## 4 Conclusions  
In this paper, the creep performance at the low temperature of AM, DBFAM, and SBSAM was obtained by the TTEP and the Arrhenius equation in accordance with corresponding moderate temperature creep tests. The relaxation moduli of the three asphalt mixtures at the temperature between \(-\)20 \({}^{\circ}\)C and 50 \({}^{\circ}\)C (at 10 \({}^{\circ}\)C increments) were calculated by the convolution integral and Simpson method according to the corresponding creep compliance data. Subsequently, the effect of modifiers and temperatures on the viscoelastic properties of asphalt mixtures was analyzed by the Burgers model. Moreover, the viscoelastic parameters of the three asphalt mixtures were obtained by the generalized Kelvin model and the generalized Maxwell model. Based on the above results, the following conclusions can be achieved:  
(1) The low-temperature or long-term viscoelastic index of asphalt mixture can be calculated by the high-temperature and short-term viscoelastic index using the TTEP and the Arrhenius equation. The generalized Kelvin model and the generalized Maxwell model are superior to the Burgers model in describing the variation of viscoelastic properties of asphalt mixture with time, but the conclusion is opposite in analyzing the variation with temperature.  
(2) At high temperatures, the asphalt mixture tends to be viscous, its deformation under load is mainly composed of viscous deformation and instantaneous elastic deformation, its relaxation ability to stress is weak, and the relaxation time is longer. At low temperatures, the asphalt mixture tends to  
Figure 7: The trend of the relaxation parameters of the three asphalt mixtures with the test temperatures: (a) \(G_{1}\) and \(G_{2}\); (b) \(p_{1}\) and \(p_{2}\).  
be elastic, and its deformation under load is mainly instantaneous elastic deformation, with strong stress relaxation ability and short stress relaxation time.  
(3) The addition of diatomic and basalt fibers can significantly increase the elastic model E\({}_{1}\) of the asphalt mixture, which greatly reduces the instantaneous elastic deformation of the asphalt mixture; the addition of the SBS modifier increases the viscosity \(\eta_{1}\) of the asphalt mixture, which is significantly improved the ability of the asphalt mixture to resist permanent deformation. In addition, SBS and compound diatomic and basalt fibers can significantly reduce the time of relaxation stress, and enhance the ability of asphalt mixtures to release internal stress, thereby significantly improve the ability of asphalt mixtures to resist temperature cracking.  
(4) This research could provide some references for the engineering application of DBFAM and SBSAM in a variety of climatic conditions, and the viscoelastic parameters obtained by generalized Kelvin and generalized Maxwell can also supply the mechanical performance parameters for simulation calculation of three asphalt mixture under variable temperature conditions using finite element software.  
Conceptualization, Y.C. and L.L.; methodology, L.L., H.L. and Y.Z.; validation, Y.C., Y.B. and H.W.; formal analysis, H.L.; investigation, L.L.; supervision, Y.C.; writing--original draft preparation, L.L.; writing--review and editing, Y.Z., H.W., Y.B. and H.L.; project administration, Y.C.; funding acquisition, Y.C.  
This research was funded by the National Natural Science Foundation of China, grant number (51678271) and the Science Technology Development Program of the Jilin Province, grant number (20160204008 SF); and was supported by Graduate Innovation Fund of the Jilin University grant number (101832018C005).  
We gratefully acknowledge the financial support of the above funds and the researchers of all reports cited in our paper.  
The authors declare no conflict of interest.