SBS改性沥青的动态力学性能

通过1种基质沥青、4种苯乙烯-丁二烯-苯乙烯(SBS)改性剂制备的13种改性沥青的动态力学试验,分析比较了原样沥青和旋转薄膜烘箱试验(RTFOT)老化沥青的动态力学温度谱试验结果,讨论了SBS改性沥青动态力学性能的变化机理,得出了改性剂的种类和剂量对其动态力学性能的影响.结果表明,低温下改性沥青的动态力学性能与基质沥青性能有关,高温时则取决于SBS改性剂的性质,RTFOT老化后因SBS的裂化与降解使改性沥青的弹性成分产生损失,其性能向基质沥青特性转变.

Dynamic Mechanical Properties of SBS-Modified Asphalt

According to the tested results via dynamic shear rheometer for 13 types of SBS-modified asphalts composed of one base-asphalt and 4 styrene-butadiene-styrene(SBS) polymers,the temperature spectra of the original asphalt and the aged asphalt after the rolling thin-film oven test(RTFOT) were compared,and the variation mecha-nism of the dynamic mechanical properties for the modified asphalts was discussed.Furthermore,the effects of modifier type and dosage on the dynamic mechanical properties were investigated.The results show that the low-temperature dynamic mechanical properties of the modified asphalts depend on the property of the base asphalt,while the high-temperature properties rely on the property of SBS polymers,and that,during the RTFOT aging,there occurs the deterioration and degradation of SBS polymers,which may result in the loss of elastic components of the SBS-modified asphalts and the performance variation of the SBS-modified asphalt like the base asphalt.