## 3 Repair Materials
### Test Results  
With respect to the crack behavior test results of the repair materials injected into the artificial crack, the status of the repair materials is summarized in Table 6 and Figure 11. In addition, the water tightness of the repair materials as determined through the permeability test (determination of re-leakage risk after the occurrence of the crack behavior) done after the completion of the crack behavior test is shown in Table 7 and Figure 12. The status of the repair materials for each series as shown in the crack behavior and permeability tests is shown below. Figure 11: Leakage repair material (by series) behavior response cycle. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Division** & **Naked-Eye Observation** & **Comprehensive Judgment** \\ \hline RG & & & RG-1: Passed (leaks occurred) \\ RG-2: Passed (fewer leaks occurred compared to RG-1) & & RG-2: Passed (fewer leaks occurred compared to RG-1) \\ RG-1 & RG-2 & RG-3 \\ CG & & & CG-1, 2, 3: Failed (interfacial detachment occurred immediately after the test) \\ AG & & & AG-1: Passed (excitation occurred) \\ AG & & & AG-2: Failed (interfacial detachment occurred at an average of 69 cycles) \\ AG-1 & AG-2 & AG-3 \\ EG & & & AG-1: Passed (excitation occurred) \\ AG & & & AG-2: Failed (interfacial detachment occurred at an average of 72 cycles) \\ EG & & & AG-1, 2, 3: Failed (specimen damage occurred) \\ EG-1 & EG-2 & EG-3 \\ UG & & & CG-1: Failed(interfacial detachment occurred at an average of 41 cycles) \\ UG-2 & & & UG-2: Failed(interfacial detachment occurred at an average of 71 cycles) \\ UG-3: Passed (excitation occurred) \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Status of the specimens after the crack behavior test. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Division** & **Presence and absence of water leakage** & **Comprehensive judgment** \\ \hline RG & & & RG-1: Permeable (1), not permeable (2) \\ RG-2: Permeable (3) & & RG-3: Permeable (1), not permeable (2) \\ RG-1-1 & RG-2 & RG-3-3 & \\ CG & & Failed & CG-1, 2, 3: Failed (failure in crack behavior responsiveness occurred) \\ CG-1 & CG-2 & CG-3 & \\ \hline AG & & Failed & AG-1: Failed (permeable for 34 min on average) \\ GA & & & AG-2, 3: Failed (failure in crack behavior responsiveness occurred) \\ AG-1 & AG-2 & AG-3 & \\ EG & & Failed & EG-1, 2, 3: Failure (failure in crack behavior responsiveness occurred) \\ EG & & & EG-1 & EG-2 \\ EG-1 & EG-2 & EG-3 & \\ UG & & Failed & CG-1, 2: Failed (failure in crack behavior responsiveness occurred) \\ UG & (failure in crack behavior responsiveness) & & CG-3: Failed (permeable for 26 min on average) \\ UG-1 & UG-2 & UG-3 & \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Status of the specimens after the permeability test. (1) Synthetic-Rubber-Based (RG) Repair Materials  
The crack behavior test results showed that all the nine specimens responded to the 100-cycle crack behaviors. The observation with the unaided eye after the completion of the crack behavior test revealed that RG-1 sustained leaks due to its low viscosity whereas RG-2 and RG-3 showed fewer leaks than RG-1 due to their higher viscosity compared to RG-1. In the permeability test, RG-1 and RG-3 exhibited permeability in one of the three specimens, and RG-2 was shown to be impermeable in all the three specimens. (2) Cement-Based (CG) Repair Materials  
Based on the crack behavior test results, all the nine specimens of CG-1, CG-2, and CG-3 were determined to be \"failures\" as they showed the phenomenon of being detached from the main body immediately after the start of the crack behavior test. Therefore, the permeability test was not conducted. (3) Acrylic-Based (AG) Repair Materials  
The crack behavior test results showed that in the case of AG-1, phenomena such as leaks and detachment did not occur in the nine specimens, but the excitation phenomenon was observed on the adhesive surface of the specimens and in the materials of three specimens. They, however, were all found to have passed the 100-cycle crack behavior test.