## 3 Results and Discussion
### Complementary Physical Characterization Tests
\begin{table}
\begin{tabular}{c c c c c c c} \hline
**Property** & **Source** & **Sum of Squares** & **Df** & **Mean Square** & **F-Ratio** & **\(p\)-Value** \\ \hline Hardness (Ud. Shore D) & A: Dosage & 21.33333 & 1 & 21.33333 & 5.82 & 0.0424 \\  & B: Fiber type & 0.33333 & 1 & 0.33333 & 0.10 & 0.7655 \\  & AB: Interactions & 1.33333 & 1 & 1.33333 & 0.38 & 0.5543 \\  & Residual & 28.0000 & 8 & 3.50000 & & \\  & Total (Corrected) & 35.0000 & 11 & & & \\ \hline Bulk Density (kg/m\({}^{3}\)) & A: Dosage & 18,174.10 & 1 & 18,174.100 & 48.47 & 0.0001 \\  & B: Fiber type & 1564.08 & 1 & 1564.080 & 4.17 & 0.0754 \\  & AB: Interactions & 6.75 & 1 & 6.750 & 0.02 & 0.8966 \\  & Residual & 2999.33 & 8 & 374.917 & & \\  & Total (Corrected) & 22,744.30 & 11 & & & \\ \hline Adherence (MPa) & A: Dosage & 0.00480 & 1 & 0.00480 & 36.00 & 0.0003 \\  & B: Fiber type & 0.01080 & 1 & 0.01080 & 81.00 & 0.0000 \\  & AB: Interactions & 0.00013 & 1 & 0.00013 & 1.00 & 0.3466 \\  & Residual & 0.00107 & 8 & 0.00013 & & \\  & Total (Corrected) & 0.01680 & 11 & & & \\ \hline Absorption (kg/mm\({}^{2}\)min\({}^{0.5}\)) & A: Dosage & 0.02901 & 1 & 0.02901 & 145.04 & 0.0000 \\  & B: Fiber type & 0.00701 & 1 & 0.00701 & 35.04 & 0.0004 \\  & AB: Interactions & 0.00007 & 1 & 0.00007 & 0.37 & 0.5573 \\  & Residual & 0.00160 & 8 & 0.00020 & & \\  & Total (Corrected) & 0.03769 & 11 & & & \\ \hline \end{tabular}
\end{table} 
Table 11: Analysis of variance (ANOVA) for flexural and compressive mechanical strengths. As can be seen in Table 12, for the multiple range test considering the dosage factor that takes into account the cement/aggregate ratio, there are significant differences for all the tests performed. Thus, it can be stated that by increasing the cement/aggregate ratio from 1:3 to 1:4, all the properties studied in this section decrease [86]. However, after the analysis of Table 13, it can be seen that the incorporation of fibers is only a significant factor in the case of adhesion, where it has a negative influence on this property, and for water absorption by capillarity, where the incorporation of aramid fibers is beneficial for mortars made with recycled concrete aggregate. As can be seen in Figure 6, all the samples tested obtained a decrease in their mechanical flexural strength when subjected to the 25 freeze-thaw cycles compared to identical samples of the same age and without cycles. It can be seen in Table 14 how this decrease in strength and mass loss is greater in mortars made with recycled concrete aggregate than for traditional mortars. In addition, the beneficial effect of incorporating aramid fibers in the mortar matrix is also evident, since the mixes made with recycled aggregate and incorporation of fibers showed similar flexural strength results to the mortars made with natural aggregate and obtained even lower mass losses than the traditional mortars. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Property** & **Fiber** & **Count** & **LS Mean** & **LS Sigma** & **Homogeneous Group** \\ \hline Hardness (Ud. Shore D) & NF & 6 & 71.70 & 0.781736 & X \\  & AF & 6 & 71.35 & 0.781736 & X \\ \hline Bulk Density (kg/m\({}^{3}\)) & NF & 6 & 1792.83 & 7.90482 & X \\  & AF & 6 & 1815.67 & 7.90482 & X \\ \hline Adherence (MPa) & AF & 6 & 0.34 & 0.004714 & X \\  & NF & 6 & 0.40 & 0.004714 & X \\ \hline Absorption (kg/mm\({}^{2}\)min\({}^{0.5}\)) & NF & 6 & 0.665 & 0.005774 & X \\  & AF & 6 & 0.713 & 0.005774 & X \\ \hline \hline \end{tabular}
\end{table} 
Table 13: Multi-range test the complementary tests considering the incorporation of aramid fibers. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Property** & **N-1:3** & **NA-1:4** & **RA-1:3** & **RA-1:4** & **RA-1:3-FA** & **RA-1:4-FA** \\ \hline \hline
**\(\boldsymbol{\
abla}\) Mass (g)** & 9.73 & 11.73 & 15.43 & 19.03 & 11.30 & 16.03 \\ \hline
**\(\boldsymbol{\
abla}\) Flexural Strength (\%)** & 4.49 & 5.80 & 6.31 & 8.67 & 3.84 & 5.38 \\ \hline \hline \end{tabular}
\end{table}