# Humidity Conditions of Aerated Concrete Walls Depending on the Type of Finishing Coating
## 3 Results
Thus, for the conditions in the city of Voronezh, the use of heat-insulating lime plaster can significantly improve the humidity regime in walls made of aerated concrete blocks of grades D350, D400, and D500. Similarly, the same comparisons were made for the cities of Rostov-on-Don, Novosibirsk, and Vorkuta. This calculation was performed for an external enclosing structure located in the city of Voronezh, with aerated concrete at grade D400. Cement-sand plaster with a density of \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**City**} & \multirow{2}{*}{**Finishing Coating Density \(\rho\), kg/m\({}^{3}\)**} & \multicolumn{5}{c}{**Aerated Concrete Grade**} \\ \cline{3-6}  & & **D350** & **D400** & **D500** & **D600** \\ \hline \multirow{3}{*}{Rostov-on-Don} & 650 & \(-\)7.9 & \(-\)8.7 & \(-\)10.4 & \(-\)11.3 \\  & 1100 & \(-\)2.5 & \(-\)3.4 & \(-\)6.6 & \(-\)8.4 \\  & 1800 & \(-\)0.9 & \(-\)1.7 & \(-\)4.7 & \(-\)7.1 \\  & 650 & \(-\)8.7 & \(-\)9.3 & \(-\)10.6 & \(-\)11.5 \\  & 1100 & \(-\)4.0 & \(-\)4.8 & \(-\)7.5 & \(-\)8.9 \\  & 1800 & \(-\)2.4 & \(-\)3.1 & \(-\)6.0 & \(-\)7.8 \\  & 650 & \(-\)9.9 & \(-\)10.5 & \(-\)11.4 & \(-\)12.0 \\ Novosibirsk & 1100 & \(-\)6.6 & \(-\)7.6 & \(-\)9.2 & \(-\)10.1 \\  & 1800 & \(-\)5.2 & \(-\)6.5 & \(-\)8.4 & \(-\)9.4 \\  & 650 & \(-\)9.8 & \(-\)10.2 & \(-\)11 & \(-\)11.5 \\  & 1100 & \(-\)7.1 & \(-\)7.9 & \(-\)9.2 & \(-\)10 \\  & 1800 & \(-\)6.0 & \(-\)8.9 & \(-\)8.4 & \(-\)9.3 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Temperature at the beginning of the condensation \(t_{b.c. }\), ’C. Figure 3: Distribution of the water vapor pressure along the wall thickness. 1800 kg/m\({}^{3}\) was used as an exterior finish in the structure. To do this, we consistently use Formulas (6)-(8). The calculation results are presented in Table 5.  
Similarly, the calculation was carried out for the remaining 48 studied external enclosing structures. The research results for the cities of Rostov-on-Don and Voronezh are shown in Figure 5.  
Figure 4: Dependence of the temperature at the beginning of the condensation, \(t_{b,c}\), on the density of the aerated concrete in the city of Voronezh: (1) cement–sand plaster; (2) Knauf GRUNBAND; (3) the developed DBM. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**Name of the Month** & **January** & **February** & **March** & **April** & **October** & **November** & **December** \\ \hline Month number & I & II & III & IV & X & XI & XII \\ \hline Average temperature of the month \(t_{out}\), \({}^{\circ}\)C & \(-7.4\) & \(-7.0\) & \(-1.3\) & 8.4 & 6.6 & 0.0 & \(-4.8\) \\ \hline Diffusion rate during humidification \(G_{hyd}^{h}\) & 512 & 506 & 0.0 & 0.0 & 0.0 & 0.0 & 467 \\ mg/m\({}^{2}\)-h & 313 & 322 & 0.0 & 0.0 & 0.0 & 0.0 & 380 \\ \hline Amount of condensate falling out per hour & 199 & 184 & 0.0 & 0.0 & 0.0 & 0.0 & 87 \\ \(G_{c}^{h}\), mg/m\({}^{2}\) & 0.381 & 0.377 & 0.0 & 0.0 & 0.0 & 0.0 & 0.347 \\ \hline Amount of moisture (drying) per month & 0.233 & 0.239 & 0.0 & 0.0 & 0.0 & 0.0 & 0.283 \\ \(G_{dry}^{m}\), kg/m\({}^{2}\) & 0.148 & 0.138 & 0.0 & 0.0 & 0.0 & 0.0 & 0.064 \\ \hline Amount of condensate falling out for the entire period of moisture accumulation per year, kg/m\({}^{2}\) & 0.350 & \multicolumn{1}{c}{} & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Determination on the amount of condensing moisture per year. For the city of Rostov-on-Don (Figure 5a), it has been established that condensate will form when finishing aerated concrete blocks of grades D350 and D400 with cement-sand plaster and a DBM of Knauf GRUNBAND. However, the use of the developed DBM can prevent condensate formation regardless of the aerated concrete grade. Condensate will only form during the winter months in Rostov-on-Don. In the conditions in Voronezh (Figure 5b), condensate will form when finishing aerated concrete blocks of grades D350, D400, and D500 with cement-sand plaster, as well as when finishing aerated concrete blocks of grades D350 and D400 with a DBM of Knauf GRUNBAND.