纳米MHSN掺量的沥青混合料路用性能研究

为进一步提高沥青路面的路用性能，提出将多孔中空二氧化硅纳米颗粒（MHSN）作为沥青烟（VOC）的吸附剂，掺入到沥青混合料中，测定改性沥青的路用性能。通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）和Brunauer-Emmett-Teller（BET）等测试手段对水热法制备的纳米MHSN进行表征，并测定MHSN改性沥青的流变性能和VOC的排放量。结果表明：MHSN表面的孔径大部分连续分布在0到50 nm之间；MHSN的掺入降低了沥青的针入度和提高了软化点，提高了沥青的复合剪切模量，使沥青的相位角略有减小，可以提高沥青混合料的高温抗车辙性能；MHSN的掺入可以显著降低沥青VOC的总排放量，对沥青VOC中各组分的排放有不同程度的抑制作用。由此可见，纳米MHSN掺量的沥青混合料路用性能表现优越，可用于道路施工中，并且经济效益和社会效益明显。

Road Performance of Asphalt Mixture with Nanometer MHSN Content

In order to further improve the road performance of asphalt pavement, it is proposed that porous hollow silica nanoparticles (MHSN) be used as the adsorbent of asphalt smoke (VOC) and mixed into asphalt mixture to measure the road performance of modified asphalt. Nano-MHSN prepared by hydrothermal method was characterized by scanning electron microscope (SEM), transmission electron microscope (TEM) and Brunauer-Emmett-Teller(BET), and the rheological properties and VOC emission of modified asphalt were determined. The results show that most of the pores on the surface of MHSN are continuously distributed between 0 and 50 nm. The addition of MHSN reduces the penetration of asphalt, increases the softening point, increases the composite shear modulus of asphalt, and slightly reduces the phase angle of asphalt, which can improve the rutting resistance of asphalt mixture at high temperature. The addition of MHSN can significantly reduce the total emission of asphalt VOC and inhibit the emission of various components in asphalt VOC to varying degrees. It can be seen that the asphalt mixture with nanometer MHSN has excellent road performance and can be used in road construction, with obvious economic and social benefits.