## Materials and Methods
### Strength Test Methods  
The mixing ratio given in Table 6 was used to prepare polysulfide polymer concrete specimens whose compressive, flexural, and bond strengths were determined at curing temperatures of \(-\)10 \({}^{\circ}\)C, 5 \({}^{\circ}\)C, 20 \({}^{\circ}\)C, 40 \({}^{\circ}\)C, and 60 \({}^{\circ}\)C. These curing temperatures were established in a broad range based on the 30-year average measurements (30 \({}^{\circ}\)C and \(-\)4 \({}^{\circ}\)C) of the hottest and coldest months in Korea, considering the limits of the curing temperature to which polysulfide polymer concrete can be subjected. It was expected that this range would enable the evaluation of the dependence of polysulfide polymer concrete on curing temperature, and help to most effectively establish the proper curing temperature. In addition to different curing temperatures, the specimens cured at 20 \({}^{\circ}\)C were also subjected to compressive and flexural strength tests at different curing times of 3 h, 6 h, 24 h, 168 h, 336 h, and 672 h. For the compressive strength tests, a cubic specimen (50 mm \(\times\) 50 mm \(\times\) 50 mm) was used, and for the flexural strength tests, a prismatic specimen (25 mm \(\times\) 25 mm \(\times\) 300 mm) was used. The compressive \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Binder Content** & \multicolumn{2}{c}{**Binder Formation (wt. \%)**} & \multicolumn{2}{c}{**Filler**} & **Aggregate** \\ \hline (wt. \%) & Bisphenol A-epoxy resin & Polysulfide liquid polymer & Hardener & (wt. \%) & (wt. \%) \\
28.6 & 13.98 & 9.32 & 5.3 & 21.4 & 50 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Binder formation ratio and mixing ratio of polysulfide polymer concrete. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Size** & **Specific Gravity** & **Unit Weight** & **Absorption** & **Solid Volume** & **Finesse Modulus** & **Water Content** \\ \hline (mm) & (20 \({}^{\circ}\)C) & (kg/m\({}^{3}\)) & (\%) & (\%) & (\%) & (\%) \\
0.35–0.7 & 2.64 & 1670 & 1.56 & 64.9 & 2.65 & \textless{}0.1 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Physical properties of the silica sand. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**SiO\({}_{2}\)** & **Al\({}_{2}\)O\({}_{3}\)** & **Fe\({}_{2}\)O\({}_{3}\)** & **Cao** & **MgO** & **Other** \\ \hline (\%) & (\%) & (\%) & (\%) & (\%) & (\%) \\
83.22 & 10.00 & 2.21 & 0.39 & 0.19 & 3.99 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Chemical composition of the silica powder. and flexural strength tests were conducted according to ASTM C579-01 [31] and ASTM C580-02 [32], respectively. All of the other specimens, regardless of the curing temperature, were tested at a curing time of 168 h (7 days). To assess the displacement conformability of the polysulfide polymer concrete, the load-displacement relationships were measured at the above-mentioned curing temperatures. The displacement tests used the 3-point loading condition, which was the same condition used for the flexural strength tests. The only difference was that in the displacement tests, a linear variable differential transformer, an electromechanical transducer used to measure various types of displacements, was installed at the center of each specimen to measure the displacement of the specimen caused by the applied load. For the strength and displacement tests, a universal testing machine with a maximum load of 300 kN (UT-200, MTDI Inc., Deajeon, Korea) was used. Figures 1 and 2 show images of the setups for the compressive and flexural strength tests, respectively. One of the key factors affecting the performance of polymer concrete is its ability to bond to substrates. In this study, a steel plate with a yield strength of 400 MPa was used as the substrate material. On this steel plate, cylindrical specimens of polymer concrete (50 mm in diameter and 30 mm in height) were placed and cured for 7 days. For the bond strength tests, a pull-off tester (Dyna Z16, Proceq S.A., Schwerzenbach, Switzerland) was employed and the samples were tested according to ASTM C1583 [33].