## 3 Repair Materials
\begin{table}
\begin{tabular}{c c c} \hline \hline
**Types** & **Components** & **Properties** \\ \hline \multirow{4}{*}{EG-1} & \multirow{4}{*}{Epoxy resin + amine (dry type) Main:} & (1) Two-component low-viscosity epoxy non-shrink grout \\  & & (2) Pot life: About 90 min (20 \({}^{\circ}\)C) \\  & & Hardener = 2:1 & (3) Finger touch cure time: 50 min(20 \({}^{\circ}\)C) \\  & & (4) Complete cure time: About 8 hr (35 \({}^{\circ}\)C) \\  & & (5) Exterior color: Yellowish brown (main) \\ \hline \multirow{4}{*}{EG-2} & \multirow{4}{*}{Epoxy resin + polyamidamine (wet type) Main: Hardener = 2:1} & (1) Two-component low-viscosity wet-type grout \\  & & (2) Pot life: About 60 min (25 \({}^{\circ}\)C) \\  & & (3) Finger touch cure time: 18 hr (25 \({}^{\circ}\)C) \\  & & (4) Complete cure time: 24–36 hr (25 \({}^{\circ}\)C) \\  & & (5) Exterior color: Yellowish brown (main) \\ \hline \multirow{4}{*}{EG-3} & \multirow{4}{*}{Elastic epoxy sealant Main: Hardener = 1:1} & (1) Two-component epoxy elastic sealing grout \\  & & (2) Pot life: About 60 min (23 \({}^{\circ}\)C) \\ \cline{1-1}  & & (3) Finger touch cure time: 14 hr (23 \({}^{\circ}\)C) \\ \cline{1-1}  & & (4) Complete cure time: 24–36 hr (25 \({}^{\circ}\)C) \\ \cline{1-1}  & & (5) Exterior color: White paste (main) \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Epoxy-based repair materials. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Types** & **Components** & **Properties** \\ \hline \multirow{4}{*}{CG-1} & \multirow{4}{*}{Cement, accelerator, fluidizing agent, water, other additives, etc.} & (1) Solids: 97\%–100\% \\  & & (2) Specific gravity: 1.9–2.0 \\  & & (3) Non-shrink grout non-base material \\ \hline \multirow{4}{*}{CG-2} & \multirow{4}{*}{Cement, sand, fluidizing agent, expansion agent, mixing water, etc.} & (1) Solids: 95\%–100\% \\  & & (2) Specific gravity: 1.57 \\  & & (3) Fluidizing agent expansion material \\ \hline \multirow{4}{*}{CG-3} & \multirow{4}{*}{Cement, fluidizing agent, curing regulator, water, other additives, etc.} & (1) Solids: 97\%–100\% \\  & & (2) Specific gravity: 1.32 \\ \cline{1-1}  & & (3) Ultra-rapid water-stop materials \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Cement-based repair materials. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Types** & **Components** & **Properties** \\ \hline \multirow{4}{*}{AG-1} & \multirow{4}{*}{Acrylate (metal hydroxide aqueous solution + acrylic acid + methacrylic acid), persulfate, amine (redox & (1) Mixed viscosity: Less than 5 cps \\  & & polymerization catalyst, acrylic acid meal salts, cross-linking agent, etc.} & (2) Acrylate-based water-stop agent \\  & & polymerization catalyst, acrylic acid meal salts, cross-linking agent, etc. & (3) Volume expansion: 400\% \\ \cline{2-3}  & \multirow{4}{*}{Acrylic acid metal salt, acrylamide, triethanolamine, glycerin, potassium ferricanide, sodium persulfate, etc.} & (4) Curing time: 120 seconds \\ \cline{2-3}  & & (1) Mixed viscosity: Less than 3 cps \\ \cline{2-3}  & \multirow{4}{*}{Acrylic acid metal salt, acrylamide, triethanolamine, glycerin, potassium ferricanide, sodium persulfate, etc.} & (1) Cardiac viscosity: Less than 3 cps \\ \cline{2-3}  & & (2) Cryylate-based water-stop agent \\ \hline \multirow{4}{*}{AG-3} & \multirow{4}{*}{Main (sodium polyacrylate, acrylamide- sodium acrylate, water), hardener (sulfate compounds, water), accelerant (triethanolamine, water)} & (1) Mixed viscosity: less than 20 cps \\ \cline{1-1}  & & (2) Acrylic seal grouting agent \\ \cline{1-1}  & & (3) Solubility: Soluble in water \\ \cline{1-1}  & & (4) Boiling point/melting point: 100 \({}^{\circ}\)C / \(-\)10 \({}^{\circ}\)C \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Acrylic-based repair materials.