摘要
为了研究低温寒冷地区沥青胶浆的交互作用能力及流变性能,采用动态剪切流变仪(DSR)对经历不同冻融循环次数后的石灰岩和花岗岩矿粉沥青胶浆进行频率扫描试验,并采用多种方法对试验数据进行分析处理.结果表明:未经历冻融的沥青胶浆及冻融循环次数达到59次之前的沥青胶浆,其主曲线在高频低温区叠合较好,而在低频高温区出现了严重的分叉,表明沥青胶浆在低温时为均相共混体系,高温时存在"时温叠加失效";主曲线、Han图、vGP图和Cole-Cole图分析均表明,经历59次冻融循环之后沥青胶浆在低温下表现出明显的相分离,Cole-Cole图中曲线不再表现出半圆单弧特征,说明沥青胶浆交互作用能力减弱,沥青与矿粉填料之间的微观界面已被破坏.
In order to study the interaction ability and rheological properties of asphalt mastic in chilly areas, the dynamic shear rheometer(DSR) was used to carry out the frequency sweep tests of limestone and granite powder asphalt masticunder different freeze-thaw cycles. The results show that master curves of asphalt mastic are well superimposed at high-frequency and low-temperature regions but bifurcated seriously in low-frequency and high-temperature regions before freeze-thaw and 59 freeze-thaw cycles, which indicates that asphalt mastic is a homogeneous blend system at low temperature, but there exists "time-temperature superposition failure" at high temperature. According to the analysis of master curves, Han diagrams, vGP diagrams and Cole-Cole diagrams, the asphalt mastic exhibits obvious phase separation at low temperature after 59 freeze-thaw cycles. The curves of Cole-Cole diagram no longer show characteristic of single semicircular arc. The interaction ability of asphalt mastic is weakened. And the micro interface between asphalt and mineral powder filler has been destroyed.
作者
李晓民
豆莹莹
徐慧宁
魏定邦
LI Xiaomin;DOU Yingying;XU Huining;WEI Dingbang(Key Laboratory of Road and Bridge and Underground Engineering of Gansu Province, Lanzhou Jiaotong University, Lanzhou 730070, China;Gansu Province Transportation Planning, Survey and Design Institute Co., Ltd., Lanzhou 730030, China;School of Transportation Science and Engineering, Harbin Institute of Technology,Harbin 150090, China)
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2019年第5期831-838,共8页
Journal of Building Materials
基金
甘肃省自然科学基金资助项目(1606RJZ042)
甘肃省科技计划项目(18YF1GA035,18YF1GA036)
关键词
冻融循环
沥青胶浆
动态剪切流变仪
交互能力
流变性能
freeze-thaw cycle
asphalt mastic
dynamic shear rheometer(DSR)
interaction ability
rheological property
