摘要
采用动态剪切流变仪对基质沥青和SBS改性沥青进行流变测试评价,利用应力扫描方式评价了这2类沥青在60℃下的屈服特性和线性黏弹区间,利用频率扫描考察了其结构松弛特性.结果表明:基质沥青和SBS改性沥青具有明显不同的流变特点,前者在60℃下存在明显的屈服特征和线性黏弹区间,而后者只呈现出整体的屈服行为,并不存在明显的线性弹区间;由于高弹性SBS改性剂的引入,使改性沥青结构松弛时间变小,从而使其可回复能力远高于基质沥青.
Rheological properties of two kinds of asphalt binders were evaluated by dynamic shear rheometer（DSR）,and the main tests were dynamic stress and frequency sweep tests to obtain yielding and relaxation information in high temperature of 60℃.The final analysis shows that there are apparent differences between plain asphalt and SBS modified asphalt,the former has typical yielding characteristics and linear viscoelastic zone,but SBS modified asphalt only experiences the yielding process with no apparent linear viscoelastic zone.Meanwhile,the relaxation time of SBS modified asphalt decreases with the increase of polymer content,thus resulting in an improvement of the structure recovery ability,but plain asphalt has no apparent relaxation performance.
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2016年第3期596-601,共6页
Journal of Building Materials
基金
交通运输部应用基础研究项目(2013319781140)
山东省自然科学基金资助项目(ZR2009FL020)
山东省交通科技项目(2012Y01)
关键词
沥青
屈服特性
线性黏弹区间
频率扫描
松弛特性
PG分级
asphalt
yielding property
linear viscoelastic zone
frequency sweep
relaxation performance
PG grading
