## 4 Conclusions  
The literature indicates that corrosion in SFRC is less serious than in conventionally reinforced concrete. Also, the results of short-term experiences have shown limited corrosion-induced damage to SFRC. This causes the issue of stray current-induced corrosion, which has been overlooked, together with other particular conditions that can cause severe corrosion.  
The influence of corrosion on the flexural behavior of SFRC was studied. It was found that:  
1. Severe corrosion may cause a loss of maximum bearing capacity of up to 65%, and up to 81% in flexural toughness or equivalent flexural strength.
2. In general, the highest losses were found in the composite with a higher fiber content. Composites with RC fibers (smaller diameter) showed the lowest losses in maximum bearing capacity and flexural toughness.
3. It was confirmed that beyond a certain corrosion threshold, the fiber failure shifts from pullout to rupture.  
\begin{table}
\begin{tabular}{c c c} \hline \hline
**Condition** & **IC** & **SC** \\ \hline F80 ZP & 2.07\% & 2.65\% \\ F40 ZP & 4.76\% & 4.04\% \\ F40 RC & 4.91\% & 3.02\% \\ \hline \hline \end{tabular}
\end{table}
Table 7: Fiber corrosion degree.  
The displacement ductility and toughness indexes did not show an association with the corrosion level.
* The attained corrosion levels, even those considered intermediate, caused a decrease in flexural performance, as evaluated per cracking load, peak load, toughness, modulus of rupture, and equivalent flexural strength indicators.  
Even though, in other investigations, an improvement in flexural performance for light corrosion is reported, this study proved that fiber corrosion may have a quite significant impact on the flexural behavior of SFRC; thus, it is a factor that cannot be neglected, even if a low quantitative level of fiber corrosion is attained. The flexural performance improvement reported in the literature for mild corrosion is attributed to the fact that the smaller volume of generated corrosion products was enough to build up fiber confinement but insufficient to cause microcracking around corroded fiber, as happened to a certain degree with thinner fibers in this work.  
For future research, it is considered interesting to:  
1. Assess the implications of equivalent corrosion levels in the mechanical properties of concrete reinforced with conventional steel bars having the same volume of steel, allowing a fair comparison between the impacts of steel corrosion in SFRC and conventional reinforced concrete.
2. Cause mild corrosion in the composites used in this research, using the corrosion techniques found in the literature, to broaden the quantification of corrosion influence in the flexural performance of steel fiber-reinforced concrete for a wider range of corrosion severity.
3. Consider other than hooked fiber shapes and different fiber tensile strengths (namely fibers recycled from decommissioned steel elements), to investigate whether, under a certain corrosion degree, fiber failure occurs by fiber rupture or pull-out.  
Conceptualization, R.N.; methodology, M.F. and R.N.; validation, R.N.; formal analysis, M.F.; investigation, M.F.; resources, R.N.; data curation, R.N.; writing--original draft preparation, M.F.; writing--review and editing, R.N. and M.F.; supervision, R.N. All authors have read and agreed to the published version of the manuscript.  
This research received no external funding.  
Not applicable.  
Data Availability Statement: Data are contained within the article.  
Technical support from [PERSON] is deeply acknowledged.  
The authors declare no conflicts of interest.