 & 7.22 \\ WM6 & 17.5 & 8.41 \\ Mineral wool & 100 & 578 \\ \hline \hline \end{tabular}
\end{table} 
Table 9: Correlation between wool quantity and formaldehyde leachate expressed as mg/kg dry weight.