Interface Bonding in 3D-Printed Concrete (2025-08)¶

3D Concrete Printing (3DCP) offers advantages such as eliminating formwork and reducing construction waste, but weak interfaces between printed layers remains a key challenge, compromising structural integrity and durability. This study evaluates bond strength at these interfaces through splitting tension tests on 150 mm³ cubes, simulating worst-case scenarios with a one-hour layer gap. Digital Image Correlation (DIC) is used to capture failure displacement. The resulting data will inform numerical simulations, where cohesive elements with a traction-separation material model represent the interfaces. The findings of this research will enhance understanding of interfaces and lead to improvements in the safety, durability, and performance of 3D-printed concrete structures.