Development of cement-based mortars for 3D printing through wet extrusion

Abstract

<p>The construction sector is connoted as an extremely traditional business sector since long ago. However, due to the increase of the global competiveness, there is a demand on the development of new building materials and construction methods that can bring added value to the companies. The 3D concrete printing is a novel construction approach within digital construction that can offer a higher degree of optimization and flexibility for producing either structures or structural elements with complex geometries. One of the main challenges in the 3D concrete printing using wet extrusion is balancing properly the rheological and mechanical properties of the printable mixtures. In this study, several mixtures were developed and their capability for being used in 3D printing was assessed and discussed based on their rheological properties. The compressive strength of the matrices that could be properly printed are also presented.</p>

Development of Photocatalytic 3D-Printed Cementitious Mortars: Influence of the Curing, Spraying Time Gaps and TiO2 Coating Rates

“…The mixture composition was defined in previous experimental works regarding the development and characterization of the mechanical behaviour of ternary cementitious mortars for 3D concrete printing [28,36]. Table 1 includes the constituents used in the selected mortar composition.…”

AM Perspectives: Research in additive manufacturing for architecture and construction

“…For instance, the right fluidity for pumping and extrusion without blockages is needed but if it's too fluid, the printed filaments will be weak and structure could sag or collapse. According to Zahabizadeh et al (2019) [12] one of the main challenges of 3DPC is also the rheological and mechanical balance of the printable mixtures in the fresh and hardened state, which depends heavily on the material, method, geometry and machine settings.…”

Photocatalysis of functionalised 3D printed cementitious materials

“…Table 2 includes the mortar composition per cubic meter and specific mass of its constituents, while Table 3 resumes the main mechanical and physical properties at the curing age of 28 days. A comprehensive description of the development process and characterisation of the mechanical properties of this composition can be found elsewhere [33,34].…”

“…In this study, semiconductor particles were coated on a cementitious matrix for 3DCP developed in a previous experimental work [33,34]. Fig.…”