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Meso-scale analysis on shear failure characteristics of asphalt-aggregate interface

机译：沥青-骨料界面剪切破坏特性的中尺度分析

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The bonding properties of asphalt-aggregate interface affect failure behaviors of asphalt mixtures. The objective of this study was to explore the shear failure characteristics of asphalt-aggregate interface by researching the interface shear strength and the continuous shear failure process. First, the oblique shear tests were conducted to investigate the interface shear strength under the influences of surface roughness, binder aging, loading rate, and aggregate type. Second, the direct shear tests were implemented to explore the continuous failure characteristics of the interface in terms of load-displacement curves. The interface bond-slip constitutive relation was established as a piecewise linear cohesive zone model. Finally, the grey relational analysis (GRA) was conducted to identify and prioritize the correlation between the applied experimental conditions and the interface bond-slip model parameters. The study results indicate that the improvement of surface roughness and loading rate could induce higher interface shear strength and a basalt aggregate with less silica has greater resistance to interface shear damage than a granite aggregate due to its stronger adhesion to binder. The interface shear resistance energy could benefit from higher surface roughness and normal stress level. Although binder aging could increase the interface shear strength, it imposes an adverse impact on the interface shear resistance energy. The established bond-slip constitutive model of the asphalt-aggregate interface could represent a three-stage evolutionary process of the interface shear failure. By performing the GRA, the binder aging condition would be the most significant factor affecting the interface shear performance when compared with the surface roughness and the normal stress.
机译：沥青-骨料界面的粘结性能影响沥青混合物的破坏行为。这项研究的目的是通过研究界面抗剪强度和连续剪切破坏过程来探索沥青-骨料界面的剪切破坏特性。首先，进行斜向剪切试验以研究在表面粗糙度，粘合剂老化，加载速率和骨料类型的影响下的界面剪切强度。其次，进行了直接剪切试验，以根据载荷-位移曲线探索界面的连续破坏特征。建立了界面键滑本构关系为分段线性内聚区模型。最后，进行了灰色关联分析（GRA），以识别和优先考虑所应用的实验条件和界面结合-滑移模型参数之间的相关性。研究结果表明，表面粗糙度和负载率的提高可引起更高的界面剪切强度，而二氧化硅含量较低的玄武岩骨料由于其对粘结剂的更强粘合力而比花岗岩骨料具有更大的抵抗界面剪切损伤的能力。界面抗剪切能可受益于较高的表面粗糙度和法向应力水平。尽管粘合剂的老化会增加界面剪切强度，但会对界面抗剪切能量产生不利影响。建立的沥青-骨料界面粘结滑移本构模型可以代表界面剪切破坏的三阶段演化过程。通过进行GRA，与表面粗糙度和法向应力相比，粘合剂老化条件将是影响界面剪切性能的最重要因素。

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