界面污染对沥青小梁疲劳性能的影响研究

Study of Effect of Interface Pollution on Fatigue Performance of Asphalt Beam

为研究层间界面污染情况对沥青铺面整体使用性能所产生的影响,采用由不同类型混合料复合而成的、含有层间界面的复合沥青小梁,进行抗剪强度试验和四点弯曲疲劳试验;以机油污染和黄土污染作为污染源,调整污染量,用于模拟施工过程中可能存在的污染情况,并对其在不同工况下的层间抗剪强度和整体疲劳寿命进行测定.试验结果表明:(1)就各类影响层间抗剪强度因素的敏感性而言,机油污染的敏感性要高于黄土污染;(2)同等试验条件下,随着污染量的增加,复合小梁的疲劳寿命显著减小,一定程度后逐渐趋于稳定;(3)在相同污染量工况下,机油对于层间黏结性能的影响要大于黄土污染对其产生的影响;(4)就弯曲劲度模量损失量而言,当污染量达到一定程度后,复合小梁的层间黏结性就会丧失.

To discuss the effect of interlayer interface pollution on the overall usability of asphalt pavement,the asphalt beams composited of the different mixtures with interlayer interface are used to carry out the shear strength test and four-point bending fatigue test.Taking the machine oil pollution and loess pollution as the Pollution sources,the amount of pollution is adjusted to simulate the pollution conditions possibly existing in the construction.Its interlayer shear strength and the overall fatigue life are measured in the different construction conditions.The test results show that:(1)for the sensibility of various factors influencing the interlayer shear strength,the sensibility of machine oil pollution is higher than that of loess pollution.(2)Under the same test conditions,the fatigue life of composite beams decreases significantly with the increase of the amount of pollution,and gradually stabilizes after a certain extent(3)Under the same amount of pollution,the effect of machine oil on the interlayer bonding performance is greater than that of loess pollution.(4)According to the loss of bending stiffness modulus,when the amount of pollution reaches a certain level,the interlayer adhesion of composite beams will be lost.