## 3 Results and Discussion
### Effects of Immersion Durations on Tensile Strength
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \begin{tabular}{c} **CK** \\ **(wt. \%)** \\ \end{tabular} & **Solutions** & \(T\) (\({}^{\circ}\)**C)** & \
\begin{tabular}{c} **P** \\ **(Months)** \\ \end{tabular} & **NS** & **AV (N)** & **SD (N)** &
\begin{tabular}{c} **Scheff’s Test** \\ **(Immersion Period)** \\ \end{tabular} \\ \hline \multirow{4}{*}{5} & \multirow{4}{*}{CH\({}_{3}\)COOH} & & 0 & 5 & 113.70 & 6.07 & \multirow{4}{*}{1 \textless{} 0} \\  & & 1 & 4 & 87.75 & 13.60 & \multirow{4}{*}{1 \textless{} 0} \\  & & 2 & 4 & 91.63 & 10.95 & & \\  & & 3 & 4 & 93.53 & 10.16 & & \\  & & 4 & 4 & 90.52 & 10.79 & & \\ \hline \multirow{4}{*}{10} & \multirow{4}{*}{CH\({}_{3}\)COOH} & & 0 & 5 & 116.32 & 11.53 & \multirow{4}{*}{-} \\  & & 1 & 4 & 119.73 & 11.11 & & \\  & & 2 & 4 & 113.33 & 16.28 & & \\  & & 3 & 4 & 103.97 & 11.76 & & \\  & & 4 & 4 & 97.69 & 13.61 & & \\ \hline \multirow{4}{*}{15} & \multirow{4}{*}{CH\({}_{3}\)COOH} & & 0 & 5 & 117.72 & 11.80 & \multirow{4}{*}{-} \\  & & 1 & 4 & 123.53 & 5.29 & & \\  & & 2 & 4 & 114.43 & 14.48 & & \\  & & 3 & 4 & 103.80 & 6.73 & & \\  & & 4 & 4 & 92.27 & 10.73 & & \\ \hline \multirow{4}{*}{20} & \multirow{4}{*}{CH\({}_{3}\)COOH} & & 0 & 5 & 119.14 & 9.95 & \multirow{4}{*}{-} \\  & & 1 & 4 & 108.98 & 5.11 & & \\  & & 2 & 4 & 108.00 & 15.91 & & \\  & & 3 & 4 & 108.22 & 4.46 & & \\  & & 4 & 4 & 98.62 & 5.82 & & \\ \hline \multirow{4}{*}{0} & \multirow{4}{*}{CH\({}_{3}\)COOH} & & 0 & 5 & 105.82 & 9.50 & \multirow{4}{*}{4 \textless{} 0} \\  & & 1 & 4 & 95.83 & 12.34 & & \\  & & 2 & 4 & 91.95 & 16.41 & 4 \textless{} 0 \\  & & 3 & 4 & 92.12 & 8.39 & \\  & & 4 & 4 & 73.91 & 7.54 & \\ \hline \multirow{4}{*}{5} & \multirow{4}{*}{CH\({}_{3}\)COOH} & & 0 & 5 & 113.70 & 6.07 & \multirow{4}{*}{2, 3, 4 \textless{} 0} \\  & & 1 & 4 & 94.40 & 12.24 & & \\  & & 2 & 4 & 81.95 & 10.25 & & \\  & & 3 & 4 & 78.60 & 16.74 & & \\  & & 4 & 4 & 74.45 & 8.88 & & \\ \hline \multirow{4}{*}{10} & \multirow{4}{*}{CH\({}_{3}\)COOH} & & 0 & 5 & 116.32 & 11.53 & \multirow{4}{*}{4 \textless{} 0} \\  & & 1 & 4 & 101.98 & 19.91 & & \\  & & 2 & 4 & 103.73 & 15.32 & & \\  & & 3 & 4 & 90.83 & 15.20 & & \\  & & 4 & 4 & 71.93 & 5.03 & & \\ \hline \multirow{4}{*}{15} & \multirow{4}{*}{CH\({}_{3}\)COOH} & & 0 & 5 & 117.72 & 11.80 & \multirow{4}{*}{4 \textless{} 0} \\  & & 1 & 4 & 113.98 & 15.81 & & \\  & & 2 & 4 & 95.78 & 12.48 & & \\  & & 3 & 4 & 91.30 & 14.34 & & \\  & & 4 & 4 & 88.54 & 18.97 & & \\ \hline \multirow{4}{*}{20} & \multirow{4}{*}{CH\({}_{3}\)COOH} & & 0 & 5 & 119.14 & 9.95 & \multirow{4}{*}{4 \textless{} 0} \\  & & 1 & 4 & 105.23 & 7.61 & & \\ \cline{1-1}  & & 2 & 4 & 92.30 & 8.34 & & \\ \cline{1-1}  & & 3 & 4 & 95.27 & 7.79 & & \\ \cline{1-1}  & & 4 & 4 & 88.26 & 5.59 & & \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Cont. environment that has a pH below 13, the strong alkali solution is used in this study in order to examine the alkali resistance of recycled Kevlar(r)/PET/LPET nonwoven geotextiles. The control group (_i.e._, PET/LPET nonwoven geotextile) has a complete decomposition in a NaOH solution. However, the remaining tensile strength of the experimental group is 3%-5%. This indicates that the incorporation of Kevlar(r) fibers improves the tensile strength of the nonwoven geotextiles. Strong alkali results in the decrease in the tensile strength of the experimental group because PET fibers undergo hydrolysis. Similarly, [PERSON] _et al._ state that PET is subjected to a hydrolysis as a result of being exposed to an acid or an alkali environment [15], while [PERSON] _et al._ points out that a combination of water and an acid, alkali, or neutral environment renders PET with a hydrolysis that involves the depolymerization of PET to terephthalatic acid (TPA), and that can be aggravated by applying a high temperature [24].