Elucidating the effects of nanosilica on the characteristics of alkali-activated thin-film transistor liquid-crystal display waste glass

Kang Gao1, Kae-Long Lin2, Chao-Lung Hwang3, Bui Le Anh Tuan4, Ta-Wui Cheng5, DeYing Wang1

1 Department of Environmental and Material Engineering, Yan-Tai University, Yan-Tai, China
2 Department of Environmental Engineering, National Ilan University, Ilan City,Taiwan
3 Department of Construction Engineering, National Taiwan University of Science and Technology, Taipei City, Taiwan
4 Department of Civil Engineering, Can Tho University, Can Tho City, Viet Nam
5 Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, Taipei City,Taiwan


Thin-film transistor liquid-crystal display (TFT-LCD) waste glass can be used as a raw material for producing geopolymers, because it contains large amounts of silicon and aluminum in its amorphous structure. The setting time and compressive strength were evaluated to determine the quality of the geopolymer product with various amounts of nano-SiO2 (0% 3%) and TFT-LCD waste glass replacement (0% - 40%). The microstructures of the samples were characterized using mercury intrusion porosimetry (MIP), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The highest compressive strength and compact microstructure of the geopolymer was attained by adding 10% waste glass and 1% nano-SiO2. The results demonstrated that adding nano-SiO2 to the geopolymer substantially enhances compactness, improves uniformity, and greatly increases compressive strength. This work offers a low-cost route for fabricating geopolymers, because TFT-LCD waste glass can be used to partially substitute metakaolin in the composition of the geopolymer.


compressive strength; geopolymer; microstructure; nano-SiO2; TFT-LCD waste glass

Full Text:

 Subscribers Only