Publicação: Use of slag/sugar cane bagasse ash (SCBA) blends in the production of alkali-activated materials
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Blast furnace slag (BFS)/sugar cane bagasse ash (SCBA) blends were assessed for the production of alkali-activated pastes and mortars. SCBA was collected from a lagoon in which wastes from a sugar cane industry were poured. After previous dry and grinding processes, SCBA was chemically characterized: it had a large percentage of organic matter (ca. 25%). Solutions of sodium hydroxide and sodium silicate were used as activating reagents. Different BFS/SCBA mixtures were studied, replacing part of the BFS by SCBA from 0 to 40% by weight. The mechanical strength of mortar was measured, obtaining values about 60 MPa of compressive strength for BFS/SCBA systems after 270 days of curing at 20 °C. Also, microstructural properties were assessed by means of SEM, TGA, XRD, pH, electrical conductivity, FTIR spectroscopy and MIP. Results showed a good stability of matrices developed by means of alkali-activation. It was demonstrated that sugar cane bagasse ash is an interesting source for preparing alkali-activated binders. © 2013 by the authors; licensee MDPI, Basel, Switzerland.
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Alkali-activation, Microstructure, Slag replacement, Strength development, Sugar cane bagasse ash, Waste valorization, Activating reagents, Alkali activation, Alkali-activated binder, Electrical conductivity, Micro-structural properties, Sugar cane bagasse ashes, Waste valorizations, Blast furnaces, Compressive strength, Electric properties, Fourier transform infrared spectroscopy, Mortar, Silicon compounds, Slags, Sugar cane, Binders
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Materials, v. 6, n. 8, p. 3108-3127, 2013.
