废橡胶粉/SBS复合改性沥青制备研究

以SK AH-70为基质沥青,外掺废胶粉和SBS,采用高速剪切法制备复合改性沥青。通过正交实验考察了沥胶比、糠醛抽出油掺量和稳定剂掺量对沥青性能的影响,确定最优条件为:沥胶比为3,糠醛抽出油加入量4%,稳定剂加入量3‰。在最优条件下制备的复合改性沥青软化点为61.0℃,5℃延度为30.0 cm,弹性恢复为85%。废胶粉/SBS复合改性沥青的性能明显优于胶粉改性沥青,而稍低于SBS改性沥青,但是其成本低廉、易于施工,并且性能达到SBS改性沥青的相关要求,具有良好的应用前景。

STUDY ON THE PREPARATION OF CRUMB RUBBER/SBS COMPOSITE MODIFIED ASPHALT

Crumb rubber and SBS were used to modify asphalt (SK AH-70) by high shearing technology. In this paper, the effects of the mass ratio of base asphalt in pre-blending mixture, the amount of aromatics oil and stabilizing agent on the performance of modified asphalt were investigated through orthogonal experiment design to obtain the optimal preparation conditions. Under the optimal conditions of a mass ratio of asphalt in pre-blending mixture of 3, an aromatics oil added amount of 4% and a stabilizing agent added amount of 3‰, the obtained modified asphalt having a softening point of 61.0℃, a 5℃ ductility of 30.0 cm and an elastic recovery of 85%. Compared with SBS modified asphalt and crumb rubber modified asphalt, the performance of crumb rubber/SBS modified asphalt was better than the latter and a bit lower than the former, yet it could still meet the requirements of SBS modified asphalt, besides, it had the advantages of low cost and easy for construction, which indicated that it should have a promising future.