3D printing as an automated manufacturing method for a carbon fiber-reinforced cementitious composite with outstanding flexural strength (105 N/mm2)

Abstract As research interest in the additive manufacturing of cementitious materials for structural uses has been continuously increasing, question how to incorporate tensile reinforcement an automated process gained further importance. Our describes a carbon fiber-reinforced composite produced by common extrusion techniques applied 3D printing as means effectively control fiber alignment. Optimization mixture design and consistency allows admixing up 3 vol.-% chopped fibers, leading specimens that can reach flexural strength exceeding 100 N/mm 2 without addition continuous reinforcement. Fiber integrity during was checked using optical microscopy. Analysis microstructure shows approximately 70% fibers are aligned within ± 5° preferential direction. Micromechanical single-fiber push-out tests confirm interfacial fracture toughness typical strain-hardening systems. The first insights into ‘lost formwork’ approach commonly employed show remains effective even when combined with nonreinforced mortar.