煤基再生材料对老化沥青流变性能的影响

Effect of Coal Based Recycled Material on Rheology of Aged Asphalt

以煤沥青和洗油为主要原料调制了一种新型沥青再生材料,并研究其对老化沥青的再生效果。实验结果表明,加入质量分数8%的再生材料可有效恢复老化沥青的针入度、软化点和族组成,延度可恢复至45.8cm;考察了不同再生材料添加量对沥青流变性能的影响,结果表明加入w=8%的再生材料可使老化沥青的黏弹性恢复50%,黏流性基本未变;通过与石油基再生材料进行对比,发现石油基再生材料对老化沥青的抗断裂能力恢复效果更好,而煤基再生材料在再生时不损失沥青的抗变形能力。

Coal tar pitch and wash oil were used as the main raw materials of a new asphalt recycled material. The regeneration experiment showed that penetration, softening point and component content of the aged asphalt could be recovered completely by adding w= 8% recycled material, while the ductility could be increased to 45.8 cm. The effect of adding the recycled material on rheology of the aging asphalt was also studied. Results showed that viscoelasticity of the regenerated asphalt could be recovered by 50%, and flow property was rarely changed. Compared with a petroleum based recycled material, the coal based recycled material had less effect on recovering anti fracture ability of the aged asphalt, but could maintain the anti-deformation ability.