Alternative Solid Activators from Waste Glass for One-Part Alkali-Activated Fly Ash/Red Mud Cements

• Published in: Materials Vol. 16; no. 20; p. 6707
• Main Authors: Marin, Nicolaie, Orbeci, Cristina, Bobiricǎ, Liliana, Rău, Ileana, Deleanu, Calin, Bîru, Elena Iuliana, Stănescu, Paul Octavian, Berbecaru, Andrei Constantin, Matei, Ecaterina, Bobiricǎ, Constantin
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.10.2023; MDPI
• Subjects: alkali fusion; Aluminum compounds; Biomass; Carbon footprint; Caustic soda; Cement; Cements; Compressive strength; Fly ash; Fourier transforms; Hydroxides; Industrial wastes; Manufacturing; Mass ratios; NMR; Nuclear magnetic resonance; one-part alkali-activated materials; Particle size; Potassium; Red mud; Silica; Sodium; Sodium hydroxide; solid activators; Steel production; Synthesis; waste glass; Romania; United States > US
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma16206707

Solid activators based on waste glass for the manufacture of one-part alkali-activated fly ash/red mud materials were synthesized, characterized, and tested in this work. The synthesis was carried out via alkaline fusion with sodium hydroxide at different reaction temperatures and at different sodium hydroxide/waste glass mass ratios. The results showed that the reaction temperature decisively influences the properties of the obtained solid activators. Thus, the best results regarding the water solubility of solid activators were obtained for the synthesis temperature of 600 °C, regardless of the sodium hydroxide/waste glass mass ratio. Also, the use of these assortments of solid activators led to obtaining the best compressive strength of one-part alkali-activated fly ash/red mud materials. The best results were obtained for the solid activator synthesized at a temperature of 600 °C and a sodium hydroxide/glass waste mass ratio of two.