# Study on Preparation and Properties of Sintered Brick from Multi-Source Solid Waste
## 2 Materials and Methods
### Preparation Procedures and Design
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**No.** & **A** & **B** & **C** & **Content of** & **Glass Slag Content** & **Content of the Yellow** & **Compressive** \\  & & & **Construction Waste (\%)** & **(\%)** & **River Sand (\%)** & **Strength (MPa)** \\ \hline
1 & 1 & 1 & 1 & 45.0 & 6.0 & 16.0 & 10.6 \\
2 & 1 & 2 & 3 & 45.0 & 8.0 & 12.0 & 8.9 \\
3 & 1 & 3 & 5 & 45.0 & 10.0 & 8.0 & 6.3 \\
4 & 1 & 4 & 2 & 45.0 & 12.0 & 24.0 & 6.8 \\
5 & 1 & 5 & 4 & 45.0 & 14.0 & 20.0 & 8.8 \\
6 & 2 & 1 & 5 & 50.0 & 6.0 & 24.0 & 14.2 \\
7 & 2 & 2 & 2 & 50.0 & 8.0 & 20.0 & 17.1 \\
8 & 2 & 3 & 4 & 50.0 & 10.0 & 16.0 & 24.6 \\
9 & 2 & 4 & 1 & 50.0 & 12.0 & 12.0 & 22.8 \\
10 & 2 & 5 & 3 & 50.0 & 14.0 & 8.0 & 19.7 \\
11 & 3 & 1 & 4 & 55.0 & 6.0 & 12.0 & 17.5 \\
12 & 3 & 2 & 1 & 55.0 & 8.0 & 8.0 & 16.4 \\
13 & 3 & 3 & 3 & 55.0 & 10.0 & 24.0 & 13.9 \\
14 & 3 & 4 & 5 & 55.0 & 12.0 & 20.0 & 16.7 \\
15 & 3 & 5 & 2 & 55.0 & 14.0 & 16.0 & 19.0 \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Orthogonal experimental design and compressive strength test results. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Project** & \multicolumn{3}{c}{**Compressive Strength (MPa)**} \\ \cline{2-4}  & **A** & **B** & **C** \\ \hline Mean value T\({}_{\text{J}}\) & 8.3 & 14.1 & 14.1 \\ Mean value T\({}_{\text{J}}\) & 19.7 & 14.1 & 16.4 \\ Mean value T\({}_{\text{J}}\) & 16.7 & 14.9 & 18.1 \\ Mean value T\({}_{\text{J}}\) & – & 15.4 & 14.2 \\ Mean value T\({}_{\text{J}}\) & – & 15.8 & 11.6 \\ Range value R\({}_{\text{J}}  
(2) For factor B: When the amount of waste glass slag is increased from 6% to 14%, the strength of the sintered brick changes smoothly, the overall trend is gradually increased, and the average value of the sintered brick strength reaches the maximum when the amount of slag is 14%. At this time, glass slag acts as a co-solvent and plays a cementing role between the soil materials, thus improving the strength of the sintered brick. On the basis of the influence of glass slag on the durability of the sintered brick, the dose of glass slag used in this paper is 10%. (3) For factor C: The strength of the sintered brick increases when the doping amount of Yellow River sedimentary sand increases from 8% to 24%. In total, 16% of Yellow River sedimentary sand doping is used in this paper to correct and optimize the particle size distribution. Additionally, when the doping of Yellow River sedimentary sand continues to increase, and the proportion of the clay particles of sintered brick decreases accordingly, which eventually leads to a decrease in the compressive strength of the sintered brick. (4) The order of the range analysis of the influence of each factor on the compressive strength is: the amount of construction waste A > the amount of glass slag doping B > the amount of Yellow River sedimentary sand doping C.  
In order to analyze the significance and difference of the effects of three factors on the data, this paper uses a three-factor ANOVA to further study the relationship between the amount of construction waste, waste glass slag doping, and Yellow River sedimentary sand doping on the compressive strength, and the results are shown in Table 9.  
From Table 9, it can be seen that: the amount of construction waste showed significance (F = 63.468, \(p\) = 0.001 \(<\) 0.05), indicating that the main effect exists, and that the water content will have a differential relationship to the compressive strength. The glass slag substitution rate did not show significance (F = 1.230, \(p\) = 0.423 \(>\) 0.05), indicating that the waste glass slag as a co-solvent with about 10% admixture does not have a significant differential relationship to the compressive strength. The Yellow River sediment sand substitution rate showed significance (F = 7.124, \(p\) = 0.042 \(<\) 0.05), indicating that the main effect exists and that the Yellow River sediment sand substitution rate will have a differential relationship to the compressive strength.