摘要
为了比较改性沥青在较宽频率范围内的流变性能,选择SBS、高弹、高黏和高强等4种改性沥青与基质沥青进行动态力学分析.通过应变扫描试验,发现在相同复数模量时,4种改性沥青的线黏弹范围均小于基质沥青.在线黏弹范围内进行频率扫描试验,并应用时温等效原理分别构建复数模量和相位角主曲线,可区分不同改性沥青的性能差异.结果表明:高弹改性沥青拥有最窄的复数模量主曲线,且在全频范围内相位角最小,说明其感温性能和弹性恢复能力最好;高黏改性沥青和SBS改性沥青流变性能接近,但前者的高温性能优于后者;高强改性沥青在全频范围内复数模量最大,因而抗车辙性能最优.
In order to compare the rheological properties of different modified asphalts in a wide frequency range,base asphalt and four kinds of modified asphalts of Styrene-Butadiene-Styrene（SBS）,high-elasticity,high-viscosity and high-strength asphalts were determined by dynamic mechanical analysis（DMA）. By strain sweep test,it is found that the linear viscoelastic range of several modified asphalts is lower than that of base asphalt for the same complex modulus value.By frequency sweep test within the linear viscoelastic range,complex modulus and phase angle master curves were constructed based on time-temperature superposition principle to identify the performance of different modified asphalts.The results show that high-elasticity modified asphalt shows a marked improvement of temperature susceptibility and elastic recoverability with the shallowest complex modulus master curve and the lowest phase angle.High-viscosity and SBS modified asphalts have similar rheological properties,while the high-tempe-rature performance of the former is better than that of the latter.High-strength modified asphalt has the biggest complex modulus in full frequency range with the best rutting-resistance.
出处
《江苏大学学报（自然科学版）》
EI
CAS
北大核心
2011年第4期460-463,共4页
Journal of Jiangsu University：Natural Science Edition
基金
江苏省自然科学基金资助项目(BK2007085)
关键词
改性沥青
流变性能
动态力学分析
线黏弹范围
主曲线
modified asphalt
rheological property
dynamic mechanical analysis
linear viscoelastic range
master curve
