调制煤沥青对复合改性乳化沥青性能的影响

摘要

In order to improve the performance of modified emulsified asphalt,composite modified emulsified asphalt was prepared by adding modulated coal tar pitch and modified by SBS.Results showed that,with the in-crease of addition of modulated coal tar pitch,the ductility and softening point became better.After adding 20%modulated coal tar pitch,ductility increased to 30 cm,softening point increased to 70 ℃,composite modified e-mulsified asphalt had good performance in high or low temperature.Fluorescence microscopy and infrared spec-tral analysis showed that there were some chemical grafting reactions happened between SBS and asphalt mate-rials in the process of modification besides the physical modification,SBS formed network structure in asphalt material,so modification improved the bonding strength of SBS and asphalt material,and made the asphalt sys-tem more stable.%为提高复合改性乳化沥青的使用性能，采用加入调制煤沥青的方式和用 SBS改性制备复合改性乳化沥青。结果表明，随着调制煤沥青添加量的增加，复合改性乳化沥青的延度和软化点得到改善。当添加20％调制煤沥青后，延度提高至30 cm，软化点升到70℃，复合改性乳化沥青已具有良好的高低温性能。荧光显微图像和红外光谱分析表明，在改性过程中 SBS与沥青材料之间除物理改性外，还发生了某种化学接枝反应形成网络构架，从而提高了 SBS与沥青材料的结合强度，使得沥青体系更加稳定。