# Electro-Thermal Properties of Carbon-Fiber-Reinforced Mortar Prisms
## 4 Experimental Results
The ratio differences between the 0.5% and 2.0% prisms are 0.221 (0.1). This may mean that the temperature distribution patterns of the volumes underneath the surfaces become more uniform and similar to those of their corresponding percentage prisms. In any case, the temperatures indicate that the average temperature increments of the surfaces are the highest for the case of 1 to 3 min heating. However, the time period is 2 times that of the first 1 min case. When this time length is considered, the first 1 min heating induces the highest temperature increment for all the prisms. 6. The average temperature of the 2.0% prism is higher than that of the 1.5% for 3 min heating. This is probably caused by the light weight of the 2.0% prism compared with the 1.5% one and the resistance decrease in 2.0% prism as explained before. Figure 7 shows the temperature distributions along the vertical bisect lines of the dotted rectangles in Figure 4:2 The distribution pattern has a non-uniform shape because of the non-uniform distribution of fibers with different resistances along the line. The numbers in these distributions represent the average temperature of the distributions. However, since the default value of the maximum temperature recorded is 160.2\({}^{\circ}\), the top parts of the waveforms for the 2.0% prism are missed for the 3- and 5-minute heating. It is also noticed that the average temperature values of the 1.5% prisms are higher than those of the 2.0%, but the peak intensity values are opposite. This informs that the temperature, i.e., the heat in the 1.5% prisms is more distributed than that in the 2.0% prisms. Figure 7 shows that the waveforms of the distributions at 1, 3 and 5 minutes heating for each percentage prism are of almost the same shape. This means that the temperature ratio of one point \(\underline{q}\) to another point \(\underline{b}\) on each of these lines is a fixed value for a prism. The average temperature increment is within 20.2\({}^{\circ}\) (0.5%) to 50.8\({}^{\circ}\) (1.5%) for first 1 min, 19.5\({}^{\circ}\) (0.5%) to 26.9\({}^{\circ}\) (1.5%) for 1 to 3 min, and 10.3\({}^{\circ}\) (1.0%) to 13.9\({}^{\circ}\) (2.0%) for 3 to 5 min. The temperature increment is the highest for the first 1 min of heating and then reduces as the heating time increases. In fact, the temperature increment for the first 1 min is much higher than those for 1 to 3 min and 3 to 5 min. These increment characteristics closely match \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**Prisms**} & \multicolumn{5}{c}{**Temperature Increment**} & \multirow{2}{*}{**Remark**} \\ \cline{2-2} \cline{4-7}  & & **Incre.** & **1 min** & **Incre.** & **3 min** & **Incre.** & **5 min** \\ \hline
0.5\% & 8.6\({}^{\circ}\) & 8.6\({}^{\circ}\) & 13.9 & 22.5 & 10.8 & 33.3 & \multirow{2}{*}{
\begin{tabular}{c} Incre.: Increment -\(>\) \\ Temperature increment between \\ heating periods \\ \end{tabular} } \\
1.5\% & 15.6 & 15.6 & 14.5 & 30.1 & 11.5 & 41.6 & \\
2.0\% & 15.0 & 15.0 & 21.2 & 36.2 & 10.7 & 46.9 & \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Prisms’ temperature increments for three different heating time periods of the first 1 min, 1 to 3 min and 3 to 5 min. those of the broken rectangles specified in Figure 6. However, the average temperature of the surface does not follow this increment pattern. Figures 8 and 9 show the temperature distributions of the horizontal line at 3 mm distance from the bottom edge of the piece and the horizontal line bisecting the prism piece into two horizontal parts, respectively, for the 0.5%, 1.0%, 1.5% and 2.0% prisms. They show that the temperature distributions of the horizontal bisecting line are smoother than that of the 3 mm distance horizontal line, though the 1.5% case does not show much difference between them. This may be caused by its unique heating pattern, shown in Figure 6.  
Figure 8: The temperature distribution pattern of along the line representing the highest temperature zone.