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以硬质沥青为代表,研究探索了沥青颗粒化成型相关技术,并确定了工艺参数。钢带冷凝造粒法作为熔融造粒法的典型代表,适用于沥青类物质的颗粒化成型。针对成型后沥青颗粒在高温下彼此黏结的问题,采取隔离措施防止黏结。PEG和PVC作为不同裹覆方式的典型代表,可作为隔离材料防止沥青颗粒的黏结。裹覆PEG和PVC的硬质沥青颗粒可在50℃环境下保持颗粒良好。此外考察了隔离材料对硬质沥青微观性能的影响,结果显示:硬质沥青中相对低的饱和分与芳香分含量使得PEG和PVC难于在硬质沥青内分散均匀。FTIR结果显示,醚基的出现显示PEG对硬质沥青进行了化学改性,而PVC未对硬质沥青进行化学改性。本研究的沥青颗粒成型工艺和隔离措施可应用到基质和改性沥青的颗粒成型,实现沥青材料的冷运输。
With hard bitumen as the representative, the research related to asphalt granulation technology was explored, and the process parameters were determined. As a typical example of melt granulation, the strip condensation granulation method is suitable for the granulation of asphalt materials. Targeted at the formation of asphalt particles bonded to each other at high temperatures, to take measures to prevent the bonding isolation. As a typical representative of different coating methods, PEG and PVC can be used as insulation materials to prevent the adhesion of asphalt particles. Hard bitumen particles coated with PEG and PVC keep the particles fine at 50 ° C. In addition, the influence of the isolation material on the microscopic properties of the hard asphalt was also investigated. The results showed that the relatively low saturation content and the aromatic content of the hard pitch make the PEG and PVC difficult to disperse uniformly in the hard asphalt. The FTIR results show that the presence of ether groups shows that PEG chemically modified hard pitch, while PVC did not chemically modify hard pitch. The asphalt granule forming process and isolation measures in this study can be applied to the granulation of the matrix and the modified asphalt to realize the cold transportation of the asphalt material.