## 4 Results and Discussion
### Pavement Structural Materials
#### 4.2.1 Simulation Research  
It can be seen from Table 1 that the cement concrete parameters are larger than asphalt concrete. According to the principle of microwave deicing, it can be qualitatively concluded that the deicing efficiency of cement concrete pavement is higher than that of asphalt concrete. In the simulation model, the initial temperature of the ice layer and the pavement layer is set to \(-10\)\({}^{\circ}\)C, the output \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**Parameters**} & \multicolumn{4}{c}{**2.45 GHz**} & \multicolumn{4}{c}{**5.8 GHz**} \\ \cline{2-7}  & **1** & **2** & **3** & **1** & **2** & **3** \\ \hline Initial temperature/\({}^{\circ}\)C & \(-14.3\) & \(-15.8\) & \(-13.6\) & \(-14.8\) & \(-14.5\) & \(-13.6\) \\ Heating time/S & 423 & 523 & 413 & 105 & 95 & 89 \\ Temperature-rise rate/\({}^{\circ}\)C S\({}^{-1}\) & 0.034 & 0.030 & 0.033 & 0.141 & 0.153 & 0.153 \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Efficiency of asphalt concrete under different microwave frequencies. Figure 9: Comparison of deicing rates between indoor tests and simulations of different frequencies. power of the microwave is 1000 W, the thickness of the ice layer is 10 mm, and when the emission frequency is 2.45 GHz, the emission port distance from the pavement layer is 50 mm to simulate the de-icing process of different road materials. The de-icing simulation of different pavement materials at 2.45 GHz frequency is shown in Figure 10. The temperature change of concrete G points of different pavement materials at 2.45 GHz and 5.8 GHz is shown in Figure 11.  
According to the simulation results, at the frequency of 2.45 GHz, the time for the G point of the cement concrete pavement reaching 0 \({}^{\circ}\)C is 71 s, the temperature rise rate is 0.139 \({}^{\circ}\)C S\({}^{-1}\), and the time for the point, G, of the asphalt concrete pavement reaching 0 \({}^{\circ}\)C is 280 s, the temperature rise rate is 0.036 \({}^{\circ}\)C\({}^{-1}\). The ice-melting efficiency of cement concrete is 3.89 times that of the asphalt concrete. From Table 1, the relative dielectric constant of asphalt concrete is 4.5-6.5, the loss angle constant is 0.015-0.036, and the relative dielectric constant is 8, and the loss angle constant is 0.048. By formula (1)'s calculation, it can be concluded that cement concrete has a stronger ability to absorb  
Figure 11: Temperature change chart of concrete G points of different pavement materials at 2.45 GHz frequency. Figure 10: Deicing simulation of different pavement materials at 2.45 GHz frequency. microwave heat than asphalt concrete, so under the action of microwave, cement concrete has a higher melting ice efficiency. It can be seen from Figure 12. that at the frequency of 5.8 GHz, the time for the point, G, to reach 0 \({}^{\circ}\)C at the center point of the cement concrete pavement is 13 s, the temperature rise rate is 0.77 \({}^{\circ}\)C S\({}^{-1}\), and the time for the point, G, to reach 0 \({}^{\circ}\)C at the center point of the asphalt concrete pavement is 65 s, the temperature rise rate is 0.15 \({}^{\circ}\)C\({}^{-1}\), which shows that the ice-melting efficiency of cement concrete is 5.23 times that of asphalt concrete. From Table 1, the relative dielectric constant of asphalt concrete is 4.5-6.5, the loss angle constant is 0.015-0.036, and the relative dielectric constant is 8, and the loss angle constant is 0.048. At 5.8 GHz microwave frequency, f is higher than 2.45 GHz. By formula (1), it can be concluded that cement concrete has a stronger ability to absorb microwave heat than asphalt concrete. The higher the frequency is, the more obvious the gap is. Therefore, under the effect of strong microwaves, the cement concrete ice melting efficiency is higher. Microwaved ice is a very complicated process, and there are many factors that affect the deicing of microwaves, and they are complicated and cross-influenced.