【摘要】 为减缓煤气化炉渣的堆积和填埋带来的环境污染问题，将煤气化炉渣部分或全部替代天然矿粉，探究煤气化炉渣对沥青胶浆流变特性的影响。基于X射线衍射法和扫描电镜，对比分析煤气化炉渣和天然矿粉的矿物组成以及形貌特征；基于三大指标及黏度试验，研究不同煤气化炉渣替代率沥青胶浆针入度、软化点、延度及黏度的变化规律；采用动态剪切流变仪(DSR)对沥青胶浆进行温度扫描试验和多应力重复蠕变试验，分析沥青胶浆复数剪切模量、相位角、车辙因子、不可恢复蠕变柔量、变形恢复率随煤气化炉渣替代率增加的变化规律。研究结果表明，煤气化炉渣矿物组分的理化性质比天然矿粉稳定，具有相对较小的粒径以及较大的比表面积，其不规则的颗粒形状更易与沥青形成牢固的界面。随着煤气化炉渣掺量的增加，沥青胶浆的高温性能、抗剪切变形能力、弹性明显提高，温度敏感性下降，而其低温性能略有下降；随着温度的升高，煤气化炉渣对沥青胶浆高温性能改善效果减弱，对其粘弹组成比例影响变小；进一步研究发现煤气化炉渣在低应力下对沥青胶浆的弹性恢复效果更好，而在高应力下对沥青胶浆的抗车辙能力提高效果更为明显。研究结果可为煤气化炉渣作为填料应用于沥青路面提供参考。更多还原

【Abstract】 In order to alleviate environmental problems caused by the accumulation of coal gasification slag, the mineral powder in the asphalt mastic was partially or completely replaced by coal gasification slag, and the influence of coal gasification slag on the rheological properties of asphalt mastic was explored. Based on the X-ray diffractiometry and scanning electron microscope, mineral composition and morphological characteristics of coal gasification slag and mineral powder were compared and analyzed. Based on three physical indices and viscosity tests, the penetration, softening point, ductility and viscosity of asphalt mastic with different coal gasification slag replacement ratio were studied. Temperature scanning test and multiple stress creep recovery test were conducted to evaluate rheological properties of asphalt mastic using dynamic shear rheometer(DSR). The changes of complex modulus, phase angle, rutting factor, nonrecoverable creep compliance, and percent recovery with the increase of coal gasification slag replacement ratio were analyzed. The results show that the mineral composition of coal gasification slag is more stable than mineral powder. Coal gasification slag has relatively small particle size and large specific surface area, and its irregular particle shape is easier to form firm interface with asphalt. With the increase of coal gasification slag replacement ratio, the high-temperature performance, shear deformation resistance and elasticity of asphalt mastic significantly improved, the temperature sensitivity decreased, and its low-temperature performance slightly decreased. With the increase of temperature, the improvement of coal gasification slag on the high temperature performance of asphalt mastic weakened, and its influence on the viscoelastic composition ratio of asphalt mastic became small. Further research found that coal gasification slag had better elastic recovery effect on asphalt mastic under low stress. And slag had better permanent deformation resistance on asphalt mastic under high stress. The research results can provide reference for the application of coal gasification slag as filler to asphalt pavements.更多还原