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以介孔硅藻为改性剂改性制备了不同掺量的介孔硅改性沥青,通过IR、SEM、OM对其改性过程及其改性机制进行了微观分析,并根据IR、SEM以及沥青四组分的分析结果绘制出改性过程模型图,利用TG及针入度、软化点、延度等测试方法对不同掺量介孔硅改性沥青与原质沥青的相关性能进行了比较。结果表明:介孔硅改性沥青的过程没有明显的化学变化,主要为介孔硅物理吸附沥青的过程,介孔硅由于多孔、比表面积大的特性更易吸收沥青中流动性强、分子量小的溶剂组分(饱和组分及芳香组分)到其内部孔隙和周围,它们在温度降低时冷凝硬化与介孔硅相互固定形成均匀稳定的整体,这是介孔硅改性沥青高温性能提高的主要原因;介孔硅藻的掺量与改性沥青性能并不呈正相关,改性沥青的温度敏感性和低温性能会随着掺量的增加而变差,介孔硅质量分数为13%时,介孔硅改性沥青的综合性能相对较好。
The mesoporous silica modified bitumen was prepared by using mesoporous diatom as modifier. The microstructure of the mesoporous silica modified bitumen was characterized by IR, SEM and OM, The results of the four components draw the model map of the modification process. The relative performance of different content mesoporous silica modified bitumen and bitumen was compared by the test methods of TG, penetration, softening point and ductility. The results show that there is no obvious chemical change in the process of mesoporous silica modified bitumen, which is mainly due to the physical adsorption of bitumen by mesoporous silica. Mesoporous silica, due to its porous and large specific surface area, is more easily absorbed in bitumen with high fluidity and low molecular weight Solvent components (saturated components and aromatic components) to its internal pores and the surrounding, they reduce the temperature when the condensation hardening and mesoporous silica fixed to each other to form a uniform and stable, which is mesoporous silica modified asphalt high temperature performance The main reason is that the content of mesoporous silica is not positively correlated with the modified asphalt, the temperature sensitivity and low temperature performance of the modified asphalt deteriorate with the increase of the content of mesoporous silica. When the mass fraction of mesoporous silica is 13% Hole silicon modified asphalt overall performance is relatively good.