Use of slag/sugar cane bagasse ash (SCBA) blends in the production of alkali-activated materials

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...

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Detalles Bibliográficos
Autores: Castaldelli, Vinícius N. [UNESP], Akasaki, Jorge L. [UNESP], Melges, José L.P. [UNESP], Tashima, Mauro M. [UNESP], Soriano, Lourdes, Borrachero, María V., Monzó, José, Payá, Jordi
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2013
País:Brasil
Institución:Universidade Estadual Paulista (UNESP)
Repositorio:Repositório Institucional da UNESP
Idioma:inglés
OAI Identifier:oai:repositorio.unesp.br:11449/76266
Acceso en línea:http://dx.doi.org/10.3390/ma6083108
http://hdl.handle.net/11449/76266
Access Level:acceso abierto
Palabra clave: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
Descripción
Sumario: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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