# A Study on the Applicability of Waste Glass Wool and Waste Mineral Wool as Fiber Reinforcement
## 2 Materials and Sample Preparation
### Sample Preparations  
In order to evaluate the properties of concrete according to the addition of waste fibers, reference concrete and waste fiber-reinforced concretes were prepared according to the type of waste fiber wool and addition rate, and Table 3 shows the name and mixing ratio of the specimens used in this research. The waste fiber wool with addition rate of 0.5, 1.0, and 2.0% were added based on the weight of the cement, respectively. The design slump and air content for each concrete were determined to be 150 mm and 6%, and the same water/cement ratio of 55% was applied to all mix design. The amount of air entraining agent and water reducer used to satisfy each design value was applied with the addition rate determined from the previous studies.  
The mixing of concrete with added waste fiber wool for specimen preparation was conducted using a forced mixer, following the sequence depicted in Figure 4.  
First, fine aggregate and coarse aggregate were mixed for 30 s, and then, waste fiber wool was added and mixed for 30 s. After that, cement was added and mixed for 30 s, and finally, blending water and additives were added, and mixing was carried out for 2 min. After mixing, properties of fresh concrete mixture were evaluated according to KS F 2402 \"slump test method of concrete\" [24] and KS F 2421 \"air flow test of concrete\" [25], respectively. Then, specimens were created in a circular cylinder of \(100\times 100\times 200\) mm and a prism type of \(100\times 100\times 400\). Specimens were cured in the atmosphere by covering  
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multirow{2}{*}{**Type**} & \multicolumn{8}{c}{**Content (\%)**} \\ \cline{2-8}  & **SiO\({}_{2}\)** & **Al\({}_{2}\)O\({}_{3}\)** & **CaO** & **Fe\({}_{2}\)O\({}_{3}\)** & **MgO** & **MnO** & **Na\({}_{2}\)O** \\ \hline Waste Glass Fiber & 67.3 & 2.33 & 8.76 & 0.52 & 3.25 & 0.01 & 14.9 \\ \hline Waste Mineral Wool & 39.8 & 14.9 & 34.9 & 0.62 & 5.41 & 0.34 & 0.00 \\ \hline \hline \end{tabular}
\end{table}
Table 2: Chemical composition of waste wool fiber.  
Figure 3: Waste fiber wool used in this study.  
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multirow{2}{*}{**Sample No.**} & \multirow{2}{*}{**Fiber Type**} & \multicolumn{8}{c}{**Unit Weight (kg/m\({}^{3}\))**} \\ \cline{3-8}  & & **Fiber** & **Cement** & **Water** & **Sand** & **Coarse** & **AE** & **WR** \\ \hline OPC & - & - & & & & & \\ \hline GW 0.5 & \multirow{2}{*}{\
\begin{tabular}{c} Waste Glass \\ Fiber Wool \\ \end{tabular} } & 1.59 & \multirow{2}{*}{318} & 1.59 & \multirow{2}{*}{783} & \multirow{2}{*}{967} & \multirow{2}{*}{0.032} & \multirow{2}{*}{1.59} \\ GW 1.0 & & 3.18 & & & & & \\ GW 2.0 & & 6.36 & & & & & \\ \hline MW 0.5 & \multirow{2}{*}{
\begin{tabular}{c} Waste \\ Mineral \\ MW 2.0 \\ \end{tabular} } & 1.59 & \multirow{2}{*}{318} & \multirow{2}{*}{175} & \multirow{2}{*}{783} & \multirow{2}{*}{967} & \multirow{2}{*}{0.032} & \multirow{2}{*}{1.59} \\ MW 1.0 & & 3.18 & & & & \\ MW 2.0 & & 6.36 & & & & \\ \hline \hline \end{tabular}
\end{table}
Table 3: Mix design for concrete.  
a tarpaulin to prevent rapid evaporation of moisture in the atmosphere at 20 \({}^{\circ}\)C for 24 h, and after atmospheric curing, the samples were demolded and cured at 20 \(\pm\) 2 \({}^{\circ}\)C in a constant temperature water bath.