Construction and demolition (C&D) wastes in pavement and railway structures are exposed to dynamic and static load combinations which results in breakage of particles. Past studies have investigated the effect of particle size and geometry on the breakage behavior of crushable materials; however, limited research has been conducted on the effect of loading rate and particle alignment on the breakage of C&D materials. This study focuses on the potential of particle breakage in crushed brick (CB) as a major component of the C&D waste stream. A series of single-particle crushing tests were performed on bulky and elongated CB particles with three different size groups at loading rates of 0.1–10 mm/min to investigate the impact of particle alignment in a granular assembly. The effect of particles’ shape and loading rate on the tensile strength and fractal dimension were examined. Discrete element method (DEM) was also utilized to monitor the internal stress distribution, breakage fragmentation and fracture energy during particle breakage. The tensile strength of CB particles was influenced significantly by particle size, shape and loading rate. In addition, it was found that the particle alignment not only increases the concentrated local failure leading to breakage but also affects the development of force chains and changes the amount of input/dissipated energy during failure.

路面和铁路结构中的建筑和拆除 (C&D) 废物暴露于动态和静态载荷组合，导致颗粒破裂。过去的研究调查了粒度和几何形状对可压碎材料破碎行为的影响；然而，关于加载速率和颗粒排列对 C&D 材料破损的影响的研究有限。本研究侧重于碎砖 (CB) 作为 C&D 废物流的主要组成部分中颗粒破碎的可能性。以 0.1-10 毫米/分钟的加载速率对具有三个不同尺寸组的大而细长的 CB 颗粒进行了一系列单颗粒破碎试验，以研究颗粒组合中颗粒排列的影响。检查了颗粒形状和加载速率对拉伸强度和分形维数的影响。离散元法（DEM）也被用来监测颗粒破碎过程中的内部应力分布、破碎破碎和断裂能。CB 颗粒的拉伸强度受颗粒尺寸、形状和加载速率的显着影响。此外，发现粒子排列不仅增加了导致断裂的集中局部失效，而且影响了力链的发展并改变了失效期间输入/耗散的能量。CB 颗粒的拉伸强度受颗粒尺寸、形状和加载速率的显着影响。此外，发现粒子排列不仅增加了导致断裂的集中局部失效，而且影响了力链的发展并改变了失效期间输入/耗散的能量。CB 颗粒的拉伸强度受颗粒尺寸、形状和加载速率的显着影响。此外，发现粒子排列不仅增加了导致断裂的集中局部失效，而且影响了力链的发展并改变了失效期间输入/耗散的能量。