## 4 Discussion  
The study's conclusions are as follows. * The cutting mill enables accurate and efficient cutting of WFT and WFR into fibers, overcoming the constraints of manual techniques. The numerous sieve sizes of 4 mm, 8 mm, 10 mm, and 20 mm offer flexibility in collecting fibers of various lengths, enhancing the range of use. * Analysis of fiber size distribution shows that the cutting mill generates fibers that are predominantly centered around their respective sieve sizes. Smaller sieve sizes lead to narrower curves, showing less variation in fiber length. This knowledge is crucial for comprehending and managing the characteristics of the cementitious materials produced. * The natural cleaning process of WFT and WFR had favorable outcomes, as the salt content was effectively lowered to the target level over a period of 6 months when exposed to rain and wind. Despite the lengthy duration, the cleaning of WFT and WFR does not require any mechanical energy or manpower. Simply position them outside without any other requirements. However, mechanical cleaning remains a viable option in cases when the cleaning of WFT and WFR is time-sensitive and there is no room for delay. Nevertheless, it should be noted that this method would be inefficient and detrimental to the environment. * Studying how different fiber sizes and proportions affect the mechanical properties of CM is a critical part of the research. The study indicates that fibers acquired through a 20 mm sieve produce the best results when added to the cementitious material, and a fiber volume fraction of 0.5% yields the most advantageous effects. By augmenting the fiber concentration, clusters of fibers may form, leading to an increase in voids within the mortar and a subsequent decrease in its density. Figure 21a depicts the distribution of fiber that was added at a volume concentration of 0.5%. In contrast, the figure on the right illustrates the development of clusters after the fiber concentration was increased to 1%, which could be the cause of the reduction in the mechanical resistance of the mortar. * The workability of MC was affected differently by the presence of WFT and WFR fibers. The MC with WFT fibers showed a lesser reduction in workability compared to the MC with WFR fibers. Hence, the significance of fiber type in controlling the workability of the mortar is underscored. Furthermore, there was a direct correlation seen between the length of fibers and the decrease in workability. This highlights the need for conducting a comprehensive analysis of the fiber dimensions in order to properly address any possible difficulties associated with workability in CM. To address the problem of decreased workability, one might examine the selection of superplasticizer and the adjustment of the water/cement ratio. Nevertheless, using this method may lead to a decrease in mechanical characteristics. Hence, it is important to thoroughly investigate the optimal equilibrium among workability, water/cement \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Sample Type**} & \multicolumn{4}{c}{**Toughness Index**} & \multirow{2}{*}{**R\({}_{\text{5,10}}\)**} & \multirow{2}{*}{**R\({}_{\text{10,20}}\)**} \\ \cline{2-2} \cline{4-6}  & **I\({}_{\text{5}}\)** & **I\({}_{\text{10}}\)** & **I\({}_{\text{20}}\)** & \\ \hline MWFT-20 & 2.32 & 3.55 & 6.32 & 24.61 & 27.68 \\ \hline MWFR-20 & 2.25 & 3.21 & 4.76 & 19.07 & 15.50 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Toughness indices and residual strength factors for mortar prepared using WFT-20 and WFR-20 fibers. ratio, and the use of superplasticizers. This might provide a novel study topic for future investigation. The experiment shows a significant rise in porosity in CM when fibers are added. The results indicate that porosity shows a minor rise when fiber length increases, but a more significant increase is observed with larger fiber fractions.