# Determining the Compaction Temperature of Warm-Mix Anti-Rutting Asphal Mixture
## 4 Compaction Characterization of Warm-Mix Anti-Rutting Asphal Mixture
### Comparison of Results  
By comparison, it was found that there is a certain difference between the compaction temperature determined by the saturated surface-dry method and that obtained by CT industrial scanning of the specimens, this shows the difference between measured and calculated voids for warm-mix anti-rutting asphalt mixture. The compaction temperatures determined by the viscosity-temperature curve method, the saturated surface-dry method for measuring voids, and the CT scanning for calculating voids are summarized in Table 9. The anti-rutting agent content in all cases is 6%. As can be seen from Table 9, when the warm-mix-agent content is 0%, the compaction temperatures determined by different methods are essentially consistent. As the content of Sasobit warm-mix agent increases, there are significant differences in the compaction temperatures determined by different methods. When the warm-mix-agent content is 1%, the compaction temperatures obtained by the saturated surface-dry method and the CT scanning method are reduced by 13.5% and 12.1%, compared to the viscosity-temperature curve method; when the warm-mix-agent content is 2%, the compaction temperatures obtained by the saturated surface-dry method and the CT scanning method are reduced by 17.2% and 14.2%, compared to the viscosity-temperature curve method; and when the warm-mix-agent content is 3%, the compaction temperatures obtained by the saturated surface-dry method and the CT scanning method are reduced by 19.8% and 14.7%, compared to the viscosity-temperature curve method. It can be seen that the compaction temperatures determined by the asphalt-mixture equal voids method are significantly lower than those obtained by the viscosity-temperature curve method. Based on the compaction temperature determined by the equal voids method from the continuous compaction test, the rutting test, uniaxial penetration test, and Marshall immersion test for the warm-mix anti-rutting asphalt mixture were conducted; the test results are shown in Table 10.  
The above road performance test results comply with the requirements of the specification JTG F40-2004. It is indicated that the compaction temperature for the warm-mix anti-rutting-modified asphalt mixture determined by the voids-compaction temperature curve complies with the actual construction requirements. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Sasobit Warm-Mix** & **Dynamic Stability** & **Shear Strength** & **Residual Stability of** \\
**Agent** & **(times/mm)** & **(MPa)** & **Specimens in Water (\%)** \\ \hline
0\% & 9405 & 3.536 & 93.57 \\
1\% & 9750 & 3.808 & 94.77 \\
2\% & 9962 & 4.301 & 96.31 \\
3\% & 10273 & 4.566 & 96.16 \\ \hline \hline \end{tabular}
\end{table} 
Table 10: Road performance test results. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Sasobit Warm-Mix** & **Viscosity** & **Saturated** & **Industrial CT** \\
**Agent** & **Temperature Curve** & **Surface-Dry** & **Industrial CT** \\ \hline
0\% & 180.88 & 173.23 & 176.32 \\
1\% & 168.96 & 146.16 & 148.51 \\
2\% & 168.18 & 139.28 & 144.30 \\
3\% & 166.92 & 133.84 & 142.39 \\ \hline \hline \end{tabular}
\end{table} 
Table 9: Compaction temperature (°C) of warm-mix anti-rutting asphalt mixture determined using different methods. Using the viscosity-temperature curve method for asphalt materials cannot accurately reflect the effect of warm-mix agent on the compaction characteristics of anti-rutting asphalt mixture. This is because warm-mix anti-rutting asphalt is more complex compared to base asphalt. Base asphalt has a single composition, stable properties, and its viscosity changes consistently with temperature.