Suitability of liquid crystal display (LCD) glass waste as supplementary cementing material (SCM): Assessment based on strength, porosity, and durability

Abstract The use of pozzolanic waste materials as partial cement replacement is customary in contemporary concretes from a sustainability perspective. In this experimental study, the liquid crystal display (LCD) glass waste was finely ground to be used as SCM, and the potential beneficial effects in terms of strength, hydration, and durability of resulting concretes were evaluated. Concretes with 10% and 20% cement replacement by LCD glass waste powder (LCDGP) were developed and subsequently tested at various ages. It is shown that LCDGP can be successfully used as supplementary cementing material (SCM) in developing sustainable and low embodied energy concrete. The pozzolanic reactivity of LCDGP is corroborated, which has been found limited for coarser particles. Although the modified concretes exhibited lower early-age strength than the normal concrete, the mechanical properties at later ages indicated at least 5% better performance due to the pozzolanic reactivity, greater surface area, and finer particle size of LCDGP. LCDGP also proved to be very effective in improving the freezing-thawing resistance and sulfate attack of modified concretes by up to 30% and 5%, respectively. In conclusion, LCDGP is excellent in improving concrete durability and strength while also promoting sustainable development.