| Summary: | This study explores the upcycling of glass waste into sustainable materials using additive manufacturing. The direct ink writing technique was used to 3D print structures from waste fiberglass activated with 3 M or 5 M NaOH. All inks showed shear-thinning behavior after 3 h of mixing, ensuring good printability. Printed structure with 5 M NaOH achieved higher compressive strength (5.2 MPa). Incorporation of glass microsphere fillers, synthesized from waste soda-lime glass via flame synthesis, improved print quality and reduced density. The printed structures displayed good layer adhesion and defect-free morphology. Thermal treatment at 800 °C produced porous glass ceramics with a foaming effect. Low molarity and microsphere incorporation minimized foaming while preserving the 3D structure. Final products had porosities of 88–93 %, bulk densities of 0.17–0.3 g/cm³, and compressive strengths of 1.6–3.2 MPa, demonstrating their potential as lightweight, sustainable building materials.
|
|---|
