基于浸润速度计算沥青表面自由能的方法研究  

Study on Surface Free Energy Calculation Method of Asphalt Based on Wetting Velocity

作　　者：涂崇志 罗蓉[1] 张德润[1] 

机构地区：[1]武汉理工大学交通学院,武汉430063

出　　处：《武汉理工大学学报（交通科学与工程版）》2017年第1期82-86,共5页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：交通部建设科技项目(2014318J22120);中央高校基本科研业务费专项资金(2016-zy-016)资助

摘　　要：为准确计算沥青表面自由能参数,分析插板法测试沥青表面自由能过程中浸润速度对测试结果的影响,采用10种不同浸润速度测试2种沥青与4种测试溶液之间的动态接触角.根据动态接触角与速度之间的关系,建立数学模型并求解速度为0时,测试溶液与沥青之间的静态接触角.结果表明,前进过程得到沥青与测试溶液的动态接触角随浸润速度增大而增大,而相应计算得到表面能随浸润速度增大而减小;采用数学模型计算得到70#基质沥青静态接触角与3mm/min浸润速度下动态接触角,两者表面能变化率为39%,同样SBS改性沥青表面能变化率为3.7%.因此,根据插板法计算沥青表面自由能时,应采用不同浸润速度下的试验数据计算静态接触角,不能忽略浸润速度对测试结果的影响.In order to accurately determine the surface free energy components of the asphalt,this study investigates the effects of the wetting velocity on measurement of the surface free energy using the Wilhelmy Plate Method.Ten different wetting velocities are used to measure the two type of asphalt binders dynamic contact angle with four probe liquids.Mathematics models are established according to the relationship between the dynamic contact angle and wetting velocity,to predict the static contact angle when the wetting velocity is zero.Finally,the surface free energy of the asphalt can be calculated by static contact angle and dynamic contact angle respectively,and the change rates of the surface energy parameters obtained by the two methods are compared.The results show that：the dynamic contact angle increases with the wetting velocity in advancing process,while the surface free energy calculated by the dynamic contact angle decreases with the wetting velocity;the change rate of the surface free energy between dynamic contact angle（3mm/min）and the static contact angle is 39%for 70# asphalt binder,while the change rate of SBS modified asphalt is 3.7%.Therefore,when the surface free energy of asphalt is calculated according to the Wilhelmy Plate method,the static contact angle should be calculated by fitting the experimental data at different wetting velocity.

关 键 词：道路工程 沥青表面自由能 插板法 动态接触角 静态接触角 

分 类 号：U414.1[交通运输工程—道路与铁道工程]