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Materials 2013, 6(8), 3108-3127; doi:10.3390/ma6083108
Article

Use of Slag/Sugar Cane Bagasse Ash (SCBA) Blends in the Production of Alkali-Activated Materials

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1 UNESP–Univ Estadual Paulista, Campus de Ilha Solteira, Alameda Bahia 550, Ilha Solteira-SP CEP:15385-000, Brazil 2 Instituto de Ciencia y Tecnología del Hormigón, Universitat Politècnica de València, Camino de Vera s/n, Edificio 4G, Valencia 46022, Spain
* Author to whom correspondence should be addressed.
Received: 28 March 2013 / Revised: 22 May 2013 / Accepted: 24 May 2013 / Published: 25 July 2013
(This article belongs to the Special Issue Geopolymers and Geopolymeric Materials)
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Abstract

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.
Keywords: alkali-activation; sugar cane bagasse ash; slag replacement; waste valorization; microstructure; strength development alkali-activation; sugar cane bagasse ash; slag replacement; waste valorization; microstructure; strength development
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Castaldelli, V.N.; Akasaki, J.L.; Melges, J.L.; Tashima, M.M.; Soriano, L.; Borrachero, M.V.; Monzó, J.; Payá, J. Use of Slag/Sugar Cane Bagasse Ash (SCBA) Blends in the Production of Alkali-Activated Materials. Materials 2013, 6, 3108-3127.

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