## 3 Results
### Thermal Conductivity  
The results of determining the thermal conductivity of samples of non-autoclaved aerated concrete are presented in Table 12.  
The dependences of the change in the thermal conductivity coefficients of compositions of type A, B, and AB are shown in Figure 8.  
Figure 8 shows that the best values of thermal conductivity coefficients are observed in compositions of type A. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Additive Type**} & \multicolumn{3}{c}{**Change in \% (A) of the Coefficient of Constructive Quality at the Following**} \\  & \multicolumn{3}{c}{**Dosages of Additives (\%) Introduced Instead of Part of the Binder**} \\ \cline{2-6}  & **0** & **4** & **8** & **12** & **16** & **20** \\ \hline MS & 0 & +12 & +27 & +34 & +46 & +11 \\ GBFS & 0 & \(-5\) & \(-7\) & \(-19\) & \(-30\) & \(-39\) \\ MSGBFS & 0 & +2 & \(-6\) & \(-17\) & \(-20\) & \(-25\) \\ \hline \hline \end{tabular}
\end{table} 
Table 11: Change in the coefficients of structural quality of non-autoclaved aerated concrete depending on the type of additive and its dosage. \begin{table}
\begin{tabular}{c c} \hline \hline \multicolumn{1}{c}{**Composition Number**} & \multicolumn{2}{c}{**Dry Thermal Conductivity \(\lambda\), W/(m\(\cdot\)C)**} \\ \hline C & 0.365 \\
1A & 0.359 \\
2A & 0.341 \\
3A & 0.332 \\
4A & 0.330 \\
5A & 0.340 \\
1B & 0.367 \\
2B & 0.369 \\
3B & 0.374 \\
4B & 0.378 \\
5B & 0.382 \\
1 AB & 0.368 \\
2 AB & 0.371 \\
3 AB & 0.372 \\
4 AB & 0.380 \\
5 AB & 0.383 \\ \hline \hline \end{tabular}
\end{table} 
Table 12: Results of determining the thermal conductivity of samples of non-autoclaved aerated concrete. Regression equations for thermal conductivity coefficients are given in Equations (9)-(11). The coefficient of determination is also quite high from 0.96 to 0.99. \[\lambda_{MS} =0.365\ -\ 0.00118\ \times x-\ 0.000334\times x^{2}+1.65\times 10^{-5} \times x^{3},\ \ \ \ \ R^{2}=0.987 \tag{9}\] \[\lambda_{GBFS} =0.365+0.000477\times x+2.00\times 10^{-5}\times x^{2},\ \ \ \ \ \ R^{2}=0.99\] (10) \[\lambda_{MS+GBFS} =0.365+0.000460\times x+2.23\times 10^{-5}\times x^{2},\ \ \ \ \ \ R^{2}=0.96 \tag{11}\]  
Replacing cement with an MS additive in an amount of 16% provides the maximum reduction in thermal conductivity to 10%. Thus, in Table 13, the values of changes in the thermal conductivity coefficients of the experimental compositions are given in percentage terms depending on the type and dosage of the additive. Table 13 shows that the most significant influence on the change in the thermal conductivity coefficient is exerted by the addition of silica fume at its content in the range from 8% to 20%. The addition of ground blast-furnace slag and the MS:GBFS complex \begin{table}
\begin{tabular}{c c c c c c c} \hline \multirow{2}{*}{**Additive Type**} & \multicolumn{5}{c}{**Change in \% (\(\lambda\)) of the Coefficient of Thermal Conductivity at the Following Dosages of Additives (\%) Introduced Instead of Part of the Binder**} \\ \cline{2-7}  & **0** & **4** & **8** & **12** & **16** & **20** \\ \hline MS & 0 & \(-2\) & \(-7\) & \(-9\) & \(-10\) & \(-7\) \\ GBFS & 0 & \(+1\) & \(+1\) & \(+2\) & \(+4\) & \(+5\) \\ MS:GBFS & 0 & \(+1\) & \(+2\) & \(+2\) & \(+4\) & \(+5\) \\ \hline \end{tabular}
\end{table} 
Table 13: Change in the thermal conductivity coefficients of non-autoclaved aerated concrete depending on the type of additive and its dosage. Figure 8: Change in the thermal conductivity of non-autoclaved aerated concrete depending on the percentage of binder replacement by various types of additives. As a rule, the microstructure of aerated concrete directly depends on the type and number of phases, the rate of hydration, the type of reaction products formed, and their distribution in the aerated concrete matrix [24].