## 3 Results  
### Workability by Type of Foaming Agent  
#### 3.1.1 Mixing Test to Derive the Optimum Mix Proportion  
The results of the flowability evaluation according to the changes in the amounts of foaming agent and lightweight aggregate, and the changes in the fiber contents, are shown in Figures 4 and 5, respectively. The results of the workability test of foamed concrete using a synthetic foaming agent \begin{table}
\begin{tabular}{c c c c c c c c c c c c} \hline \hline \multirow{2}{*}{**No.**} & \multirow{2}{*}{**Specimen**} & \multirow{2}{*}{\begin{tabular}{c} **W/C** \\ **(\%)** \\ \end{tabular} } & \multicolumn{4}{c}{**Unit Weight (kg/m\({}^{3}\))**} & \multicolumn{2}{c}{**Foam (L/m\({}^{3}\))**} & \multirow{2}{*}{\
\begin{tabular}{c} **Fiber** \\ **Volume** \\ **(kg/m\({}^{3}\))** \\ \end{tabular} } & \multirow{2}{*}{
\begin{tabular}{c} **Super** \\ **Plasticizer** \\ **(kg/m\({}^{3}\))** \\ \end{tabular} } \\ \cline{5-10}  & & & & **Water** & **Binder** & **Cement** & **Fly Ash** & **ALA** & **SFA** & **AFA** & **(\%)** & **(kg/m\({}^{3}\))** \\ \hline  
& & & & & & & 0.3 & & \\ \hline
27 & FALWA25 & & & & & & & & & 0 & \\
28 & FALWA25 (0.1\%) & & & & & & & & 0.1 & & \\
29 & FALWA25 (0.2\%) & & & & & & & & 0.2 & & \\
30 & FALWA25 (0.3\%) & & & & & & & & 0.3 & & 0.76 \\ \hline
31 & FALWA50 & & & & & & & & & 0 & & \\
32 & FALWA50 (0.1\%) & & & & & & & & 0.1 & & \\
33 & FALWA50 (0.2\%) & & & & & & & & 0.2 & & \\
34 & FALWA50 (0.3\%) & & & & & & & & & 0.3 & \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Mix design. ALA: autoclaved lightweight concrete aggregate; SFA: synthetic foaming agent; AFA: animality foaming agent. and an animal-protein-based foaming agent confirmed that the flow decreased as the input amount of foam increased. This suggests that the increase in the fine foam particles led to the decrease of the flowability in the concrete [17]. In addition, it was confirmed that this flow reduction was mitigated by the increase of the water-cement ratio. The specimen using an animal-protein-based foaming agent underwent foam destruction in the slurry (defoaming phenomenon) after mixing. In addition, the phenomenon of flow reduction due to an increase in the input amount of foam was not clearly identified. As a result of the flowability test, it was confirmed that the foam particles were relatively well distributed and maintained in the foamed concrete using the synthetic foaming agent, and thus, the synthetic foaming agent was found to be suitable for the purposes of workability improvement and lightweight realization for light transparent concrete. In addition, an approximate 215-230 mm flow was confirmed in the 45% water-cement ratio, which was determined to be the appropriate flowability range considering that lightweight aggregate and fibers are to be mixed in the future. It was found that the water-cement ratio suitable for this study was 45%, and the proper input ratio of foam was determined to be 50-60% of the total volume [18; 19; 20]. Figure 4: Flow test results according to foaming agents and water-cement ratios. Figure 5: Flow test results according to lightweight aggregates and fiber mixing ratios. The results of the workability test according to the changes in the lightweight aggregate ratio and the fiber content are shown in Figure 5. In the specimen without fly ash, the flowability decreased due to the increase of the consistency with an increase in the fiber content. The specimen using the 350 kg/m\({}^{3}\) lightweight aggregate showed flowability reduction, unlike in the specimen using the 175 kg/m\({}^{3}\) lightweight aggregate. In the case of the specimen in which fly ash 25% of the cement volume was added, the increase of the viscosity occurred at the more than 0.1% fiber content and it was confirmed that the fiber content and the flow were inversely proportional to each other. The results of the workability test using the foaming agent showed that the flow decreased as the foam input amount increased, and the increase in the water-cement ratio led to increased flow.