Properties of different particle size of recycled TFT-LCD waste glass powder as a cement concrete binder

Abstract

In the high-tech industry in Korea, the use of thin-film transistor liquid-crystal display (TFT-LCD) glass products has increased significantly in recent years and large amounts of TFT-LCD waste glass are produced during the manufacturing process. The use of recycled waste glass in Portland cement and concrete has attracted a lot of interest worldwide due to environmental concerns, and the increased cost of disposing of used glass. This research studied the effect of different particle size of grinding TFT-LCD waste glass proportions on binder in cement mortar. Experiments were conducted to determine the optimal replacement content and particle type to ensure that the quality of concrete products is maintained. The results indicate that the use of TFT-LCD waste glass powder as an admixture for cement mortar was efficient in reducing alkali–silica reaction (ASR) expansion and increasing workability. The compressive strength of mortars with TFT-LCD waste glass was also improved compared with that of normal mortar, due to the increased amount of calcium silicate hydrates created by pozzolanic reaction. But it was apparent that the properties of workability, compressive strength and ASR were different significantly with particle size of TFT-LCD waste glass powder.