Recycling waste glass powder in lightweight aggregate concrete: Towards lightweight, sustainable and durable marine engineering structures

This study investigates the feasibility of incorporating waste glass powder (GP) as a sustainable supplementary cementitious material in structural lightweight aggregate concrete (SLAC) for marine applications. The effects of GP replacement (0–40%) on the fresh, mechanical, and durability properties were evaluated. Results showed that while GP reduces early-age strength, long-term mechanical stability is maintained, with GP20 achieving the highest elastic modulus. GP incorporation significantly improves durability, including reduced chloride migration, lower water absorption, and higher electrical resistivity. Corrosion resistance of steel bars under chloride exposure was enhanced, as indicated by higher open-circuit potential values (OCP). Microstructural analysis revealed that GP refines the pore structure and densifies the aggregate–matrix interface. These findings support the use of GP in producing low-carbon, durable SLAC for marine infrastructure.