采用共混复合改性技术研发一种新型高黏沥青,通过基质沥青、苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)、C₉石油树脂(C9PR)、增溶剂等原材料优选,确定了SBS/C9PR高黏沥青的组成材料及剂量方案,结合物理性能、荧光显微、多应力蠕变恢复(MSCR)、低温弯曲梁流变(BBR)和动态剪切流变(DSR)实验,并与主流高黏沥青的物理性能、相态结构、高低温流变性能和储存稳定性进行比较。结果表明,SBS/C9PR高黏沥青的组成材料及掺量方案为:SK70^#基质沥青;SBS改性剂(LG501∶LG411=1∶1)、C9PR＿3、增溶剂(糠醛抽出油)和交联剂(硫磺)掺量分别为4%、5%、2%和1‰;与普通SBS,以及TPS和SINOTPS高黏沥青相比,SBS/C9PR高黏沥青相态分布更加均匀,因为C9PR和增溶剂增加了SBS与沥青的相容性,从而使其表现出更优的储存稳定性;MSCR实验表明,SBS/C9PR高黏沥青具有良好的高温和低温流变性能,高温分级为PG64E,适用于路面温度不超过64℃的极重交通沥青路面。

A new type of high viscosity modified asphalt was developed by blending and composite modification technology.By optimizing raw materials such as base asphalt,styrene-butadiene-styrene block copolymer(SBS) copolymer,C₉ petroleum resin(PR) and solvent,the composition material and dosage scheme of SBS/C₉PR were determined.Combined with physical properties,fluorescence microscopy,multi-stress creep recovery (MSCR) and dynamic shear rheology (DSR) tests,the physical properties,phase structure,high temperature rheological properties and storage stability of SBS/C₉PR were compared with those of Japanese TPS and domestic SINOTPS high-viscosity asphalt.The results shown that the recommended SBS/C9PR compositions and dosage schemes were SK70 base asphalt,SBS modifier (LG501∶LG411=1∶1),C9PR＿3,solubilizer (furfural extract oil) and crosslinking agent (sulfur) with 4%,5%,2% and 1‰,respectively.The phase distribution of SBS/C9PR was more uniform,and the compatibility between SBS and asphalt was increased by C₉PR and solvent addition,thus showing better storage stability.SBS/C₉PR had good rheological properties at high temperature.It was classified as PG64E at high temperature.It was suitable for extremely heavy traffic asphalt pavement whose pavement temperature did not exceed 64℃.