摘要
为探讨高速公路路面结构中沥青混合料的渗透性能,采用变水头柔性侧壁渗透仪分别测定了不同空隙率水平下SMA-13,AC-16,AC-20三种沥青混合料的渗透系数,同时结合相关研究成果,将空隙率影响沥青混合料渗透系数的变化关系进行对比分析,结果表明：1三种级配类型沥青混合料的渗透系数均随空隙率的增大而增大,渗透系数的拐点位置在空隙率8%~9%之间;2空隙率〈8%时,连续级配AC-16和AC-20的渗水系数低于间断级配SMA-13;空隙率〉8%时,SMA-13的渗透系数则小于AC-20;3相同空隙率的条件下,AC-16的渗透系数明显小于AC-20。
In order to investigate the permeability of bituminous mixture in expressway pavement structure,the permeability coefficient of SMA- 13,AC- 16 and AC- 20（ three kinds of bituminous mixtures） are measured by using variable head flexible sidewall permeameter. Combined with relevant research results,the change of permeability coefficient of bituminous mixture is analyzed comparatively. Results show that 1 the permeability coefficient of three kinds of graded bituminous mixture is increased with the increase of the porosity,and the inflection point of permeability coefficient is 8 % ~ 9 %. 2When the porosity is less than8 %,the permeability coefficient of AC- 16 and AC- 20 is lower than that of SMA- 13; And when the porosity is more than 8 %,the permeability coefficient of SMA- 13 is less than that of AC- 20. 3Under the same porosity,the permeability coefficient of AC- 16 is significantly less than that of AC- 20.
出处
《路基工程》
2016年第2期84-88,共5页
Subgrade Engineering
关键词
高速公路
沥青路面
沥青混合料
渗透系数
空隙率
expressway
bituminous pavement
bituminous mixture
permeability coefficient
porosity
