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Published on: February 21, 2017
Mechanical and microstructural properties of iron mining tailings stabilized with alkali-activated binder produced
William Mateus Kubiaki Levandoski1, Suéllen Tonatto Ferrazzo2, Giovani Jordi Bruschi2
1Graduate Program in Environmental Science and Technology, Universidade Federal da Fronteira Sul, Erechim, RS, 99700-970, Brazil.
Abstract:
This study evaluated the stabilization of iron ore tailings (IOTs) with an alkali-activated binder (AAB) produced from sugar cane bagasse ash, hydrated eggshell lime, and sodium hydroxide solution. Unconfined compressive strength, split tensile strength, initial shear stiffness, mineralogy, chemical composition, and microstructure of IOTs-AAB were evaluated. Strength values up to 6.59 MPa were achieved after 28 days-curing at 40 °C. Reducing porosity and increasing the binder content improved the overall mechanical behavior. N-A-S-H like gels were identified in IOTs-AAB mixtures. Finally, longer curing times led to more compact structures.
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