夏热冬寒地区纳米复合改性沥青研究

Study on Nano Composite Modified Asphalt in Hot Summer and Cold Winter Region

为满足夏热冬寒地区对沥青高温稳定性和低温抗裂性的要求,采用2%Nano-ZnO＋0.5%Nano-TiO2＋3.7%SBS、5%Nano-ZnO＋4.2%SBS2种改性方案对SK-70基质沥青进行复合改性,制备两种纳米复合改性沥青.对基质沥青、纳米复合改性沥青分别进行常规试验、薄膜烘箱老化试验、DSR试验和BBR试验,对比研究了纳米复合改性沥青的高温稳定性、低温抗裂性.利用扫描电镜、荧光显微镜、红外光谱技术研究了纳米材料和聚合物复合改性沥青的微观结构和改性机理.研究结果表明,本文选出的纳米改性剂均匀的分布在基质沥青中,可以改善沥青与聚合物改性剂之间的相容性,此外,基质沥青的高、低温性能大幅改善,将其应用于夏热冬寒区,能提高沥青路面的高温抗车辙和低温抗裂的能力,为夏热冬寒地区沥青路面的设计和材料选择提供参考.

In order to meet the requirements of high temperature stability and low temperature cracking resistance in hot winter and cold winter regions,two modified schemes of 2% Nano - ZnO ＋ 0.5% Nano - TiO2 ＋ 3.7% SBS and 5% Nano- ZnO ＋ 4.2% SBS were used to modify the SK -70 matrix bitumen, and two kinds of nano composite modified asphalt were prepared. Conventional test, thin film oven aging test, DSR test and BBR test were carried out on matrix asphalt and nano composite modified asphalt. The high temperature stability and low temperature cracking resistance of nano composite modified asphalt were compared and studied. The microstructure and modification mechanism of nano composite materials and polymer modified bitumen were studied by scanning electron microscopy,fluorescence microscopy and infrared spectroscopy. The results show that the nanoscale modifier selected in this paper is evenly distributed in the matrix bitumen, which can improve the compatibility between the asphalt and the polymer modifier. In addition, the high and low temperature properties of the matrix bitumen are greatly improved. It can be applied to the hot and winter cold region, which can improve the anti rutting resistance and the low temperature crack resistance of the asphalt pavement. It provides reference for the design and material selection of asphalt pavement in hot summer and cold winter zone.