橡胶沥青贮存稳定性差、施工烟气大，严重影响其进一步推广使用；SBS改性沥青应用广泛，但存在易老化及造价高等限制。为解决此难点痛点问题，本文综合胶粉脱硫以及胶粉/SBS复合等举措，以脱硫胶粉和SBS作为沥青改性剂材料，进行脱硫胶粉/SBS复合改性沥青及其混合料性能研究工作，主要内容如下：

（1）结合针入度、延度、软化点及黏度等指标，研究了脱硫胶粉/SBS复合改性沥青制备工艺及掺配比例，确定了复合改性沥青最佳掺配比：25%脱硫胶粉+2%SBS，最佳制备工艺：先加入SBS剪切后加入脱硫胶粉，制备温度175℃，剪切时间为50min。并对复合改性沥青基本性能、黏温特性、抗老化性能、贮存稳定性、流变性能及烟气排放进行对比研究，结果表明其具备优异的黏温特性、抗老化耐久性及流变性能，贮存稳定性得到进一步提升，SO₂释放量较SBS改性沥青降低25%左右，NO₂、NO_X释放量降低超50%。

（2）对比分析复合改性沥青官能团变化和微观形态，结合胶粉表面形态，阐明其改性机理。复合改性沥青中脱硫胶粉与SBS改性剂均匀分散并相互交联，脱硫胶粉-SBS-沥青三相间界面模糊，发生溶胶-凝胶的变化，存在化学键变化与接枝反应，形成更为稳定的三维网状结构，其改性过程为物理共混与化学反应共存的相容稳定改性。

（3）验证了复合改性沥青AC-13和SMA-13混合料路用性能。结果表明复合改性沥青满足现行规范要求，具有优异高温抗车辙性，且在间断级配中更为显著，低温抗裂性略低于SBS改性沥青，水稳定性与SBS改性沥青相当，均达到90%以上。

Rubber asphalt has poor storage stability and large construction smoke, which seriously affects its further promotion and use; SBS modified asphalt is widely used, but it has limitations such as easy aging and high cost. In order to solve this difficult and painful problem, combined with rubber powder desulfurization and rubber powder/SBS compounding measures, desulfurized rubber powder and SBS were adopted for the purpose of asphalt modification, and the performance of desulfurized rubber powder/SBS composite modified asphalt and its mixture was tested and analyzed. The main research contents were as follows:

(1) Combining penetration, ductility, softening point, and viscosity other indicators, these tests were combined to determine the preparation parameters of the desulfurized rubber powder/SBS composite modified asphalt as follows: desulfurized rubber crumb content of 25%, SBS content of 2%, the method of adding SBS for shearing and then adding desulfurized rubber powder, preparation temperature of 175℃, and shear time of about 50min. The basic performance, viscosity-temperature characteristics, anti-aging performance, storage stability, rheological properties and smoke emission of composite modified asphalt were compared and studied. The results showed that it had excellent viscosity-temperature characteristics, anti-aging durability and rheological properties. The storage stability was further improved, the SO₂ emission was reduced by about 25% compared with the SBS modified asphalt, and the NO₂ and NO_X emissions were reduced by more than 50%.

(2) Comparative analysis results of the microscopic morphology and chemical distribution of functional groups of the composite modified asphalt, combined with the analysis of the surface morphology of the rubber powder and clarified its modification mechanism. In the composite modified asphalt, the desulfurization rubber powder and SBS modifier were uniformly dispersed and cross-linked with each other. The interface between the desulfurization rubber powder-SBS-asphalt was blurred, sol-gel changes occur, chemical bond changed and grafting reactions existed, and a more stable three-dimensional network structure was formed. The modification process was a compatible and stable modification in which physical blending and chemical reaction coexist.

(3) The road performance of the composite modified asphalt AC-13 and SMA-13 graded mixture was verified. The results showed that the composite modified asphalt met the current specifications, had excellent high-temperature rutting resistance, and was more prominent in the discontinuous gradation. The low-temperature crack resistance was slightly lower than that of the SBS modified asphalt, and the water stability was equivalent to that of the SBS modified asphalt, both reaching more than 90%.

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