## 4 Conclusions and Recommendations  
Prior research showed that the epoxy value has an obvious and regular effect on the performance of WER-EA, and, compared with other curing agents, WER-EA using the curing agent TETA has better comprehensive performance. In this continuous study, the AC-13 graded mixture was prepared using E20-T, E44-T, and E51-T, and the high- and low-temperature and water stability properties of the mixtures were analyzed with an EA mixture as the control group. The main conclusions were as follows:  
1. In the mix design, the water consumption of the selected additive was 3-3.5%, and the optimal emulsion dosage of the four mixtures was 9%. It was verified that the volume indexes of the Marshall specimens of the EA, E20-T, E44-T, and E51-T mixtures prepared according to the gradation in this paper met the requirements of the specification. 2. The three WER systems can significantly improve the high-temperature performance and water stability of emulsified asphalt mixtures. This is because after the WER system is cured, a dense three-dimensional skeleton structure is generated in the mixture, which can tightly wrap the asphalt so that its fluidity will not change too much even at a high temperature or in the presence of water pressure, thus forming a high-performance whole with the mixture. 3. In terms of high-temperature performance, the E20-T mixture was better than the other two WER-EA mixtures, showing the highest \(MS\) value, \(T\) value, and \(DS\) value, and the smallest \(FL\) value and \(RD\) value. This is consistent with the conclusions of the asphalt performance analysis, which indicated that WER with a low epoxy value is more conducive to improving the high-temperature deformation resistance of WER-EA mixtures. 4. In terms of low-temperature performance, the \(R_{T}\) value and \(\varepsilon_{T}\) value of the E44-T mixture were larger than those of the other mixtures, while its \(S_{T}\) value was the smallest. The performance of the E20-T mixture was opposite to that of the E44-T mixture, that is, E44 had the least negative impact on the low-temperature performance of the WER-EA mixture, while E20 caused the greatest weakening of the low-temperature crack resistance of the WER-EA mixture. This indicates that WER with a medium epoxy value can reduce the low-temperature performance of WER-EA mixtures. 5. The \(TSR\) value and \(IRS\) value of the E20-T mixture were higher, that is, the comprehensive effect of E20-T on improving the water damage resistance of the emulsified asphalt mixture was better. This is because the use of WER with a low epoxy value is more conducive to the formation of a more stable and cross-linked interpenetrating polymer network in a WER-EA mixture. In summary, while our results indicate that the mixture with an epoxy value of 20 and the curing agent TETA exhibited the best overall performance in terms of high-temperature deformation and water damage resistance, there is a clear need for further research to enhance the low-temperature crack resistance of WER-EA mixtures. Future studies should focus on exploring alternative curing agents or modifying the epoxy formulation to improve the flexibility and resilience of WER-EA mixtures at low temperatures. Furthermore, investigating the microstructural characteristics of these mixtures under varying temperature conditions could provide valuable insights into optimizing their composition for better low-temperature performance. Additionally, we also recommend implementing field trials to observe the real-world performance of modified WER-EA mixtures in low-temperature environments, coupled with long-term durability studies. Conceptualization, W.L. and K.Y. ; methodology, W.L. and K.Y. ; validation, L.W., M.W. and Z.Z. ; formal analysis, L.W. ; investigation, L.W. and J.S. ; resources, K.Y. ; writing--original draft preparation, L.W., J.S. and W.L. ; writing--review and editing, Z.Z. and W.L. ; visualization, J.S. and Z.Z. ; supervision, K.Y. ; funding acquisition, K.Y.