# Evaluation of Aging Resistance of Graphene Oxide Modified Asphalt
## 4 Conclusions  
The I\({}_{\text{C=O}}\) and I\({}_{\text{S=O}}\) before and after UV aging were tested by the FTIR to study the chemical structure changes of the GO-modified asphalt during UV aging. The PRR, SPI, DRR, and the VAI were calculated and analyzed to estimate the physical properties changes of the GO-modified asphalt during UV aging. Finally, the DSR was used to study the rheological properties, G* and 8, before and after aging. After analyzing the results of these tests, the following conclusions can be made:  
1. Before aging, the GO could decrease the G* and slightly change the \(\delta\) of 90 A and SBS MA; in total, a smaller G*sin\(\delta\) value was obtained after being modified by the GO, which shows that the GO could improve the fatigue cracking resistance performance of the 90 A and SBS MA binders.
2. According to the rheological property testing, before and after TFOT, the GO could improve the thermo-oxidative aging resistance performance of 90 A and SBS MA, and the improvement effect of the GO on 90 A was better than SBS MA.
3. After UV aging, the I\({}_{\text{C=O}}\) and I\({}_{\text{S=O}}\) increment of the GO modified asphalt were smaller than that of the asphalt without GO. The GO could retard the formations of the carbonyl and sulfoxide groups during UV aging, and decrease the aging degree of 90 A and SBS MA.
4. After UV aging, the GO could increase the PRR and DRR of 90 A and SBS MA, meanwhile decreasing the SPI and VAI; the order of the G* was 3% GO-modified asphalt < 1% GO-modified  
Figure 14: Fatigue cracking factor of SBS MA and GO-modified SBS MA.  
\begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline
**Aging Degree** & \multicolumn{3}{c}{**Virgin**} & \multicolumn{3}{c}{**TFOT Aging**} & \multicolumn{3}{c}{**UV Aging**} \\ \hline GO content (\%) & 0 & 1 & 3 & 0 & 1 & 3 & 0 & 1 & 3 \\ FFT (\({}^{\circ}\)C) & 16.8 & 16.6 & 15.8 & 19.3 & 19.8 & 19.1 & 21.4 & 20.6 & 20.1 \\ \hline \hline \end{tabular}
\end{table}
Table 3: The FFT of the SBS MA and GO-modified SBS MA.  
asphalt! 90 A (or SBS MA). The increment of G* was obviously decreased after adding the GO, and the fatigue cracking resistance performance of GO-modified asphalt were better than that of the asphalt without the GO. The results showed that the GO could improve the stability of the asphalt physical performance. The GO could improve the UV aging resistance performance of 90 A and SBS MA obviously, and the improvement effect of the 3% GO was better than that of 1% GO.  
The authors acknowledge the financial supported by the National Basic Research Program of China (973 program no. 2014 CB932104), and the National Key Scientific Apparatus Development Program from the Ministry of Science and Technology of China (no. 2013 YQ160501).  
[PERSON], [PERSON], and [PERSON] conceived and designed the experiments. [PERSON], [PERSON], and [PERSON] performed the experiments. [PERSON], [PERSON], [PERSON], and [PERSON] analyzed the data. [PERSON] and [PERSON] contributed reagents/materials/analysis tools. [PERSON], [PERSON], [PERSON], and [PERSON] wrote the paper. [PERSON] and [PERSON] designed the software used in analysis. [PERSON] reviewed the paper.  
The authors declare no conflict of interest.