纳米ZnO改性沥青的制备及性能研究

Preparation and properties analysis of asphalt modified by nano-ZnO

为探究纳米ZnO改性沥青的路用性能,采用高速剪切法制备了纳米ZnO掺量分别为2%,4%,6%及8%的改性沥青,并通过光学显微镜、傅里叶红外光谱仪(FTIR)及差示扫描量热仪(DSC)对改性沥青的微观形貌、化学构成及热稳定性等性能进行表征与分析,再采用动态剪切流变仪和布氏粘度计分别对改性沥青的高温流变性能及黏温特性进行测试。结果表明,纳米ZnO能够均匀分散于基质沥青中,且与沥青发生交联反应,生成一种空间网状结构;纳米ZnO对基质沥青既有物理改性也有化学改性;随着纳米ZnO掺量的增大,改性沥青的低温性能及热稳定性均得到不同程度的改善;改性沥青呈现出更优的高温抗车辙能力及黏温特性。

In order to investigate the effects and mechanism of nano-ZnO on asphalt,the high-speed shearing method was used to prepare nano-ZnO modified asphalt by the proportion of 2%,4%,6%and 8%.The microstructure,chemical composition and thermal properties of the modified asphalt were investigated by optical microscope,fourier infrared spectrometer(FTIR)and differential scanning calorimetry(DSC),respectively.Moreover,the rheological properties and viscosity-temperature properties of modified asphalt were tested by dynamic shear rheometer and brinell viscomete,respectively.The results showed that the nano-ZnO could be dispersed uniformly in the asphalt,and formed a spatial network structure;asphalt was both chemically and physically modified by nano-ZnO;the low temperature performance and thermal stability of modified asphalt were improved to different degrees with the increasing content of nano-ZnO;due to the small size effects and surface effects of nano-ZnO,the modified asphalt exhibited a better anti-rutting ability at high temperature and a excellent viscosity-temperature performance.