镍铁矿渣纤维对道路沥青的改性机理

Modified Mechanism of Asphalt by Nickel-Ferrous Slag Fiber

以镍铁渣纤维作为改性剂制备道路改性沥青,以改性沥青的针入度、软化点、针入度指数等指标评价其对基质沥青性能的改善作用,并通过扫描电镜(SEM)、红外光谱(IR)、差示扫描量热法(DSC)等方法对镍铁矿渣纤维改性沥青的作用机理进行深入分析.研究结果表明:镍铁渣纤维可明显地改善沥青的高温性能、低温性能以及感温性能,而实现镍铁渣纤维对沥青性能改善作用的基本原因是其在物理共混的基础上,调整了沥青组成中轻质组分的相对比例,使得基质沥青的胶体类型更趋向于"溶胶-凝胶"型.

Nickel-ferrous slag fiber was used as modifier to produce road modified asphalt, and the performances of modified asphalt were evaluated by penetration, softening point and penetration index. The mechanism of modified asphalt by nickel-ferrous slag fiber was analyzed by means of scanning electron microscopy （SEM）,infrared spectroscopy （IR） and differential scanning calorimetry （DSC）. The results showed that the high-temperature performance, low- temperature performance and temperature-sensitive performance of asphalt can be improved by nickel-ferrous slag fiber. The reason for the good effect of nickel-ferrous slag fiber on asphalt performance is to adjust the relative proportions of light components of asphalt composition under the foundation of physical blending, which leading the colloid type of the matrix asphalt to be more“sol-gel”type.