Abstract In this paper, Injection 3D Concrete Printing (I3DCP), a novel 3D concrete printing technology, is presented. I3DCP comprises ‐ in the presented “Concrete in Suspension” variant ‐ the injection of concrete into a non‐hardening carrier liquid (limestone powder suspension). In contrast to “conventional” 3D concrete printing, I3DCP enables the fabrication of lightweight and modular components through printing spatially free trajectories. Within this paper, the current status of research in terms of structural design, modularization, material‐process interaction and reinforcement integration of this technology is presented. Selected results on the effect of rheology on the quality of nodes and on the relevance when encasing reinforcement are presented and discussed.
Mai et al. (2026) studied this question.