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Title: Valorization of waste perlite powder in geopolymer composites
Authors: El-Mir, Abdulkader 
Hwalla, Joud
El-Hassan, Hilal
Assaad, Joseph 
El-Dieb, Amr
Shehab, Ehab
Affiliations: Department of Civil and Environmental Engineering 
Department of Civil and Environmental Engineering 
Keywords: Blast furnace slag
Geopolymer mortar
Performance evaluation
Waste perlite powder
Issue Date: 2023-03-03
Publisher: Elsevier
Part of: Construction and Building Materials
Volume: 368
The utilization of industrial waste by-products including blast furnace slag (BFS) for geopolymer (GP) production gained considerable attention in recent years. Yet, the development, characterization, and optimization of this kind of material in the presence of waste perlite powder (WPP) has not been investigated. This study assesses the effect of binder content, WPP replacement rate, alkaline activator-to-binder ratio (s/b), and sodium silicate-to-sodium hydroxide ratio (S/H) on the fresh, mechanical, and durability performance of GP mortars blended with BFS and WPP precursors. The optimum proportions determined using the multicriteria Taguchi method were found to contain 600 kg/m3 binder content, 25 % WPP replacement rate, 0.60 s/b, and 2.0 S/H. The reaction kinetics and morphology of precipitated compounds, including the scanning electron microscopy and energy dispersive X-ray analysis, highlighted the rate of activating the calcium aluminosilicate gels and dense microstructure of the optimum mixture. Such data can be of particular interest to researchers and engineers seeking to valorize the use of industrial wastes in GP applications.
ISSN: 09500618
DOI: 10.1016/j.conbuildmat.2023.130491
Ezproxy URL: Link to full text
Type: Journal Article
Appears in Collections:Department of Civil and Environmental Engineering

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