基于动态力学的纳米碳粉-橡胶粉-SBS改性沥青相态结构分析

为了分析纳米碳粉、橡胶粉、苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)在沥青中的相态结构,首先对基质沥青和改性沥青进行物理性能试验、动态剪切流变试验(DSR),其次借助Han曲线理论和van Gurp-Palmen(vGP)图分析三种改性剂与基质沥青的相容性及相态结构。结果表明:在相同的试验条件下,2%纳米碳粉-18%橡胶粉-1.0%SBS改性沥青(以上均为质量分数)物理性能最佳,高低温性能较优;与基质沥青相比,添加改性剂后沥青材料出现微观相分离现象。在高温条件下,纳米碳粉-橡胶粉-SBS改性沥青相态结构较好,结合SEM照片阐释了改性机理,得出改性剂SBS可以有效改善纳米碳粉和橡胶粉在沥青中的骨架结构,形成三维连续稳定体系。

Phase Structure Analysis of Nano Carbon Powder-Rubber Powder-SBS Modified Asphalt Based on Dynamic Mechanics

In order to analyze the phase structure of nano carbon powder, rubber powder and SBS in asphalt, the physical performance test and dynamic shear rheology test (DSR) of matrix asphalt and modified asphalt were first carried out, and secondly, use Han curve theory and vGP diagram analysis the compatibility and phase structure of three modifiers and matrix asphalt. The results show that under the same test conditions, 2% nano carbon powder-18% rubber powder-1.0% SBS (all above are mass fraction) modified asphalt has the best physical properties and better high-temperature stability. Compared with matrix asphalt, the asphalt with modifier the material exhibits microscopic phase separation. Under high temperature conditions, the phase structure of nano carbon powder-rubber powder-SBS modified asphalt is better. Combining the SEM images to explain the modification mechanism, it is concluded that the SBS modifier can effectively improve the skeleton structure system of nano carbon powder and rubber powder in asphalt.