摘要
为研究水分在沥青膜中的扩散特性以及水分扩散行为参数与沥青组分间的关系,用重量法测定了沥青膜在不同浸水时间下的吸湿曲线,并分别基于Fick、Langmuir扩散模型对其吸湿曲线进行拟合,分析了水分扩散行为参数与沥青组分间的相关性.结果表明:水分在沥青膜中存在自由态和结合态2种形态,其扩散行为符合Langmuir扩散模型;浸水初期沥青膜中的水分扩散以吸收自由态水分为主,随着浸水时间的延长,沥青膜中结合态水分逐渐增加而后趋于饱和;沥青膜饱和吸水率、水分吸附系数与沥青质含量呈正相关关系,吸附系数与解吸附系数之比与沥青膜饱和吸水率呈较强的线性关系.
In order to investigate the moisture diffusion property into asphalt film and analyze the relationship between moisture diffusion parameters and asphalt components,the gravimetric method was used to determine the moisture uptake profiles of asphalt film immersed in distilled water at different immersion times.The moisture uptake profiles were used to fit the Fick and Langmuir diffusion models.The correlation between diffusion parameters and asphalt components was analyzed.The results show that there are two different states of moisture in the asphalt film,mobile phase and bound phase,and measured data of moisture absorption conforms to Langmuir diffusion model.In the initial stage of immersion,moisture diffusion into asphalt film is mainly mobile phase moisture.With the extension of immersion time,the bound phase moisture into the asphalt film increases and gradually becomes saturated.The content of asphalt was positively correlated with the saturated moisture absorption,and the ratio of adsorption coefficient to desorption coefficient was linearly correlated with the saturated moisture absorption.
作者
成志强
张晓燕
孔繁盛
CHENG Zhiqiang;ZHANG Xiaoyan;KONG Fansheng(Transportation Key Laboratory of Road Construction and Maintenance Technology of Loess Area,Shanxi Transportation Research Institute Group Co.,Ltd.,Taiyuan 030006,China;Shanxi Transportation Technology Research&Development Co.,Ltd.,Taiyuan 030032,China)
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2021年第2期399-404,共6页
Journal of Building Materials
基金
国家自然科学基金资助项目(51308329)
山西省交通运输厅科技项目(2019-1-6)
山西交通控股集团有限公司人才计划项目(19-JKKJ-66)
山西交通控股集团有限公司应用研究项目(19-JKKJ-19)。
关键词
沥青组分
水分扩散
重量法
扩散模型
asphalt component
moisture diffusion
gravimetry method
diffusion model
