Enhancing inter-layer bond in 3D concrete printing using topological design principle
Research on effect of topological interlocking in extrusion-based 3D printable concrete
N.P. Mithapelli (TU Delft - Civil Engineering & Geosciences)
B Šavija – Mentor (TU Delft - Materials and Environment)
Sandra Nunes – Graduation committee member (TU Delft - Concrete Structures)
H. R. Schipper – Coach (TU Delft - Applied Mechanics)
Anne L. van van Overmeir – Coach (TU Delft - Materials and Environment)
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Abstract
Conventional construction techniques are unsustainable and expensive due to longer construction time, labour-intensive work, and the use of formwork. 3D concrete printing is seen as a potential substitute to overcome these issues. However, extrusion-based 3D printed structures exhibit a weak interlayer bond, and researchers have tried to address this problem through techniques such as using cement mortar layers or vertical steel reinforcement between the layers. This study aims to address the problem of the weak interlayer bond by implementing the phenomenon of 'topological interlocking' to increase the mechanical interlocking between the layers. The study performed scale model printing in the form of mould-casting and caulk-gun extrusion to produce specimens to analyze the effect of grooving on interlayer bond strength. The results were counterintuitive to the previously observed research, and the study recommends avoiding issues that may interfere in further similar studies.