# Influence of Variotropy on the Change in Concrete Strength under the Impact of Wet-Dry Cycles
## 3 Results
\begin{table}
\begin{tabular}{c c c c c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Type of Concrete**} & \multicolumn{10}{c}{**Number of Wetting and Drying Cycles**} \\ \cline{2-13}  & **0** & **50** & **100** & **150** & **200** & **250** & **300** & **350** & **400** & **450** & **500** & **550** & **600** \\ \hline \multirow{4}{*}{Vibrated} & 0 & -4 & -5 & -7 & -8 & -12 & -16 & -19 & -23 & -25 & -30 & -33 & -36 \\ \cline{2-13}  & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} \\ \cline{2-13}  & 0 & -5 & -8 & -10 & -11 & -14 & -17 & -21 & -24 & -25 & -29 & -32 & -37 \\ \hline \multirow{4}{*}{Centrifuged} & 0 & -2 & -4 & -6 & -9 & -11 & -13 & -14 & -18 & -21 & -24 & -27 & -28 \\ \cline{2-13}  & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} \\ \cline{2-13}  & 0 & -1 & -5 & -7 & -10 & -12 & -14 & -15 & -17 & -21 & -23 & -24 & -26 \\ \hline \multirow{4}{*}{Vibrocentrifuged} & 0 & -1 & -3 & -4 & -6 & -8 & -9 & -11 & -13 & -15 & -16 & -19 & -21 \\ \cline{2-13}  & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} \\ \cline{2-13}  & 0 & -2 & -3 & -5 & -7 & -9 & -11 & -12 & -14 & -15 & -17 & -18 & -20 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Change in the strength characteristics of vibrated, centrifuged, and vibrocentrifuged concretes after cyclic wetting and drying at pH 5. \begin{table}
\begin{tabular}{c c c c c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Type of Concrete**} & \multicolumn{10}{c}{**Number of Wetting and Drying Cycles**} \\ \cline{2-13}  & **0** & **50** & **100** & **150** & **200** & **250** & **300** & **350** & **400** & **450** & **500** & **550** & **600** \\ \hline \multirow{4}{*}{Vibrated} & 0 & 2 & 5 & 8 & 11 & 9 & 6 & 1 & -4 & -8 & -13 & -16 & -20 \\ \cline{2-13}  & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} \\ \cline{2-13}  & 0 & 3 & 6 & 9 & 12 & 8 & 4 & 2 & -5 & -10 & -14 & -19 & -22 \\ \hline \multirow{4}{*}{Centrifuged} & 0 & 4 & 6 & 10 & 13 & 9 & 6 & 3 & -2 & -7 & -10 & -12 & -14 \\ \cline{2-13}  & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} \\ \cline{2-13}  & 0 & 5 & 7 & 11 & 14 & 10 & 6 & 5 & -3 & -5 & -11 & -12 & -15 \\ \hline \multirow{4}{*}{Vibrocentrifuged} & 0 & 5 & 9 & 13 & 15 & 11 & 8 & 6 & -1 & -3 & -8 & -9 & -10 \\ \cline{2-13}  & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} & \multicolumn{10}{c}{} \\ \cline{2-13}  & 0 & 6 & 8 & 11 & 16 & 12 & 9 & 7 & -2 & -4 & -6 & -9 & -11 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Change in the strength characteristics of vibrated, centrifuged, and vibrocentrifuged concretes after cyclic wetting and drying at pH 7. Figures 8 and 9 show the dependences of the change in cubic and prism compressive strengths of vibrated, centrifuged, and vibrocentrifuged concretes in a moistening medium with pH 5. Figures 7 and 8 show that the nature of the change in the strength characteristics of vibrated, centrifuged, and vibrocentrifuged concrete is slightly different from the previous tests presented in Figures 6 and 7.