## 2 Materials and Methods
### Experimental Method  
Prismatic specimens of 100 mm \(\times\) 100 mm \(\times\) 350 mm and a cylindrical specimen (100 \(\times\) 200) mm were fabricated to evaluate the compressive and flexural performance of the polymer SIFRCCs with respect to the steel fiber volume fraction. Bending and compressive tests were conducted based on ASTM C 1609 and ASTM C39, respectively [26; 27]. Figure 3 shows the compressive test and flexural strength test set up using a 200-ton universal testing machine that was provided by Dong Ah Testing Machine. In addition, the deflection displacement at the center was measured, in which two linear variable differential transducers (gauge length 25 mm) were attached. The load was applied at the rate of 1 mm/min. in the displacement control method for both compressive and flexural test. Ten specimens for each variable were tested. In addition, for compressive strength, the specimens were centrally placed between the two compression plates, such that the center of the moving head was above the center of the specimen. Subsequently, the load was applied on the specimens by moving the movable head. The load and corresponding contraction were measured at different intervals. Previous studies on the mechanical properties of high-strength concrete and fiber-reinforced concrete showed that there was an applicable strength limit for each prediction equation [28; 29; 30; 31; 32; 33; 34]. Equation 1 was utilized to calculate the flexural strength.  
\[f=\frac{PL}{bd^{2}} \tag{1}\]  
Here, \(f\) is the flexural strength; \(P\) is the maximum load measured in the experiment; \(L\) is the span distance (300 mm); \(b\) is the specimen width (100 mm); and, \(d\) is the specimen height (100 mm).  
The specimen was heated for 1 hr in accordance with the KS F 2257 (ISO 834) standardized material temperature curve in a high temperature furnace to analyze the flexural and compressive strengths of the polymer-containing SIFRCCs subjected to a high temperature (about 945 \({}^{\circ}\)C) [35]. The experiment was conducted with only one side exposed to the high temperature using fire resistance fiber cerawool. The average temperature inside the high temperature furnace was adjusted according to equation  
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**W/B** & **OPC** & **Silica Fume** & \
\begin{tabular}{c} **Polymer** \\ **(V\({}_{t}\) \%)** \\ \end{tabular} & **FA** & **HRWR** & **SRA** &
\begin{tabular}{c} **Steel Fiber** \\ **(V\({}_{t}\) \%)** \\ \end{tabular} \\ \hline \multirow{3}{*}{0.35} & \multirow{3}{*}{1} & \multirow{3}{*}{0.15} & 0.5 & \multirow{3}{*}{0.5} & \multirow{3}{*}{0.025} & \multirow{3}{*}{0.005} & \multirow{3}{*}{5} \\  & & & 1.0 & & & & \\ \cline{1-1} \cline{6-8}  & & & 1.5 & & & & \\ \hline \hline \end{tabular}
\end{table}
Table 1: Mix proportion ratio.  
Figure 3: Experimental set up for the specimen before high temperature exposure: (**a**) Experimental set up for the compressive strength test before high temperature exposure; and, (**b**) Experimental set up for the bending test with third point loading before high temperature exposure.  
2 [35]. Figure 4 shows KS F 2257 (ISO 834) standardization temperature curve [35] and Figure 5 shows the specimens after exposure to high temperature. The KS F 2257 (ISO 834) curve below represents that temperature increases with time at a constant rate. It is used to test the fire resistance of materials with the fire hazard rating based on the burning rate of general combustible building materials and building contents [35].  
\[T=345 log_{10}(8t+1)+20 \tag{2}\]  
Here, \(T\) is the average temperature in degree Celsius inside the furnace and \(t\) represent time in minutes.