## 3 Results and Discussion  
### Physical Activation Process Test Results  
The particle distribution curves of different specific surface areas are shown in Figures 3-6. The flexural and compressive strengths at different ages of mortar specimens made according to the four specific surface area test programs are shown in Figure 7. The activity index of flexural and compressive strengths is shown in Figure 8. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{3}{*}{**Test Number**} & **Maximum** & \multirow{3}{*}{**Ca**\
\begin{tabular}{} \end{tabular}**} & \multirow{3}{*}{**Coiling Method**} & \multirow{3}{*}{**Test Number**} & \multirow{3}{*}{**Maximum**} & \multirow{3}{*}{**Ca**
\begin{tabular}{} \end{tabular}**} \\  & **Calcination** & & & & **Calcination** \\  & **Temperature** & & & & **Temperature** & **Constant** \\  & \({}^{\prime}\)C & **Temperature** & & & \({}^{\prime}\)C & **Temperature Time** \\  & & & & & & \({}^{\prime}\)C & **min** \\ \hline
2 & 800 & 0 & water quenching & 7 & 1200 & 0 & natural cooling \\
3 & 800 & 0 & natural cooling & 8 & 1200 & 60 & water quenching \\
4 & 1000 & 0 & water quenching & 9 & 1200 & 60 & natural cooling \\
5 & 1000 & 0 & natural cooling & 10 & 1400 & 0 & water quenching \\
6 & 1200 & 0 & water quenching & 11 & 1400 & 0 & natural cooling \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Calication temperature, time, and cooling method of each specimen. Figure 4: Particle grading distribution of volcanic rock powder with a specific surface area of 560 (m\({}^{2}\)/kg). Figure 5: Particle grading distribution of volcanic rock powder with a specific surface area of 640 (m\({}^{2}\)/kg). Figure 3: Particle grading distribution of volcanic rock powder with a specific surface area of 480 (m\({}^{2}\)/kg). Figure 6: Particle grading distribution of volcanic rock powder with a specific surface area of 735 (m\({}^{2}\)/kg). By upgrading the fineness of volcanic rock powder through mechanical grinding, the specific surface area increased from 480 m\({}^{2}\)/kg to 735 m\({}^{2}\)/kg. This was significantly higher than the specific surface area of cement in Xinjiang, which ranged from 300 to 480 m\({}^{2}\)/kg, Class I and Class II fly ash from 400 to 550 m\({}^{2}\)/kg, and S75 and S95 slag micropowder from 350 to 500 m\({}^{2}\)/kg. This enhancement allowed the volcanic rock powder to function as a'microaggregate' in the cementitious system, fulfilling a filling role. The results of the laser particle size analysis are presented in Figures 3-6. As fineness increased, the particle distribution was optimized. The passage rate of particles smaller than 50% decreased from 7.81 um to 5.60 um, and the peak of the frequency distribution also shifted from 12 um to 7 um, indicating an overall trend towards finer particle distribution. Figure 7 shows that the compressive and flexural strengths of the volcanic rock powder showed a continuous increase trend with the increase in its specific surface area. The fineness increased from 480 m\({}^{2}\)/kg to 735 m\({}^{2}\)/kg, and the growth rates of 28-day flexural strength were 9.2%, 14.7%, and 6.1%, respectively. The growth rate of compressive strength was only 1.8%, 2.0%, and 2.2%, respectively, which was relatively slow, and the change rule of other ages was similar. When the fineness was 560 m\({}^{2}\)/kg, the strength growth rate reached the maximum value across all ages. At fineness levels of 640 m\({}^{2}\)/kg and 735 m\({}^{2}\)/kg, the flexural strength of the volcanic rock powder remained basically unchanged after 60 days, while the growth of compressive strength slowed down significantly. As indicated by the strength growth rate, finer fineness does not necessarily lead to a more significant effect on the volcanic rock powder. As shown in Figure 8, with the increase in specific surface area, the 28-day activity index increased from 61% to 65%, and the activity enhancement was only 4%.