## 3 Results and Discussion
### Flexural Response  
As mentioned in Section 2, data acquisition was carried out from 3 load cells and 4 LVDT. All specimens developed a first and major crack near mid-span (Figure 4). In the first step, the support reactions and displacements at 100 mm from the supports were used to cross-check the validity of the test and the data to be used in the analysis. Figure 5 shows an example of the crosscheck (corresponding to data from testing uncorroded F40 RC). Figure 4: Dominant crack at mid-span. Figure 5: Validation of test data: **(a)** for force; **(b)** for displacement. Similar plots were obtained for all tests. The reaction at the supports corresponds to half of the applied load, and the overlap of symmetrical measurements is remarkable. It is also worth noticing the similarity of displacements on opposite faces. In a second step, the net deflection at midspan was computed, using the intermediate deflections and beams theory equations. Finally, the load-displacement curves for each composite (F80 ZP, F40 ZP, and F40 RC) and corrosion condition (uncorroded (NC), intermediate (IC) and severe (SC)) were plotted. Further, flexural performance indicators, summarized in Tables 4-6, were computed. A displacement ductility index, \(i\), was computed, following the definition of [39] (Figure 6), along with the ASTM [11] toughness index \(I_{5}\) (Figure 7a) and the JSC [40] flexural toughness \(T_{b}\) (Figure 7b). \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Condition** & **NC** & **IC** & **SC** \\ \hline \(P_{\sigma\sigma}\) (kN) & 6.3 & 5.8 (\(-8\%\)) & 4.0 (\(-39\%\)) \\ \(P_{max}\) (kN) & 8.9 & 10.7 (\(+20\%\)) & 7.2 (\(-19\%\)) \\ \(i\) & 4.3 & 10.5 (\(+145\%\)) & 21 (\(+384\%\)) \\ \(I_{5}\) & 2.9 & 7.4 (\(+157\%\)) & 5.2 (\(+81\%\)) \\ \(T_{b}\) (J) & 21 & 18 (\(-16\%\)) & 13 (\(-38\%\)) \\ \(f_{MOR}\) (MPa) & 10.7 & 12.8 (\(+20\%\)) & 8.6 (\(-19\%\)) \\ \(f_{e}\) (MPa) & 3.2 & 2.7 (\(-16\%\)) & 2.0 (\(-38\%\)) \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Flexural performance indicators for F40 RC (relative variation between brackets). \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Condition** & **NC** & **IC** & **SC** \\ \hline \(P_{\sigma\sigma}\) (kN) & 9.2 & 8.1 (\(-12\%\)) & 3.1 (\(-66\%\)) \\ \(P_{max}\) (kN) & 15.4 & 13.3 (\(-13\%\)) & 5.8 (\(-63\%\)) \\ \(i\) & 17.9 & 15.3 (\(-14\%\)) & 4.0 (\(-78\%\)) \\ \(I_{5}\) & 2.3 & 8.8 (\(+288\%\)) & 11.6 (\(+411\%\)) \\ \(T_{b}\) (J) & 31 & 21 (\(-32\%\)) & 6.5 (\(-79\%\)) \\ \(f_{MOR}\) (MPa) & 18.5 & 16.0 (\(-13\%\)) & 6.9 (\(-63\%\)) \\ \(f_{e}\) (MPa) & 4.6 & 3.2 (\(-32\%\)) & 1.0 (\(-79\%\)) \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Flexural performance indicators for F80 ZP (relative variation between brackets). Figure 6: Definition of displacement ductility index. Besides these indexes, peak load \(P_{max}\), modulus of rupture\(f_{MOR}\) (Equation (1)), and equivalent flexural strength\(f_{e}\) (Equation (2)) were also considered. \[f_{MOR}=\frac{3P_{max}L}{bh^{2}}, \tag{1}\]  
where \(P_{max}\) is the peak load, \(L\) is the distance between supports, and \(b\) and \(h\) are the width and height of the specimen's cross section, respectively. \[f_{e}=\frac{150T_{b}}{bh^{2}}, \tag{2}\]  
where \(T_{b}\) is JSCE flexural toughness, and \(b\) and \(h\) are the width and height of the specimen's cross-section, respectively. The results of these performance indicators are presented in Table 4.  
Figure 8 depicts the flexural behavior of the different composites at the same corrosion level. The composite with a higher fiber content (F80 ZP) exhibited the maximum peak load, which is in accordance with the conclusions of the statistical analysis of the flexural strength of SFRC, i.e., the most influential parameter in SFRC flexural strength is the fiber content. Composites F40 ZP and F40 RC, with identical fiber content, showed similar peak loads. The equivalent flexural strengths of non-corroded composites with a fiber content of 40 kg/m\({}^{3}\) are comparable to those of [PERSON] et al.