The reuse of coarse aggregate (CA) on clay-based materials is a sustainable and cost effective solution to minimize the extraction of natural farmland resources and reinforce the mechanical behaviour of impervious materials. However, limited knowledge is available regarding the compactability and permeability of CA-clay mixtures and their intrinsic connections. This study reports the results of a series of modified dynamic compaction tests and triaxial permeability tests performed on impervious clay materials reinforced with various contents of CA. Results demonstrate that compaction behaviour of CA-clay mixtures changes significantly with coarse aggregate content (C_g). A peak value of global maximum dry density is achieved at C_g = 70%, while the fine clay matrix is compacted to its densest state when C_g<30%. The permeability, as a good indication of meso-structure in CA-clay mixtures, is significantly dominated by coarse aggregate content as well as the clay matrix void ratio. From the perspective of preferential flow path concept, permeability reaches a lowest value at C_g = 30%. Due to the clay bridge effect induced by the heterogeneous density field, the larger the coarse particle size is, the smaller the permeability coefficient will become.

在粘土基材料上再利用粗骨料（CA）是一种可持续且具有成本效益的解决方案，可最大程度地减少自然农田资源的开采并增强不透水材料的机械性能。然而，关于CA-粘土混合物的可压实性和渗透性及其内在联系的知识有限。这项研究报告了一系列修改后的动态压实试验和三轴渗透性试验的结果，这些试验是对各种含量的CA增强的不渗透粘土材料进行的。结果表明，CA-粘土混合物的压实性能随粗骨料含量（C _g）的变化而显着变化。在C _g处达到整体最大干密度的峰值 ＝ 70％，而当C _g＜30％时，细粘土基质被压实至其最稠密的状态。作为CA-粘土混合物中细观结构的良好指示，渗透率主要由粗骨料含量以及粘土基质空隙率决定。从优先流动路径概念的角度来看，渗透率在C _g  = 30％时达到最低值。由于非均质密度场引起的粘土桥效应，粗粒度越大，渗透系数越小。