短期老化对聚合物改性沥青流变性能的影响.pdf

第40卷,第2期
公路工程
2015年4月
ghway Engineering
Apr.,2015
短期老化对聚合物改性沥青流变性能的影响
王威,弓宁宁,邢永明
(内蒙古工业大学土木工程学院,内蒙古呼和浩特010051)
[摘要]针对内蒙古地区改性沥青应用特点,为研究短期老化作用对两种聚合物改性沥青:橡胶粉改性沥青
(CR)、SBS改性沥青流变性的影响,利用动态剪切流变仪(DSR)分别对两种沥青原样及经旋转薄膜烘箱老化(RT-
FOT)后的沥青试样进行动态剪切试验和重复蠕变恢复试验,通过对流变参数复合模量G“、相位角δ、以及动力粘
度m的分析,研究了两种聚合物改性沥青的流变学特性;并利用扫描电子显微镜对各沥青试样的微观结构形态进
行观察,从微观角度揭示了不同沥青性能存在差异的原因。结果表明:短期老化作用使沥膏变得硬脆,且可以提高
改性沥青的高温抗变形能力和变形恢复能力;短期老化作用对SBS改性沥青的影响较对CR改性沥青大;短期老
化使沥青的抵抗流体流动的能力增强。
关键词]聚合物改性沥青;流变学性能;微观结构;动力粘度;重复变
[中图分类号]U414.1[文献标识码]A
[文章编号]1674-0610(2015)02-0009-06
Effect of Aging on Rheological Properties of the Polymer
Modified Asphalt
WANG Lan, GONG Ningning, XING Yongming
College of Civil Engineering, Inner Mongolia University of Technology, Huhehot, Inner Mongolia
010051, China
I Abstract] According to the characteristics of the modified asphalt used in Inner Mongolia, in order
to study the influence of theological property of two kinds polymer modified asphalt(crumb rubber(CR)
modified asphalt and SBS modified asphalt)due to short-term aging effect, The dynamic shear rheometer
DSR )are used to get on dynamic shear test and repeated creep recovery test to study both the matrix as
phalt and after rotating thin film oven aging(RTFOT)asphalt specimen. Based on the analysis of rheologi
cal parameter composite modulus G", phase angle(6), and the dynamic viscosity of n, the rheological
properties of two kinds of polymer modified asphalt are studied Furthermore, by using the scanning elec
tron microscope(SEM to observe the microstructure of asphalt sample form and reveal the differences be
tween different asphalt performance from the microscopic view. The results showed that: Short-term aging
made asphalt hard and brittle, and can improve the high temperature deformation resistance and displace
ment restoring capacity of modified asphalt; The influence of short-term aging of SBS modified asphalt is
bigger than the CR modified asphalt The asphalt that beared short-term aging can enhance resistance to
fluid flow
Key words] polymer modified asphalt; rheological properties; microscopic structure; dynamic
viscosity; repeated creep
的替代物,能够起到改善路面使用性能(如抗疲劳
0引言
开裂,降低高温变形以及增强延度等)作用-】。在
改性沥青作为基质沥青在沥青路面使用过程中路面施工过程中由于温度过高会使沥青在热和氧的
[收稿日期]2014-11-2
基金项目]国家自然科学基金项目(11162012);国家自然科学基金项目(11462018);内蒙古自然科学基金项目(2014MS0505);内蒙古自
治区研究生科研例新资助项目(S20141012811)
作者简介]王岚(1966-),女,北京人,教授,博士,博士生导师,院长,从事道路工程材料研究。