## 3 Results
### Road Performance Test Analysis  
The comprehensive road performance of the reclaimed asphalt mixtures is listed in Table 5.  
The rutting test was used to evaluate the high-temperature deformation resistance of the asphalt mixtures in reference to the China Technical Standard. The dynamic stability index can be obtained from this test. The greater the dynamic stability, the stronger the high-temperature deformation resistance of an asphalt mixture. As can be seen from Table 5, the dynamic stability of the three asphalt mixtures is in the order of RAP > RAP + PCO > RAP + WPO. This is because the reclaiming agent supplements the aromatic fraction lost in the aging process of the asphalt, the light oil fraction of the asphalt increases while the asphaltene proportion decreases, and the deformation resistance of the asphalt is weakened to a certain extent. The dynamic stability of the waste-palm-oil-based regenerated mixture is about 85% of that of the petrochemical-oil-based regenerated mixture, but it still reaches more than 3000 times/mm, which fully meets the anti-rutting demand of a heavy traffic road surface.  
The low-temperature bending test was used to evaluate the low-temperature cracking resistance of the asphalt mixture. The maximum flexural strain was obtained by the test. The greater the value, the better the low-temperature cracking resistance of the asphalt mixture. At the same time, it was not difficult to find that the low-temperature bending strain of the original pavement did not meet the requirements of the specification. After adding a regenerant, the maximum flexural tensile strain of the asphalt mixture was significantly increased, and the maximum flexural tensile strain of the waste-palm-oil-based regenerated mixture was about 21% higher than that of the petrochemical-oil-based regenerated mixture, which is consistent with the BBR test of the reclaimed asphalt, and again shows that the waste-palm-oil-based regenerator has a prominent advantage in the low-temperature cracking resistance of the aging asphalt.  
\begin{table}
\begin{tabular}{c c c c} \hline
**Stress Level/** & **RAP/** & **RAP + PCO/** & **RAP + WPO/** \\
**MPa** & **10\({}^{-6}\)** & **10\({}^{-6}\)** & **10\({}^{-6}\)** \\ \hline
0.8 & 0.549 & 2.675 & 4.061 \\
1.6 & 0.455 & 2.204 & 2.365 \\
2.4 & 0.344 & 1.770 & 5.535 \\ \hline \end{tabular}
\end{table}
Table 4: Calculation results of creep rate of asphalt mixtures.  
\begin{table}
\begin{tabular}{c c c c c} \hline
**Mixture Type** & **Dynamic Stability/** & **Maximum Flexural Strain/** & **Residual Stability Ratio/** & **Splitting Strength Ratio/** \\  & **(Time/mm)** & **\(\mu\)x** & **\%** & **\%** \\ \hline RAP & 9766 & 2110 & 88.1 & 89.9 \\ RAP + PCO & 8449 & 2774 & 95.7 & 93.3 \\ RAP + WPO & 6895 & 3225 & 96.8 & 92.9 \\ \hline \end{tabular}
\end{table}
Table 5: Recycled asphalt mixture road performance test results.  
The water damage resistance of the asphalt mixtures was evaluated by a freeze-thaw splitting test and an immersion Marshall test. The obtained freeze-thaw splitting strength ratio and residual stability index can quantitatively analyze the water stability of the mixture. The higher the value, the stronger the water damage resistance of the mixture. It can be seen from the table that the water stability test of the asphalt mixtures showed that the residual stability and freeze-thaw splitting strength ratio of the original pavement asphalt mixture were the worst, while the waste-palm-oil-based and petrochemical-oil-based recycled asphalt mixtures were basically the same, and both reached more than 90%. The addition of a regenerant increased the residual stability and freeze-thaw splitting strength of asphalt mixture by about 10%.