## 1 Introduction  
The preparation method of SBS-modified asphalt has a direct effect on its overall performance [1, 2]. Abundant studies have been devoted to the optimization of the preparation method of SBS-modified asphalt. [PERSON] believes that the performance of SBS-modified asphalt is affected by the properties of the base asphalt, the weight average molecular weight of the SBS copolymer, and the applied shear rate [3]. [PERSON] believes that there is a critical shear rate, shear temperature, and shear time to optimize the particle-size distribution and performance of SBS-modified asphalt [4]. [PERSON] conducted the TGA test and concluded that the thermal stability of SBS-modified asphalt can be improved when the shear rate is greater than 3000 rpm; a second small degradation peak appeared at 160 \({}^{\circ}\)C, which shifted to the right with the increase in shear time [5]. [PERSON] performed fluorescence microscopy experiments and concluded that higher shear temperature can improve SBS modifier uniformity and swelling area, and higher shear rate makes the physical dispersion of SBS more uniform, the specific surface area of fine particle size larger, and the area ratio increase due to sufficient swelling effect [6]  
However, most work focusing on this topic is based on conventional performance properties, such as softening point, ductility, and penetration [7, 8]. These indicators are generally empirical and many studies have suggested that they may deviate from actual road performance. A summary of the related literature is shown in Table 1[9, 10, 11, 12, 13]. SBS-modified asphalt is widely used for road construction because of its excellent performance in high-temperature properties and fatigue resistance. Therefore, it appears to be more reasonable and necessary to optimize the preparation method of SBS-modified asphalt based on the corresponding performance of more advanced indicators. High-temperature rutting resistance is one of the key performance indicators of asphalt binder. The multiple stress creep and recovery (MSCR) test proposed by [PERSON] et al. [14,15] is one of the most popular tests for high-temperature performance evaluation. To further investigate the rheological properties based on the MSCR test, the phenomenological model is frequently adopted [16]. The generalized Burgers model is one of the most widely used models. The work of [PERSON] et al. [17,18] reported that the Burgers model could closely approximate the creep and recovery response at any combination of loading and unloading cycles. In terms of the fatigue performance evaluation, the linear amplitude strain (LAS) test is gaining more and more attention these days. The LAS test is a kind of accelerated fatigue test invented by [PERSON] et al. It applies viscoelastic continuum damage mechanics to the analysis and modeling of test results in order to predict the fatigue life of asphalt under any load condition [19, 20, 21, 22]. Furthermore, due to the inherent incompatibility between SBS polymers and plain asphalt, the property of SBS-modified asphalt is also significantly affected by stabilizers. [PERSON] et al. [23] found that SBS-modified asphalt can be improved significantly by reactive blending of SBS and asphalt under high-share mixing at high temperature with elemental sulfur and a vulcanization accelerator. In addition to vulcanization, the production of SBS-modified asphalt usually requires a certain development for better performance; however, long-term development at high temperatures may cause SBS-modified asphalt to age and consequently lead to reduced fatigue life [24,25]. To this end, it is more reasonable and significant to optimize the preparation process of SBS-modified asphalt by using more advanced rheological performance indicators and considering additional influencing factors, such as vulcanization and development. This study aims to investigate the impact of different preparation methods on the performance of SBS-modified asphalt.