## 3 Characteristics of SACP System with Activated-Carbon-Based Conductive Mortar
### Experimental Procedure
#### 3.1.2 Specim Preparation  
Specimens were manufactured similar to the ASTM G109-92 specimen [29], as shown in Figures 7 and 8. The mortar thickness between the concrete and rebar surfaces was 40 mm. Two parallel rebars were placed at an interval of 40 mm. The SD300 rebar was used with a diameter of 10 mm and a length of 380 mm, as shown in Figure 7. A shrinkage tube (pink area in Figure 7) was used around both ends of the rebar to guarantee the same protection area. A 250 \(\times\) 90 mm zinc mesh anode was placed between the rebar and concrete surface. The electric wire was connected from the end of the zinc mesh anode to the end of the rebar. The material composition and properties of the zinc mesh anode are  
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline  & \multicolumn{4}{c}{**Activated Carbon Mix Design (OPCS = 1.45)**} \\ \hline  & \multicolumn{2}{c}{**Admixture Ratio:**} & \multicolumn{2}{c}{**Admixture Ratio:**} & \multicolumn{2}{c}{**Admixture Ratio:**} & \multicolumn{2}{c}{**Admixture Ratio:**} \\  & \multicolumn{2}{c}{**0\%**} & \multicolumn{2}{c}{**5\%**} & \multicolumn{2}{c}{**10\%**} & \multicolumn{2}{c}{**15\%**} \\ \hline
**Material** & \begin{tabular}{c} **Weight** \\ **(g)** \\ \end{tabular} & \begin{tabular}{c} **Percentage** \\ **(\%)** \\ \end{tabular} & \begin{tabular}{c} **Weight** \\ **(g)** \\ \end{tabular} & \begin{tabular}{c} **Percentage** \\ **(\%)** \\ \end{tabular} & \
\begin{tabular}{c} **Weight** \\ **(g)** \\ \end{tabular} &
\begin{tabular}{c} **Percentage** \\ **(\%)** \\ \end{tabular} \\ \hline Cement & 348.46 & 85.28 & 348.46 & 85.28 & 348.46 & 85.28 & 348.46 & 85.28 \\ \hline \(\alpha\)-gypsum hemihydrate & 4.73 & 1.16 & 4.73 & 1.16 & 4.73 & 1.16 & 4.73 & 1.16 \\ \hline Expansion agent & 15.76 & 3.86 & 15.76 & 3.86 & 15.76 & 3.86 & 15.76 & 3.86 \\ \hline LI-T & 2.24 & 0.55 & 2.24 & 0.55 & 2.24 & 0.55 & 2.24 & 0.55 \\ \hline Latex resin & 6.31 & 1.54 & 6.31 & 1.54 & 6.31 & 1.54 & 6.31 & 1.54 \\ \hline Silica fume & 28.57 & 6.99 & 28.57 & 6.99 & 28.57 & 6.99 & 28.57 & 6.99 \\ \hline Polycarboxylic acid-based polymer & 1.13 & 0.28 & 1.13 & 0.28 & 1.13 & 0.28 & 1.13 & 0.28 \\ \hline PVA & 1.22 & 0.3 & 1.22 & 0.3 & 1.22 & 0.3 & 1.22 & 0.3 \\ \hline Dispersing agent & 0.16 & 0.04 & 0.16 & 0.04 & 0.16 & 0.04 & 0.16 & 0.04 \\ \hline Air-entraining agent & 0.03 & 0.01 & 0.03 & 0.01 & 0.03 & 0.01 & 0.03 & 0.01 \\ \hline Total powder & 408.61 & 100 & 408.61 & 100 & 408.61 & 100 & 408.61 & 100 \\ \hline Sand \#5 & 116 & 19.59 & 116 & 19.59 & 116 & 19.59 & 116 & 19.59 \\ \hline Sand \#6 & 476 & 80.41 & 446.4 & 75.41 & 416.8 & 70.41 & 387.2 & 65.41 \\ \hline Activated carbon & 0 & 0 & 29.6 & 5.00 & 59.2 & 10.00 & 88.8 & 15.00 \\ \hline Total sand & 592 & 100 & 592 & 100 & 592 & 100 & 592 & 100 \\ \hline W/M & 180 & 18 & 180 & 18 & 180 & 18 & 180 & 18 \\ \hline \hline \end{tabular}
\end{table}
Table 3: Mix design.  
presented in Table 4. An acrylic water barrier was installed on the surface to expose the specimens to water.  
Figure 8: Specim production with rebar and Zn mesh anode for CP performance evaluation. (**a**) Rebar; (**b**) Zn mesh anode; (**c**) Specim preparation; (**d**) Manufactured specimen.  
Figure 7: Drawing of conductive mortar specimen (units in mm).