A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Mechanical and environmental behavior of waste foundry sand stabilized with alkali-activated sugar cane bagasse ash-eggshell lime binder
Highlights Use of an industrial by-product and two agro-industrial wastes. WFS-AAB presented satisfactory strength, stiffness and durability. Cementing gel mostly composed of N-ASH, with a homogeneous and dense microstructure. The WFS-AAB matrix encapsulated Cd, Cr, Mn, Pb, and Zn from wastes and showed no metal toxicity. Alkali-activated SCBA-HEL binder can replace Portland cement to stabilize WFS.
Abstract This study evaluated the stabilization of waste foundry sand (WFS) with an alkali-activated binder (AAB) produced from sugar cane bagasse ash, hydrated eggshell lime, and sodium hydroxide. WFS-Portland cement (PC) mixtures entailed a control group. Strength, stiffness, accumulated loss of mass (ALM), microstructure, and leaching of metals were evaluated. WFS-AAB showed mechanical results similar or superior to WFS-PC, reaching 9.8 MPa after 28 days at 40 °C. Specimens with higher strengths showed higher initial stiffness, ALM around 7 %, and more homogeneous and compact matrices. N-ASH gel were identified in WFS-AAB. WFS-AAB mixtures encapsulated Cd, Cr, Mn, Pb, and Zn from wastes.
Mechanical and environmental behavior of waste foundry sand stabilized with alkali-activated sugar cane bagasse ash-eggshell lime binder
Highlights Use of an industrial by-product and two agro-industrial wastes. WFS-AAB presented satisfactory strength, stiffness and durability. Cementing gel mostly composed of N-ASH, with a homogeneous and dense microstructure. The WFS-AAB matrix encapsulated Cd, Cr, Mn, Pb, and Zn from wastes and showed no metal toxicity. Alkali-activated SCBA-HEL binder can replace Portland cement to stabilize WFS.
Abstract This study evaluated the stabilization of waste foundry sand (WFS) with an alkali-activated binder (AAB) produced from sugar cane bagasse ash, hydrated eggshell lime, and sodium hydroxide. WFS-Portland cement (PC) mixtures entailed a control group. Strength, stiffness, accumulated loss of mass (ALM), microstructure, and leaching of metals were evaluated. WFS-AAB showed mechanical results similar or superior to WFS-PC, reaching 9.8 MPa after 28 days at 40 °C. Specimens with higher strengths showed higher initial stiffness, ALM around 7 %, and more homogeneous and compact matrices. N-ASH gel were identified in WFS-AAB. WFS-AAB mixtures encapsulated Cd, Cr, Mn, Pb, and Zn from wastes.
Mechanical and environmental behavior of waste foundry sand stabilized with alkali-activated sugar cane bagasse ash-eggshell lime binder
Ferrazzo, Suéllen Tonatto (author) / Araújo, Mariana Tonini de (author) / Bruschi, Giovani Jordi (author) / Chaves, Helder Mansur (author) / Korf, Eduardo Pavan (author) / Consoli, Nilo Cesar (author)
2023-04-04
Article (Journal)
Electronic Resource
English
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