## 2 Experimental Details
### Methods
#### 2.2.1 OMGPC Mix Design
\begin{table}
\begin{tabular}{c c c} \hline \hline
**Factor Number** & **MK:GGCS (A)** & **SS:SH:CH (B)** & \(f_{\text{c}}\) **(7-d)** \\ \hline REF1 & 30:70 & 30:40:30 & 16.33 \\ REF2 & 30:70 & 40:40:20 & 26.34 \\ REF3 & 30:70 & 50:30:20 & 25.60 \\ REF4 & 40:60 & 30:40:30 & 9.94 \\ REF5 & 40:60 & 40:40:20 & 20.04 \\ REF6 & 40:60 & 50:30:20 & 19.87 \\ REF7 & 05:50 & 30:40:30 & 4.80 \\ REF8 & 50:50 & 40:40:20 & 10.21 \\ REF9 & 50:50 & 50:30:20 & 9.93 \\ K\({}_{1}\) & 22.76 & 10.36 \\ K\({}_{2}\) & 16.62 & 18.86 \\ K\({}_{3}\) & 8.31 & 18.47 \\ R & 14.45 & 0.39 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Results and range analysis data of L\({}_{3}\)(3\({}^{2}\)) orthogonal matrix test. \begin{table}
\begin{tabular}{c c c c c c c c c c c c c} \hline \hline \multirow{3}{*}{**ID**} & \multirow{3}{*}{ \begin{tabular}{c} **MS** \\ **(kg/m\({}^{3}\))** \\ \end{tabular}  } & \multirow{3}{*}{ \begin{tabular}{c} **CA** \\ **(kg/m\({}^{3}\))** \\ \end{tabular}  } & \multirow{3}{*}{ \begin{tabular}{c} **Density** \\ **(kg/m\({}^{3}\))** \\ \end{tabular}  } & \multirow{3}{*}{ \begin{tabular}{c} **\(f_{\text{c}}\)(MPa)** \\ **(\%)** \\ \end{tabular}  } & \multirow{3}{*}{ \begin{tabular}{c} **Na\({}_{2}\)O** \\ **(\%)** \\ \end{tabular}  } & \multirow{3}{*}{ \begin{tabular}{c} **CaO** \\ **(\%)** \\ \end{tabular}  } & \multirow{3}{*}{ \begin{tabular}{c} **Si/** \\ **Al** \\ \end{tabular}  } & \multirow{3}{*}{ \begin{tabular}{c} **Na/** \\ **Al** \\ \end{tabular}  } & \multirow{3}{*}{ \begin{tabular}{c} **(Ca + Mg)O** \\ **\end{tabular}  } & \multirow{3}{*}{\ \begin{tabular}{c} **Ca/** \\ **Al** \\ \end{tabular}  } & \multirow{3}{*}{ \begin{tabular}{c} **Na/** \\ **Al** \\ \end{tabular}  } \\ \cline{1-1}  & 778 & 1167 & 2360 & 16.33 & 5.28 & 29.02 & 4.38 & 0.12 & 0.54 & 1.06 & 3.29 & 0.16 \\ REF2 & 778 & 1167 & 2332 & 26.34 & 5.60 & 28.18 & 4.41 & 0.13 & 0.57 & 1.03 & 3.20 & 0.18 \\ REF3 & 778 & 1167 & 2338 & 25.60 & 5.03 & 28.18 & 4.45 & 0.12 & 0.52 & 1.02 & 3.20 & 0.16 \\ REF4 & 778 & 1167 & 2312 & 9.94 & 5.30 & 25.63 & 4.50 & 0.11 & 0.51 respectively. Therefore, the most effective mix design was REF3, which was then used as the control mix for the main study, while other mixes contained RESIN8 and FWG aggregates, respectively, as presented in Table 7.  
Mix Proportion and Procedure  
Table 7 presents the mix proportion of the OMGPC. The MS was substituted with RESIN8 at 5% and 10% by volume of the sand (hereafter referred to as R5% and R10%). In addition, a second batch of the OMGPC was produced with the substitution of MS with FWG at 5% and 10%, hereafter referred to as G5% and G10%. Figure 4 depicts the production chart of the OMGPC, with its mixing process similar to conventional concrete. The OMGPC was mixed in a 50-litre mechanical mixer at a 60 rev/min frequency. The components were dry mixed for 3 min before introducing 60% of the required water, then mixed for another 3 min, and the remaining 40% water mixed with SP was introduced to the mixture. The mixture was further mixed for another 3 min, and the fresh properties of the mixtures were measured. The mixture was then cast into various mould sizes according to the test requirements. The OMGPC matrices were cured in ambient conditions for 7, 28, and 90 days (hereafter referred to as 7-d, 28-d, and 90-d) before various strength properties were investigated, as depicted in Figure 5.  
Figure 5: OMGPC programme chart.