ABSTRACT

To evaluate the contact slip behaviour of particle on compaction characteristics of the asphalt mixture, the relation between contact slip behaviour and compaction characteristic was analyzed. The specimen was molded by Superpave Gyratory Compactor, and the densification curve average slopes and densification energy index were adopted to evaluate the compaction characteristics of asphalt mixture. Based on the self-developed mineral contact tester and interface contact slip tester, the maximum slip force and the maximum slip shear stress were proposed to respectively evaluate the contact slip behaviours of the loose asphalt mixture and the formed asphalt mixture. The results show that the contact slip behaviour is well correlated with compaction characteristics. The maximum slip force of loose asphalt and the maximum slip shear stress can effectively evaluate the compaction characteristics of different compaction stages. The more the coarse aggregates, the stronger the contact effect among the particles, and the more difficult the asphalt mixture is to be compacted. AC-13 asphalt mixture has better workability than SMA-13 asphalt mixture and OGFC-13 asphalt mixture. The larger the nominal maximum aggregate size, the more energy the asphalt mixture needs to attach the target degree of compaction, and the better the anti-slipping deformation ability.

摘要

为评价颗粒接触滑移行为对沥青混合料压实特性的影响，分析了接触滑移行为与压实特性之间的关系。试件采用Superpave旋回压实机成型，采用致密化曲线平均坡度和致密化能量指数评价沥青混合料的压实特性。在自主研发的矿物接触试验机和界面接触滑移试验机的基础上，提出了最大滑移力和最大滑移剪应力分别评价松散沥青混合料和成型沥青混合料的接触滑移行为。结果表明，接触滑移行为与压实特性密切相关。松散沥青的最大滑移力和最大滑移剪应力可以有效评价不同压实阶段的压实特性。粗集料越多，颗粒间的接触作用越强，沥青混合料越难压实。AC-13沥青混合料比SMA-13沥青混合料和OGFC-13沥青混合料具有更好的和易性。标称最大骨料尺寸越大，沥青混合料附着目标压实度所需的能量越大，防滑变形能力越好。AC-13沥青混合料比SMA-13沥青混合料和OGFC-13沥青混合料具有更好的和易性。标称最大骨料尺寸越大，沥青混合料附着目标压实度所需的能量越大，防滑变形能力越好。AC-13沥青混合料比SMA-13沥青混合料和OGFC-13沥青混合料具有更好的和易性。标称最大骨料尺寸越大，沥青混合料附着目标压实度所需的能量越大，防滑变形能力越好。