摘要
从沥青在沥青混合料中的实际薄膜状态为研究依据,引入润滑特性作为研究沥青的一个新属性,采用摩擦学理论及相应试验方法,研究沥青在沥青混合料中实际状态下的流变特性。采用球-三板和球-板摩擦试验方法,研究90℃~135℃温度区间下沥青和沥青胶浆的摩擦特征。研究结果表明:球-三板摩擦试验和球-板摩擦试验可以通过摩擦系数的差异,区分温拌沥青和基质沥青特征;温拌沥青和基质沥青摩擦曲线均呈现摩擦系数快速上升、达到峰值、缓慢衰减和快速失稳4个阶段,但是,温拌沥青具有显著的平台期;温度对摩擦试验有一定影响,随着温度增加,摩擦系数逐渐增大;沥青胶浆摩擦系数比沥青摩擦系数偏大50%以上,温拌沥青胶浆与基质沥青胶浆摩擦性能差异10%左右,胶浆差异性比纯沥青差异性低。与传统沥青的黏度一个参数评定沥青混合料压实机理不同,表面活性剂类温拌沥青作用机理由高温时裹附性和低温时摩擦性两个参数组成,而温拌剂的润滑效应随着作用时间更为显著。
On the basis of the actual film status of asphalt in asphalt mixture,the property of lubrication is brought in as a new attribute of asphalt,and tribology theory and test are utilized to study rheology of asphalt in the thin film.Tribology of asphalt and asphalt mastic is measured by ball-on-threeplates test and ball-on-plate test at the temperature ranging from 90℃ to 135℃.Results indicate that coefficient of friction is significantly different between base asphalt and WMA,which is measured by the ball-on-three-plates test and ball-on-plate test;the Tribology Curve of both base asphalt and WMA present a four-stage property:sharp increase,peak value,decay and destabilizing suddenly,but the Tribology Curve of WMA is with an obvious stable period;temperature has a certain impact on the friction test,with the increase of temperature,the frication factor increases gradually;the coefficient of friction of asphalt mastic is larger 50%than that of asphalt,and performance difference of friction between WMA mastic and base asphalt is around 10%,and asphalt mastic is less sensitive to coefficient of friction than asphalt.It is estimated compaction temperature only on the basis of viscosity traditionally,instead of that surfactant warm-mix asphalt can be estimated compaction temperature in according to coating at high temperature and tribology property at low temperature,and lubrication of warm additive play an important part with time.
作者
李兴海
张辉
周绪利
薛忠军
于静
LI Xing-hai;ZHANG Hui;ZHOU Xu-li;XUE Zhong-jun;YU Jing(Beijing Road Engineering Quality Supervision Station,Beijing 100076,China;Beijing Key Laboratory of Road Engineering Materials and Testing&Identification Technology,Beijing 100076.China)
出处
《公路》
北大核心
2020年第7期250-255,共6页
Highway
基金
中国博士后科学基金,项目编号2015M570967
中国博士后特别资助,项目编号2016T90058。
关键词
道路工程
温拌沥青
润滑特性
球-三板摩擦试验
摩擦系数
road engineering
warm mix asphalt
lubrication property
ball-on-three-plates
coefficient of friction
