Storage stability of SBS modified bitumen based on mixed-level orthogonal array design  

基于混合水平正交设计的SBS改性沥青储存稳定性研究(英文)

作　　者：杨群[1] 何文华[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：《Journal of Southeast University(English Edition)》2012年第3期337-343,共7页东南大学学报（英文版）

基　　金：The National Natural Science Foundation of China (No.51178348)

摘　　要：The styrene-butadiene-styrene（SBS） modified bitumens with different contents of SBS modifiers are stored in different conditions to study the storage stability of SBS modified bitumen.Mixed-level orthogonal array design（OAD） is used and factors such as SBS modifier content,storage time,storage temperature and container size are chosen in a mixed-level OAD with an OA16（31×44） matrix.Parameters like the separation softening point difference（the separation difference of the ring and ball softening point of the top and bottom samples） and the average softening point（the arithmetic mean of the softening points of the top and bottom samples） are proposed to evaluate the separation and the ageing of modified bitumen during storage in this experiment,respectively.The results reveal that the separation and the ageing during storage exhibit a complicated variation for storage temperature and time.The separation softening point difference decreases with the storage temperature rising from 20 to 120 ℃ and increases with the temperature exceeding 120 ℃,and the average softening point drops with the storage time being prolonged.Different storage conditions have various effects on the storage stability of SBS modified bitumen.为了研究SBS改性沥青的储存稳定性,将不同SBS改性剂掺量的SBS改性沥青储存于不同条件下.采用混合水平正交设计,选取SBS改性剂掺量、储存时间、储存温度和容器尺寸作为混合水平正交设计OA16(31×44)中的因素.提出用离析软化点差(试样的顶部和底部环与球法软化点差)和平均软化点(试样的顶部和底部环与球法软化点的算术平均值)分别评价在储存期间改性沥青的离析和老化.结果显示,改性沥青的离析和老化随储存温度和储存时间呈现复杂的变化规律.当储存温度从20℃上升到120℃时,离析软化点差变小,当超过120℃时增大,而平均软化点随储存时间的延长而降低.不同储存条件对SBS改性沥青的储存稳定性的影响各有差异.

关 键 词：storage stability mixed-level orthogonal array design separation softening point difference average softening point 

分 类 号：U414[交通运输工程—道路与铁道工程]