Granular recycled Construction and Demolition (C&D) materials reused in pavements, roads, and embankments experience particle breakage causing serious issues, such as settlement, during their service life. Particle breakage is of paramount importance for understanding the behaviour of particulate materials used not only in pavements, roads, and rail tracks, but also in the oil and gas industry and mineral processing. The engineering characteristics of a granular assembly is closely dependent on properties altered by breakage. Changes in particle properties of uniformly graded and spectrum of C&D specimens due to breakage under compressive loads were studied using three-dimensional Synchrotron Radiation-based Micro-Computed Tomography. The high-resolution 4D imaging was used to scan the inner body of the granular assemblies under compression. The resulting images were subsequently processed using a variety of techniques, including image thresholding, filtering, and segmentation, to identify and label each fragment in the assemblies. The fractal distribution of granular assemblies demonstrated that breakage becomes dominant in smaller particles rather than larger particles, where an increase in newly generated fine fragments brings about high coordination number surrounding the larger particles. More prominently, the results of particle morphology evolution showed a reversal trend as the stress increased. The C&D particles tended to generate more spherical fragments with higher aspect ratio, although by increasing the stress this tendency totally reversed. In addition, it has been found that the general trend of changes in particle shape obeys universality. In other words, for the materials tested; same generic evolution by increasing stress was observed irrespective of the material types or sizes. (C) 2017 Elsevier B.V. All rights reserved.