Session: 16-01-04: Mechanical Performance III

Paper Number: 166732

Evaluating the Structural Strength of Layered Concrete Reinforced With 3D-Welded Rebar 

The experimental application of 3D printing in concrete construction is progressing toward large-scale commercial implementation, offering innovative possibilities for the industry. One promising area of research is the integration of 3D-welded rebar, which has demonstrated potential for reinforcing 3D-printed concrete structures. Ideally, the co-deposition of concrete and rebar would create a well-integrated composite material, enhancing overall structural integrity. Previous studies indicate that 3D-printed rebar retains at least 60% of the strength of conventional rebar. Likewise, the bending strength of concrete beams reinforced with 3D-printed rebar, particularly when placed at the bottom of the beam, has been found to be approximately 60% of traditionally reinforced beams. However, these studies used conventional beam fabrication methods, where concrete was poured into a mold around the rebar, rather than fully utilizing 3D printing technology.

While small, single-story 3D-printed houses—sporadically constructed in various countries—may not require exceptionally high tensile strength, the same cannot be said for large-scale infrastructure projects. Multistory buildings, bridges, and skyscrapers must endure substantial dynamic forces, including wind loads and seismic activity. As a result, high-tensile-strength reinforcement materials, such as steel rebar, remain essential for ensuring structural safety. The combination of 3D-printed concrete, which alters traditional material properties, with 3D-welded rebar, which affects tensile strength, presents unique challenges in achieving the same level of reliability as conventional construction methods. Ensuring that 3D-printed concrete structures can withstand real-world forces requires a thorough evaluation of these materials’ mechanical performance.

This study investigates the structural strength of concrete beams reinforced with both 3D-welded and conventional rebar while utilizing 3D-printed concrete. A specialized concrete 3D printer will be employed for precise material deposition, while a MIG welder torch will be programmed to fabricate rebar using additive manufacturing techniques. Mechanical tests will be conducted to assess the bending strength of the beams, and the results will be compared to conventionally reinforced concrete beams of the same dimensions. Additionally, beams created using a combination of 3D-printed concrete and 3D-welded rebar will be evaluated alongside traditionally cast beams that incorporate 3D-printed rebar.

By systematically analyzing these results, this research aims to determine the feasibility and reliability of 3D printing in reinforced concrete construction. The findings will provide valuable insight into whether 3D-printed concrete—combined with either conventional or 3D-welded rebar—can meet the structural performance standards required for widespread adoption in commercial construction. If successful, this technology could revolutionize the construction industry by enabling faster, more cost-effective, and sustainable building solutions while maintaining structural integrity

Presenting Author: Seyed Allameh nku

Presenting Author Biography: Dr. Seyed Allameh joined NKU in 2004 after serving as Research Staff at Princeton University, where he worked on advanced materials, microelectromechanical systems, and nanotechnology. Before that, as a research associate at The OSU, he focused on advanced electronic ceramics, including high-temperature superconductors. He earned his doctorate from The OSU, specializing in the energy and structure of crystalline interfaces. At NKU, his research centered on biomimicry, micromechanics, and alternative energy. He was the recipient of the NKU’s 2017 Excellence in Research, Scholarship, and Creative Activity Award. Currently, his work focuses on the mechanical properties of 3D-printed reinforced concrete structures.

Authors:

Seyed M. Allameh nku
Roger Miller Northern Kentucky University