To expand the application range of modified asphalt and mixtures and effectively reduce the aggregation of nanomaterials in asphalt, nanocarbon/styrene butadiene styrene (SBS)/rubber powder composite-modified asphalt is proposed. This paper presents a laboratory study on the performance of nanocarbon/copolymer SBS/rubber powder composite-modified asphalt, and nanocarbon particles modified by titanate coupling agents as modifiers are selected. The nanocarbon/copolymer SBS/rubber powder composite-modified asphalt was prepared by a high-speed shearing method. The physical properties and rheological performance were assessed using ductility tests, softening point tests, penetration tests, dynamic shear rheometer (DSR) tests, and bending beam rheometer (BBR) tests. Furthermore, the mixture properties, including the high-temperature stability, low-temperature cracking resistance, moisture stability, and freeze-thaw splitting, were evaluated in the laboratory. The micromorphology of the base asphalt and composite-modified asphalt was examined by scanning electron microscopy (SEM), and the reactions between the modifiers and AH-70 base asphalt were studied by Fourier transform infrared spectroscopy (FTIR). The results reveal that the surface-modified nanocarbon and rubber powder additives substantially increased the softening point and penetration index of the base asphalt, with little obvious influence on the low-temperature performance. In addition, when nanocarbon/copolymer SBS/rubber powder composite-modified asphalt was used, the high-temperature stability and low-temperature cracking resistance of the nanocarbon/copolymer SBS/rubber powder composite-modified asphalt mixture were approximately 1.3 times those of the nanocarbon/rubber powder asphalt mixture. In terms of the micromorphology and reaction, the addition of the nanocarbon can increase the compatibility between the base asphalt and rubber powder, and then the addition of copolymer SBS can improve the structure of nanocarbon (after surface modification)/rubber powder-modified asphalt to form a stable network. Moreover, the physical reaction plays the dominant role in the modification process for the rubber powder and base asphalt, and chemical reactions occur in the modification process for the surface-modified nanocarbon and base asphalt.

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纳米碳/共聚物SBS /橡胶粉复合改性对沥青及混合料性能的影响研究

为了扩大改性沥青及其混合物的应用范围，有效减少沥青中纳米材料的聚集，提出了纳米碳/苯乙烯丁二烯苯乙烯（SBS）/橡胶粉复合改性沥青。本文对纳米碳/共聚物SBS /橡胶粉复合改性沥青的性能进行了实验室研究，并选择了以钛酸酯偶联剂改性的纳米碳颗粒作为改性剂。采用高速剪切法制备了纳米碳/共聚物SBS /橡胶粉复合改性沥青。使用延性测试，软化点测试，渗透测试，动态剪切流变仪（DSR）测试和弯曲束流变仪（BBR）测试评估了物理性能和流变性能。此外，包括高温稳定性在内的混合性能，在实验室评估了低温抗裂性，水分稳定性和冻融分裂性。通过扫描电子显微镜（SEM）观察了基础沥青和复合改性沥青的微观形态，并通过傅立叶变换红外光谱（FTIR）研究了改性剂与AH-70基础沥青之间的反应。结果表明，表面改性的纳米碳和橡胶粉添加剂显着提高了基础沥青的软化点和渗透指数，而对低温性能的影响不大。另外，当使用纳米碳/共聚物SBS /橡胶粉复合改性沥青时，纳米碳/共聚物SBS /橡胶粉复合改性沥青混合料的高温稳定性和低温抗裂性约为纳米碳/橡胶粉沥青混合料的1.3倍。在微观形态和反应方面，添加纳米碳可以提高基础沥青与橡胶粉之间的相容性，然后添加共聚物SBS可以改善纳米碳（表面改性后）/橡胶粉改性沥青的结构形成稳定的网络 而且，物理反应在橡胶粉和基础沥青的改性过程中起主要作用，而化学反应在表面改性的纳米碳和基础沥青的改性过程中发生。纳米碳/橡胶粉末沥青混合物的三倍。在微观形态和反应方面，添加纳米碳可以提高基础沥青与橡胶粉之间的相容性，然后添加共聚物SBS可以改善纳米碳（表面改性后）/橡胶粉改性沥青的结构形成稳定的网络 而且，物理反应在橡胶粉和基础沥青的改性过程中起主要作用，而化学反应在表面改性的纳米碳和基础沥青的改性过程中发生。纳米碳/橡胶粉末沥青混合物的三倍。在微观形态和反应方面，添加纳米碳可以提高基础沥青与橡胶粉之间的相容性，然后添加共聚物SBS可以改善纳米碳（表面改性后）/橡胶粉改性沥青的结构形成稳定的网络 而且，物理反应在橡胶粉和基础沥青的改性过程中起主要作用，而化学反应在表面改性的纳米碳和基础沥青的改性过程中发生。然后加入共聚物SBS可以改善纳米碳（表面改性后）/橡胶粉改性沥青的结构，形成稳定的网络。而且，物理反应在橡胶粉和基础沥青的改性过程中起主要作用，而化学反应在表面改性的纳米碳和基础沥青的改性过程中发生。然后加入共聚物SBS可以改善纳米碳（表面改性后）/橡胶粉改性沥青的结构，形成稳定的网络。而且，物理反应在橡胶粉和基础沥青的改性过程中起主要作用，而化学反应在表面改性的纳米碳和基础沥青的改性过程中发生。