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.
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