Development of Lightweight Geopolymer Composites by Combining Various CDW Streams

This study regards the development of lightweight geopolymer composites through valorization various construction and demolition wastes. Brick waste was utilized as sole aluminosilicate precursor for geopolymerization reactions, expanded polystyrene polyurethane wastes were used artificial aggregates, short polyethylene fibers developed from CDWs reinforced matrix. The curing conditions synthesis optimized to deliver a robust matrix (T = 25–80 °C, t 24–72 h). Both raw materials products appropriately characterized with XRD SEM, while mechanical performance tested compressive strength, flexural Poisson’s ratio Young’s modulus measurements. Then, comprehensive durability investigation performed (sorptivity, wet/dry cycles, freeze/thaw exposure real weather conditions). In contrast waste, introduction (0.5–3.0% wt.) effectively reduced final density (from 2.1 1.0 g/cm3) by keeping sufficient strength (6.5–22.8 MPa). PE could enhance bending behavior geopolymers 24%; however, matrix–fiber debonding clearly visible SEM analysis. Finally, CDW-based significantly improved after incorporation aggregates mainly concerning testing. composite containing 1.5% wt. 2.0% v/v held best combination properties: Compr. Str. 13.1 MPa, Flex. 3.2 1.4 g/cm3, 1.3 GPa, sorptivity 0.179 mm/min0.5.