**7. Plausible solid-state mechanism for advanced geopolymerization**

The solid-state mechanism involved in advanced geopolymerization reaction is different from that of conventional geopolymerization in the initial steps [33]. So the plausible chemical reaction mechanism for advanced geopolymerization can be understood under the following points:


$$\begin{array}{c} \text{\tiny\text{\tiny\text{\tiny\text{\tiny}}}} \\ \text{\tiny\text{\tiny\text{\tiny}}} \end{array} \tiny{\text{\tiny\text{\tiny}}} \begin{array}{c} \blacksquare \blacksquare \blacksquare \blacksquare \blacksquare \end{array} \begin{array}{c} \blacksquare \blacksquare \blacksquare \end{array} \xrightarrow{\begin{array}{c} \blacksquare \blacksquare \blacksquare \end{array}} \begin{array}{c} \text{\tiny\text{\tiny$$

**Figure 5.**

*Illustration of formation of silanone and silanols for advanced geopolymerization via SN1 solid-state chemistry mechanism [33].*
