## 3 Results and Discussion
### Investigations on TRC Coupons
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multirow{2}{*}{**Specimen**} & \multirow{2}{*}{\begin{tabular}{c} **E\({}_{1}\)** \\ **GPa** \\ \end{tabular} } & \multirow{2}{*}{\
\begin{tabular}{c} **E\({}_{3}\)** \\ **GPa** \\ \end{tabular} } & \multirow{2}{*}{
\begin{tabular}{c} **\(\sigma_{\text{crack}}\)** \\ **MPa** \\ \end{tabular} } & \multicolumn{2}{c}{**\# Cracks**} \\ \cline{3-8}  & & & & **MPa** & **MPa** & **MPa** & **After Cyclic** \\  & & & & & **Preloading** & **At Failure** \\ \hline \multirow{2}{*}{**REF**} & avg & 11.38 & 0.41 & 1.65 & 7.49 & - & 13 \\  & st dev & 1.94 & 0.018 & 0.54 & 0.52 & - & 2 \\ \hline \multirow{6}{*}{**CYCL**} & A & 8.99 & 0.45 & 2.19 & 6.44 & 0 & 14 \\  & B & 15.32 & 0.49 & 1.85 & 7.22 & 0 & 11 \\  & C & 11.74 & 0.37 & 1.49 & 6.43 & 0 & 19 \\  & D & 14.60 & 0.43 & 1.38 & 7.40 & 0 & 19 \\
**0.5 MPa** & E & 9.22 & 0.48 & 1.96 & 7.07 & 0 & 14 \\  & F & 12.64 & 0.43 & 2.30 & 7.32 & 0 & 17 \\ \cline{2-8}  & avg & 12.08 & 0.44 & 1.86 & 6.98 & - & 16 \\  & st dev & 2.42 & 0.038 & 0.34 & 0.40 & - & 3 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Quantitative comparison of some distinctive parameters of the static tensile stress–strain curve: the average reference versus the specimens cyclically preloaded to 0.5 MPa. Figure 11: Residual behavior of TRC CYCL. 1.0 MPa. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multirow{3}{*}{**Specimen**} & \multicolumn{2}{c}{**E\({}_{1}\)**} & \multicolumn{2}{c}{**E\({}_{3}\)**} & \multicolumn{2}{c}{\(\sigma_{\text{crack}}\)} & \multicolumn{2}{c}{\(\sigma_{\text{ultimate}}\)} & \multicolumn{2}{c}{**After Cyclic**} & \multirow{2}{*}{**At Failure**} \\  & \multicolumn{2}{c}{**GPa**} & \multicolumn{2}{c}{**GPa**} & \multicolumn{2}{c}{**MPa**} & \multicolumn{2}{c}{**MPa**} & \multicolumn{2}{c}{**MPa**} & \multicolumn{2}{c}{**Preloading**} \\ \hline \multirow{3}{*}{**REF**} & avg & 11.38 & 0.41 & 1.65 & 7.49 & - & 13 \\  & st dev & 1.94 & 0.018 & 0.54 & 0.52 & - & 2 \\ \hline \multirow{3}{*}{**CYCL.**} & avg & 0.48 & 0.48 & - & 5.55 & 22 & 24 \\  & B & 0.92 & 0.49 & 2.41 & 5.92 & 8 & 14 \\  & C & 8.37 & 0.39 & 1.53 & 5.49 & 0 & 22 \\  & D & 12.27 & 0.45 & 1.63 & 7.20 & 0 & 14 \\
**1.0 MPa** & E & 0.91 & 0.41 & 1.70 & 8.25 & 5 & 29 \\  & F & 2.59 & 0.41 & 1.20 & 7.41 & 1 & 28 \\ \cline{2-7} \cline{2-7}  & avg & - & 0.44 & 1.69 & 6.64 & - & 22 \\  & st dev & - & 0.037 & 0.40 & 1.04 & - & 6 \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Quantitative comparison of some distinctive parameters of the static tensile stress–strain curve: the average reference versus the specimens cycllely preloaded to 1.0 MPa. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multirow{3}{*}{**Specimen**} & \multicolumn{2}{c}{**E\({}_{1}\)**} & \multicolumn{2}{c}{**E\({}_{3}\)**} & \multicolumn{2}{c}{\(\sigma_{\text{crack}}\)} & \multicolumn{2}{c}{\(\sigma_{\text{ultimate}}\)} & \multicolumn{2}{c}{**After Cyclic**} & \multirow{2}{*}{**At Failure**} \\  & \multicolumn{2}{c}{**GPa**} & \multicolumn{2}{c}{**GPa**} & \multicolumn{2}{c}{**MPa**} & \multicolumn{2}{c}{**MPa**} & \multicolumn{2}{c}{**Preloading**} \\ \hline \multirow{3}{*}{**REF**} & avg & 11.38 & 0.41 & 1.65 & 7.49 & - & 13 \\  & st dev & 1.94 & 0.018 & 0.54 & 0.52 & - & 2 \\ \hline \multirow{3}{*}{**CYCL.**} & A & 0.84 & 0.42 & 2.30 & 6.74 & 7 & 22 \\  & B & 0.65 & 0.48 & 2.13 & 6.48 & 12 & 19 \\  & C & 0.81 & 0.43 & 2.41 & 5.65 & 10 & 20 \\  & D & 13.06 & 0.47 & 2.66 & 5.88 & 0 & 10 \\
**2.0 MPa** & E & 0.48 & 0.42 & 2.42 & 6.68 & 16 & 24 \\  & F & 4.76 & 0.48 & 2.24 & 7.13 & 1 & 11 \\ \cline{2-7} \cline{2-7}  & avg & - & 0.45 & 2.36 & 6.43 & - & 18 \\  & st dev & - & 0.029 & 0.17 & 0.51 & - & 5 \\ \hline \hline \end{tabular}
\end{table} 
Table 8: Quantitative comparison of some distinctive parameters of the static tensile stress–strain curve: the average reference versus the specimens cycllally preloaded to 2.0 MPa. Figure 12: Residual behavior of TRC CYCL. 2.0 MPa.