## 4 Results and Discussion
### Performance of Polymer Curing Agent
#### 4.1.2 Bonding Performance  
Test results of bonding strength at 7 d and 28 d are shown in Figure 8.  
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Test Section** & **Rock** & **Geological Characteristics** & \begin{tabular}{c} **Treatment** \\ **Location** \\ \end{tabular} & \begin{tabular}{c} **Protection Plan** \\ \end{tabular} \\ \hline \multirow{7}{*}{Zhejiang test slope} & Highly weathered & \begin{tabular}{c} It is light gray, grayish yellow, weak, \\ broken, and gravel-like with a \\ fragmented core; its joint fissures are \\ filled with mud and are very \\ developed, irregular, and open; it has \\ a rough surface and a large amount of \\ iron and manganese. \\ \end{tabular} & \begin{tabular}{c} It is protected by \\ polymer curing agent, \\ system anchor, \\ water-absorbing \\ polymer materials, and \\ external-soil \\ spray-seeding technique. \\ \end{tabular} \\ \hline \multirow{7}{*}{Human test slope} & \
\begin{tabular}{c} It has a sand–mud structure with \\ micro-expansion property; \\ it has a large amount of mica and \\ vertically developed joint fissures; it \\ has serious differential \\ weathering (spherical weathering, \\ sac-like weathering, etc.); \\ its liquid limit index is too large; \\ it has low strength, poor stability, and \\ low damage-resistance. \\ \end{tabular} &
\begin{tabular}{c} It is protected by \\ polymer curing agent, \\ system anchor, \\ water-absorbing \\ slopes \\ external-soil \\ spray-seeding technique. \\ \end{tabular} \\ \hline \hline \end{tabular}
\end{table}
Table 6: Protection design of the test slope.  
Figure 7: Relationship between polymer–cement ratio and viscosity.  
Through the analysis of test results in Figure 8, the bonding strength of the polymer curing agent does not increase as the polymer-cement ratio increases. As the polymer-cement ratio increases, the bonding strength of polymer curing agent increases first and then decreases. When the polymer-cement ratio is 1, the bonding strength of the polymer curing agent reaches the maximum. Because the chemical reaction between the polymer organic groups in the polymer emulsion, solid calcium hydroxide, and silicate on the surface of the cement hydration products is the most complete, the bonding ability of the cement hydration products is improved. When the polymer-cement ratio is greater than 1, it continues to increase so that the relative content of cement decreases. At this time, the bonding strength is mainly generated by the polymer emulsion. When the polymer-cement ratio is smaller than 1, the bonding strength of the layer begins to decrease. The main reason is that with the decrease of the polymer-cement ratio and the increase of the cement, the cement gradually replaces the latex and its hydration products play a leading role. The bonding strength at 28 d is much larger than that at 7 d because the hydration and polymerization of the cement in the emulsion is more complete with the extension of the reaction time. The bonding strength is mainly generated by the gelation of cement and polymer polymerization, latex in the emulsion, and hydration products of cement, etc.