基于MMLS3的改性沥青混合料高温稳定性研究  

High Temperature Stability of Different Modified Asphalt Mixtures Based on MMLS3

作　　者：武金婷[1] 叶奋[1] 赵倩倩[1] 

机构地区：[1]同济大学道路与交通工程教育部重点实验室,上海201804

出　　处：《建筑材料学报》2012年第5期654-659,共6页Journal of Building Materials

基　　金：国家自然科学基金资助项目(50968016);上海市科学技术委员会项目(0820120240;1600-237-180)

摘　　要：运用最先进的小型加速加载设备MMLS3(1/3model mobile load simulator)对常见的用于上、中面层的4种改性沥青混合料进行了高温稳定性试验,提出了适合中国的MMLS3室内加速加载的各项试验参数.通过研究改性沥青混合料的实际抗车辙性能,得出沥青混合料高温稳定性能的优劣顺序为:SBS橡胶复合改性SMA-13,SBS改性AC-20C,SBS改性AC-13C,SBS橡胶复合改性OGFC-13,岩沥青改性AC-20C.由于OGFC-13的大空隙结构,必然要在某种程度上牺牲其强度、抗剪切性能及耐久性,不建议在重交通的高速公路上使用其作为表面层.高温重载或超限地区应加强中面层的优化设计.MMLS3加载试验及常规动稳定度试验在衡量空隙率差距小的沥青混合料时,两者试验结果具有较好的一致性;而对于不同沥青混合料,当其空隙率差距大时,应根据需要选择合适的试验或评价方法.With the most advanced accelerated loading equipment MMLS3, high temperature test of four kinds of asphalt mixtures usually used as surface or middle course of roads were carried out to obtain guid- ance for their application. The test result shows that the improvement order of high temperature stability performance is SMA-13, AC-13C, OGFC and AC-20C. Because of the large void structure which weakens its strength, shear performance and durability to a certain extent, OGFC is not suggested to be used as surface of highway with heavy traffic. The middle course of roads in the area involving high temperature and overloading or overruning needs an optimization design. When evaluating asphalt mixtures with small void discrepancy, the MMLS test and the routine DS have quite consistent results, and contrarily it is nec- essary to choose suitable method for evaluating mixture＇s high temperature stability.

关 键 词：1/3行车荷载模拟系统(MMLS3) 加速加载试验(APT) 沥青玛蹄脂(SMA) 开级配磨耗层(OGFC) 沥青混合料(AC) 高温稳定性 

分 类 号：U414[交通运输工程—道路与铁道工程]