The microstructure of clay plays an important role in its mechanical behaviour. During the sedimentation process, kaolinite particles form distinct configurations controlled by the surface charge induced electrostatic forces and the pH of their environment. At low-pH conditions, edge-to-face arrangements dominate, while high-pH solutions favour face-to-face stacking. A specific sample preparation method was developed to observe the fabric of clay slurry using Scanning Electron Microscopy (SEM). SEM observations revealed that flocculated clay slurry displayed a card-house-like fabric with larger pores, whereas dispersed samples exhibited parallel particle orientation and smaller pores. Oedometric tests showed higher compressibility in flocculated samples at low stress levels due to their larger pore size and the collapse of the clay aggregates. However, as loading progressed, the microstructures aligned, the mechanical behaviour of both samples became similar, particularly during the unloading path. SEM observations showed that the initially distinct microstructures gradually converge, becoming indistinguishable at high stress level. These findings emphasize the interplay between initial particle arrangement and its evolution under loading, offering insights into the mechanical response of sedimented kaolinite under different environmental conditions.