Peridynamic Buildability-Analysis of 3D Printed Concrete Including Damage, Plastic Flow and Collapse (2023-07)¶

Without the restriction of formwork, 3D–printed concrete (3DPC) shows great advantages in construction; for the same reason, it presents stability problems, which greatly affect its buildability. In the present paper, a fluid-solid integrated peridynamic (PD) model is proposed for the modeling of 3DPC buildability. The considerations of fluid- and solid-like behaviors of 3DPC and the transition between them during the printing process are incorporated in by bond-based correspondence PD. Under the correspondence framework, the affinity hydration model is employed to combine the liquid bridge model and concrete damage model to capture the age-dependent material performance. In addition to the mechanical behavior, the simulation of the layer-by-layer printing process is also considered, including the new layer activation and time-dependent parameters. These constitute a complete scheme for 3DPC buildability modeling, which is then verified by two case studies with experimental results. The experimental and computational results exhibit plastic flow and/or elastic buckling. The case studies indicate that the proposed model can satisfactorily reproduce both the deformation shape and failure mode of 3DPC, thus providing guidance for the design of 3D concrete printing processes.