摘要
为了评价排水性沥青混合料的渗水能力,分析空隙率与渗透系数之间的关系,在前期研究成果的基础上,采用自行研制开发的横向渗透系数测试仪确定了排水性沥青混合料满足Darcy定律横向渗透的合理水力梯度,并建立了空隙率、有效空隙率、竖向渗透系数、横向渗透系数之间的关系.研究结果表明:常用排水性沥青混合料的合理水力梯度不大于0.03,随着空隙率的减小合理水力梯度增加;排水性沥青混合料空隙率与有效空隙率之间存在良好的线性相关性,而渗透系数与有效空隙率之间的相关性更好,竖向渗透系数与有效空隙率之间存在对数关系,横向渗透系数与有效空隙率之间存在线性关系,排水性沥青混合料横向渗透系数大于竖向渗透系数,两者之间存在良好的指数关系.
To evaluate the permeability of porous asphalt and the relationship between air void and permeability coefficient a device was designed to test the transverse permeability of porous asphalt.Based on the former conclusion the rational hydraulic gradient to satisfy the Darcy law was confirmed and the relationship between void and permeability was studied.The result indicates that rational hydraulic gradient of the common porous asphalt mixture should be less than 0.03 and the rational hydraulic gradient would increase with the decrease of air void.Moreover,there is linear relationship between air void and effective void and there is better relationship between permeability coefficient and effective void.There is logarithm relationship between vertical permeability coefficient and effective void and linear relationship between transverse permeability coefficient and effective void.Transverse permeability coefficient is larger than vertical permeability coefficient and there is exponent relationship between them.
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2009年第2期168-172,共5页
Journal of Building Materials
基金
国家自然科学基金资助项目(60472120)
关键词
道路工程
排水性沥青
Darcy定律
渗透系数
水力梯度
pavement engineering
porous asphalt
Darcy law
permeability coefficient
hydraulic gradient
