矿粉对沥青胶浆流变性能影响及微观分析

Effect of mineral powder on rheological properties of asphalt mastic and microscopic analysis

为探究矿粉对沥青胶浆流变特性的影响规律,采用动态剪切流变仪分别对四种矿粉组成的沥青胶浆进行了不同加载模式下的流变试验,采用低温弯曲梁流变仪对胶浆进行低温小梁弯曲试验,分析了粉胶比、温度、荷载频率对沥青胶浆高低温流变特征参数的影响。借助X射线衍射(XRD)和扫描电镜(SEM),测试矿粉岩性特征和胶浆的微观形貌。结果表明:花岗岩矿粉对胶浆的增效行为最强,石灰岩胶浆的高低温性能最佳;矿粉的比表面积对胶浆的流变性能影响大于其矿料酸碱性组分对胶浆的流变性能影响;随着粉胶比的增加,沥青胶浆的复数剪切模量随之增加,但相位角变化微小;推荐四种胶浆的合理粉胶比为1.2;最佳粉胶比状态下,胶浆微观界面粘结状况最好。研究结果可为不同种类的填料在沥青路面的应用提供技术指导和理论支撑。

In order to explore the influence of mineral powder on the rheological properties of asphalt mastic,the rheological tests of asphalt mastics composed of four kinds of mineral powders were carried out under different loading modes by dynamic shear rheometer.The effects of filler-asphalt ratios,temperatures and loads frequency on the high-and low-temperature rheological parameters of asphalt mastic were analyzed.X-ray diffraction(XRD)and scanning electron microscopy(SEM)were used to investigate the microscopic morphology of mineral powder and mastic.The results showed that the granite had the strongest synergistic effect on the mastic,and the limestone asphalt mastic had the best high-and low-temperature performance.As the filler-asphalt ratio increased,the complex shear modulus of the asphalt mastic increased,but the phase angle had little changes.The best filler-asphalt ratio for the four types of mastic was recommended to be 1.2.Under the optimal filler-asphalt ratio,the micro-interface bonding of the mastic was the best.The research results could provide technical guidance and theoretical support for the application of different kinds of fillers on asphalt pavement.