富油层疲劳性能影响因素的灰色关联分析

Analysis of Factors Influencing Fatigue Performance of Rich-Bottom Using Grey Correlation Theory

用灰色关联理论方法研究了沥青路面富油层的疲劳试验结果.结果表明:影响富油层疲劳性能因素的顺序为:最大公称粒径>空隙率>油石比>0.075 mm筛孔通过率>软化点>4.75 mm筛孔通过率>针入度(25℃)>VMA(矿料间隙率).为提高富油层的抗疲劳性能,建议沥青混合料的最大公称粒径不宜过大,同时应增加沥青混合料油石比,减小沥青混合料空隙率;另外,0.075 mm应作为沥青混合料的关键筛孔孔径.

The results of fatigue experiment of asphalt road rich-bottom are analyzed by means of grey correlation theory. The results show that the importance of the factors in deciding the fatigue performance of rich-bottom has following sequence： nominal maximum aggregate size〉volume of air voids〉asphalt ratio（by mass） to aggregate〉percent passing 0. 075 mm sieve〉softening point.percent passing 4.75 mm sieve〉penetration （25 ℃）〉VMA. In order to improve the fatigue performance of rich-bottom, it is suggested that the nominal maximum aggregate size of asphalt mixture should not be too big; it is better to increase the asphalt ratio to aggregate, decrease the volume of air voids; 0. 075 mm should be taken as the key sieve pore