Nano killer ve geri dönüştürülmüş beton ince malzemeleri içeren 3D baskılı betonun mekanik performansı

The integration of digital manufacturing technologies into the construction industry has led to a paradigm shift in conventional building practices by enhancing design flexibility, reducing material consumption, and improving overall efficiency. Among these technologies,3DCP offers significant potential by eliminating the need for formwork and enabling layer-by-layer fabrication. However, the mechanical behaviour of 3D-printed elements, particularly concerning interlayer bonding, anisotropy, and lack of reinforcement, differs considerably from traditionally cast concrete, posing challenges for structural reliability. A comprehensive experimental program was conducted to assess the influence of these additives on the flexural and compressive strength of the printed elements. Additionally, the mechanical properties of 3D-printed specimens were compared with those of conventionally cast counterparts to evaluate the effects of layer orientation and printing-induced anisotropy. A novel shear strength test procedure was developed to characterize the interfacial bonding performance of layered mortar samples. Furthermore, a numerical simulation of an unreinforced 3D-printed wall element was performed using finite element analysis to predict its lateral load bearing capacity and crack propagation under seismic loading conditions. The study higlights that while nano clay improves buildability, the inclusion of RCF affects compressive strength due to weak interfacial bonding and increased porosity. The findings contribute valuable insights into the design of printable, eco-friendly cementitious composites and underline the need for performance-based evaluation methodologies for 3D-printed structures.