## 3 Results and Discussion
### Indirect Tensile Strength  
Tensile strength is one of the important features, as concrete is highly vulnerable to cracking. A standard test cylinder is placed horizontally between the loading plates of the compression machine and failure of the cylinder along vertical diameter is observed. Three samples for each ratio (six ratios) and for each material (three materials) were developed and tested. Temperature variation was from room Temperature (27 \({}^{\circ}\)C) to 400 \({}^{\circ}\)C. Samples were also tested beyond that limit at 500 \({}^{\circ}\)C but they were unable to be tested for tensile strength because of spalling.  
With the change of percentage, the behavior of marble powder (MP) was found best compared to its other two competitors (i.e., S.F and GGBFS). Furthermore, comparative analysis shows that strength of concrete can be explored with all three additives depending on their availability and economics because there is very little difference in highest strength values, as shown in Table 5.  
Comparative analysis with the previous studies shows that trend remains almost same with the change of additive percentage (as shown in Figure 4). Most studies have shown up to 20% higher strength than control samples.  
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline  & \multicolumn{2}{c}{**Material Replaced**} & \multicolumn{5}{c}{**Silica Fume (S.F)**} \\ \cline{2-9}
**Days** & **Temp (\({}^{\circ}\)C)** & **0\%** & **5\%** & **10\%** & **15\%** & **20\%** & **25\%** \\ \hline
7 & 27 \({}^{\circ}\)C (R.T.) & 0.41 & 0.67 & 0.97 & 1.01 & 1.08 & 1.14 \\
14 & 27 \({}^{\circ}\)C (R.T.) & 0.71 & 1.01 & 1.06 & 1.19 & 1.28 & 1.61 \\
28 & 27 \({}^{\circ}\)C (R.T.) & 1.02 & 1.52 & 1.96 & 2.02 & 2.07 & 2.01 \\
28 & 100 \({}^{\circ}\)C & 0.81 & 0.98 & 1.08 & 1.21 & 1.67 & 1.93 \\
28 & 200 \({}^{\circ}\)C & 1.09 & 1.17 & 1.32 & 1.41 & 1.79 & 2.07 \\
28 & 300 \({}^{\circ}\)C & 1.16 & 1.24 & 1.51 & 1.57 & 2.06 & 2.49 \\
28 & 400 \({}^{\circ}\)C & 1.43 & 1.97 & 2.02 & 2.68 & 2.97 & 3.01 \\ \hline \multicolumn{9}{c}{**Material Replaced**} & \multicolumn{5}{c}{**Ground Granulated Blast Furnace Slag (GGBFS)**} \\ \cline{2-9}
**Days** & **Temp (\({}^{\circ}\)C)** & **0\%** & **5\%** & **10\%** & **15\%** & **20\%** & **25\%** \\ \hline
7 & 27 \({}^{\circ}\)C (R.T.) & 0.41 & 0.53 & 0.75 & 0.81 & 0.94 & 1.07 \\
14 & 27 \({}^{\circ}\)C (R.T.) & 0.71 & 0.98 & 1.13 & 1.17 & 1.43 & 1.61 \\
28 & 27 \({}^{\circ}\)C (R.T.) & 1.02 & 1.08 & 1.68 & 1.81 & 1.91 & 2.03 \\
28 & 100 \({}^{\circ}\)C & 0.81 & 1.84 & 2.07 & 2.10 & 2.29 & 2.37 \\
28 & 200 \({}^{\circ}\)C & 1.09 & 1.97 & 2.41 & 2.59 & 2.71 & 2.89 \\
28 & 300 \({}^{\circ}\)C & 1.16 & 2.09 & 2.54 & 2.78 & 2.81 & 2.90 \\
28 & 400 \({}^{\circ}\)C & 1.43 & 2.47 & 2.88 & 2.97 & 3.01 & 3.07 \\ \hline \multicolumn{9}{c}{**Material Replaced**} & \multicolumn{5}{c}{**Marble Powder (MP)**} \\ \cline{2-9}
**Days** & **Temp (\({}^{\circ}\)C)** & **0\%** & **5\%** & **10\%** & **15\%** & **20\%** & **25\%** \\ \hline
7 & 27 \({}^{\circ}\)C (R.T.) & 0.41 & 0.71 & 0.88 & 0.91 & 0.97 & 1.09 \\
14 & 27 \({}^{\circ}\)C (R.T.) & 0.71 & 0.99 & 1.16 & 1.21 & 1.62 & 1.76 \\
28 & 27 \({}^{\circ}\)C (R.T.) & 1.02 & 1.12 & 1.19 & 1.76 & 1.83 & 1.92 \\
28 & 100 \({}^{\circ}\)C & 0.81 & 1.89 & 1.90 & 1.99 & 2.09 & 2.10 \\
28 & 200 \({}^{\circ}\)C & 1.09 & 2.00 & 2.06 & 2.13 & 2.27 & 2.37 \\
28 & 300 \({}^{\circ}\)C & 1.16 & 2.71 & 2.79 & 2.81 & 2.97 & 2.87 \\
28 & 400 \({}^{\circ}\)C & 1.43 & 2.90 & 2.97 & 3.01 & 3.04 & 3.09 \\ \hline \hline \end{tabular}
\end{table}
Table 5: Test results for hardened self-compacted concrete (tensile strength, MPa).