3D printable lightweight cementitious composites with incorporated waste glass aggregates and expanded microspheres – Rheological, thermal and mechanical properties

One of the fields in construction industry where 3D printing cementitious composites can play a significant role is associated with manufacturing lightweight structures. Thanks to printing, structural self-weight be reduced by topology optimization printed elements. Moreover, further decrements and improvement thermal insulating properties achieved mixture design introduction materials low conductivity. To date, limited knowledge on printable mixtures available. The main objective this study develop concrete (3DPLWC) mixture, intention replacing natural aggregate waste glass (WG) 50 vol.-% 100 vol.-%. expanded thermoplastic microspheres (ETM) were incorporated into mixture. This led reduction density as well conductivity up 40%. Comprehensive evaluation material's fresh revealed that addition ETM results material lower yield shear stress higher plastic viscosity 28% 66%, respectively, compared mixes without ETM. shape retention, flowability, setting times, early-hardened mixtures' was observed. mechanical 3DPLWC showed replacement WG enhanced flexural compressive strength composite, while full resulted retaining or slight properties.