Han Daqian, Hu Guosheng, Zhang Jingting
School of Materials Science and Engineering, North University of China, Taiyuan 030051, China.
Polymers (Basel). 2023 Jan 4;15(2):256. doi: 10.3390/polym15020256.
Modified asphalt with high content SBS is widely used in asphalt pavement due to its excellent high and low temperature performance. However, its anti-aging performance is insufficient. In order to improve the anti-aging performance of SBS modified asphalt, nano-ZnO, nano-TiO, nano-SiO and polyphosphoric acid (PPA) were added to high content (6.5 wt%) linear SBS modified asphalt as anti-aging agents in this study. Moreover, Dynamic Shear Rheometer (DSR), Fluorescence Microscope, and Fourier Transform Infrared Spectroscopy were employed to reveal the mechanism, through the investigation of the rheological and microscopic properties of modified asphalt before and after aging. The results showed that the influence of nanoparticles on the rutting resistance and fatigue resistance of high content SBS modified asphalt is weak, mainly because there is only weak physical interaction between nanoparticles and the SBS modifier, but no obvious chemical reaction. The significant cross-networking structure of high content SBS modified asphalt even has an adverse effect on the anti-aging performance of nano-modifiers. However, PPA obviously makes the cross-linked network structure of SBS modified asphalt more compact, and significantly improves the performance after short-term aging and long-term aging, mainly due to the chemical reaction between PPA and the active groups in SBS modified asphalt.
高含量SBS改性沥青因其优异的高低温性能而广泛应用于沥青路面。然而，其抗老化性能不足。为了提高SBS改性沥青的抗老化性能，本研究将纳米ZnO、纳米TiO、纳米SiO和多聚磷酸（PPA）作为抗老化剂添加到高含量（6.5 wt%）线性SBS改性沥青中。此外，采用动态剪切流变仪（DSR）、荧光显微镜和傅里叶变换红外光谱仪，通过研究老化前后改性沥青的流变性能和微观性能来揭示其作用机理。结果表明，纳米颗粒对高含量SBS改性沥青的抗车辙性能和抗疲劳性能影响较弱，主要是因为纳米颗粒与SBS改性剂之间仅存在微弱的物理相互作用，而没有明显的化学反应。高含量SBS改性沥青显著的交联网络结构甚至对纳米改性剂的抗老化性能产生不利影响。然而，PPA明显使SBS改性沥青的交联网络结构更加致密，并显著提高了短期老化和长期老化后的性能，这主要是由于PPA与SBS改性沥青中的活性基团发生了化学反应。
