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中文题名:

 沥青混合料穿透型水气扩散影响因素研究     

姓名:

 柳子尧    

学号:

 1049721501636    

保密级别:

 公开    

论文语种:

 chi    

学科代码:

 082301    

学科名称:

 道路与铁道工程    

学生类型:

 硕士    

学位:

 工学硕士    

学校:

 武汉理工大学    

获奖论文:

 校优秀硕士学位论文    

院系:

 交通学院    

专业:

 道路与铁道工程    

研究方向:

 沥青路面水气扩散    

第一导师姓名:

 罗蓉    

第一导师院系:

 武汉理工大学    

完成日期:

 2018-03-20    

答辩日期:

 2018-05-18    

中文关键词:

 

水气扩散 ; 沥青混合料 ; 相对湿度差 ; 扩散系数

    

中文摘要:

       水气扩散是沥青混合料水损害的重要来源之一。研究沥青混合料的水气扩散性能与外界环境、混合料内部结构之间的关系对评价沥青混合料水损害至关重要。在现阶段研究中,水气在沥青路面不同服役环境及不同结构沥青混合料内的扩散规律尚不清晰,因此本文聚焦于研究沥青混合料在上述不同影响因素下的水气扩散规律。

       本文针对沥青路面普遍存在的穿透型水气运动,基于重量法设计水气扩散试验,模拟沥青路面在各湿度梯度作用下的水气运动,同时考虑不同温度、负压等沥青路面服役环境及不同结构层厚度、空隙等结构因素,测量水气穿透量随时间的变化情况。采用菲克第一定律计算水气扩散系数,研究各影响因素下水气在沥青混合料中的穿透型扩散规律,为后续研究沥青混合料水损害机理提供理论基础。本文的主要结论如下:

    (1)提出不同相对湿度差下的穿透型水气扩散试验方案,发现水气扩散通量与相对湿度差呈正比例关系,证明穿透型水气扩散过程遵循菲克第一定律,且各湿度差下的水气扩散速率比较接近。

    (2)试验温度范围内,两类试件(AC-20C和OGFC-13)水气扩散通量随温度呈指数型增长,扩散系数与温度遵循Arrhenius方程,且AC试件活化能高于OGFC试件,水气扩散系数随温度的增长速率明显低于OGFC试件,说明不同类型沥青混合料内水气扩散速率随温度的变化趋势类似,但对温度的敏感性会随着试件内部结构的不同而产生一定差异性。

    (3)提出负压下水气扩散试验方法,测量了不同真空度下沥青混合料水气扩散系数,发现水气扩散速率随真空度升高而增大,且负压下的水气穿透率较常压下有大幅提升;在常压下无法测量较大厚度、较低空隙的沥青混合料试件的水气扩散指标时,可采用负压环境养生的方法并根据扩散系数与压强的反比例关系实现常压和负压下水气扩散系数的转化。

    (4)负压下测得三种沥青混合料在常用结构层厚度下的扩散通量和扩散系数(OGFC > AC > FAM),说明水气扩散特性受混合料内部结构影响较大;随着结构层厚度的增加,各类试件水气扩散通量均减小,而水气扩散系数随之增大,反映出沥青混合料内部的不均匀性;对于空隙率越大、密实度越低的沥青混合料,厚度的增加对试件水气扩散速率的促进作用更显著,所反映的不均匀也更明显。

    (5)测量得到不同空隙范围AC和OGFC试件水气扩散系数,建立了两类混合料空隙率及连通空隙率与水气扩散系数的关系,确定了AC试件扩散系数增幅变化的拐点位置,表明不同级配特点沥青混合料的水气扩散速率和空隙率及连通空隙率的关系会有所差异。

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中图分类号:

 U414    

馆藏号:

 U414/1636/2018    

备注:

 403-西院分馆博硕论文库;203-余家头分馆博硕论文库    

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