空隙率对沥青混凝土抗冻融循环破坏性能的影响研究

季节交替对沥青混凝土路面造成的冻融循环破坏是沥青路面水损坏的主要形式之一。传统方法主要是通过冻融循坏破坏前后沥青混凝土劈裂强度的变化来间接反映沥青混凝土的抗冻融破坏能力。为了更加直观地评价沥青混凝土的抗冻融破坏性能,文章从沥青混凝土空隙率的变化方面研究这一问题。研究结果表明,经历相同条件的强冻融循环破坏后,相比小空隙率的沥青混凝土试件,大空隙率的沥青混凝土试件空隙率的增长更加显著。说明大空隙率的沥青混凝土路面对冻融循环破坏更加敏感。

The freeze-thaw cycle damage to asphalt pavement,caused by the season's rotation,is one of the main moisture-induced damage types.Traditionally,the freeze-thaw cycle damage resistance of asphalt mixture is indirectly revealed by the change percent of asphalt mixture's tensile strength.In order to show out the freeze-thaw cycle damage resistance of asphalt mixture intuitively,the change of asphalt mixture's air voids during freeze-thaw cycle damage is adopted in this research.The results show that the specimens with larger air voids are much more sensitive to freeze-thaw cycle damage.For the increment rate of air voids during freeze-thaw cycle damage is obviously bigger than that for these specimens with original smaller air voids.