## 4 Conclusions  
In this paper, a new type of shape-memory hydrogenated epoxy resin (SM-HEP) was prepared from hydrogenated bisphenol A epoxy resin (AL-3040), polypropylene glycol diglycidyl ether (JH-230), and isophorone diamine (IPDA). The preparation of SM-HEP used for asphalt mixture (SM-HEP-AM) showed that the fitted glass-transition temperature (\(T_{\text{g}}\)) and measured \(T_{\text{g}}\) are almost the same. It was concluded that the needed \(T_{\text{g}}\) of the SM-HEP specimen can be accurately obtained by the preparation method. Furthermore, when IPDA has a fixed content of 0.5 mol, we can predict the \(T_{\text{g}}\) when JH-230 has a content ranging from 0.0796 to 0.0353, and the required \(T_{\text{g}}\) ranges from 40 to 60 \({}^{\circ}\)C. The DSC results demonstrated that the SM-HEP-AM \(T_{\text{g}}\) decreased with the increased JH-230 content. This may be explained by the increase in the JH-230 content decreasing the cross-link density, thus resulting in an increased segment mobility. The storage modulus of the SM-HEP-AM changed almost three orders magnitude below and above the \(T_{\text{g}}\), which means that the SM-HEP-AM is a good kind of SMP. Meanwhile, when the chain segment mobility increased, the glass modulus increased as the JH-230 content decreased. The changes in the relationship between the JH-230 content and \(T_{\text{g}}\) in the loss modulus versus temperature curve tested by DMA is consistent with the DSC results. As for the SM-HEP-AM with the same formulation, the \(T_{\text{g}}\) measured by DSC and that obtained by DMA were almost uniform. The SM-HEP-AM revealed a good shape-memory performance, and the full recovery can be observed after only several minutes at \(T_{\text{g}}\) + 10 and \(T_{\text{g}}\) + 20 \({}^{\circ}\)C. The SM-HEP-AM specimens require less time to complete the shape recovery process at higher temperatures than at lower temperatures. On account of the influence of the crosslink density, the shape recovery time decreased with the decreased JH-230 content. The deformation recovery performance of the asphalt mixture mixed with the SM-HEP-AM was better than that of the matrix asphalt mixture. This may provide a method to slow down the accumulation of plastic deformation.  
The writers wish to acknowledge the financial support of this research by the \"Twelfth five-year\" National Science and Technology Support Plan (No. 2014 BAG05B04), the Construction Science and Technology Project of Ministry of Transport of China (No. 2013318490010), and the Central University program (No. 310821175012).  
Figure 14: The deformation recovery ratio of the asphalt mixture and asphalt mixture mixed with the SM-HEP-AM.  
**Author Contributions:** [PERSON] built the overall framework. [PERSON] built the trial protocol, carried out the experiments, analyzed the experimental data, and studied the results. [PERSON] discussed the test results. [PERSON] carried out the experiments. [PERSON] professionally revised the whole paper and the corresponding grammar, spelling mistakes, and vague descriptions. All authors discussed and contributed to the manuscript.  
**Conflicts of Interest:** The authors declare no conflict of interest.