Keywords
acids
geopolymers
mechanical properties
chemical resistance
sulfates ácidos
ceniza volante
geopolimeros
propiedades mecánicas
resistencia química
sulfatos
geopolymers
mechanical properties
chemical resistance
sulfates ácidos
ceniza volante
geopolimeros
propiedades mecánicas
resistencia química
sulfatos
How to Cite
Valencia-Saavedra, W. G., Angulo-Ramírez, D. E., & Mejia de Gutiérrez, R. (2018). Chemical resistance of alkali-activated fly ash/slag concrete: sulfates and acids. Informador Tecnico, 82(1), 67–77. https://doi.org/10.23850/22565035.1351
Abstract
One of the most important features of concrete, in addition to its mechanical properties, is its durability, which is associated to the in-service life of structures exposed to certain conditions or environments; this property is required to define the potential application fields and facilitate the commercialization of new cementing materials. In this study, the chemical resistance of a concrete based on a binary mixture of fly ash (FA) and blast furnace slag (GBFS) in an 80/20 ratio was evaluated. A concrete based on Portland cement (OPC) was used as a reference material. The compressive strength of Geo FA/GBFS at 28 days cured at room temperature was 42.9 MPa, 26% higher than that reported by the OPC concrete. Geo FA/GBFS exposed to sulfates does not show expansion, and the loss of compressive strength at 180 days aged of exposure was not significant (2%) compared to OPC concrete (39%). In the case of exposure to acids, FA/GBFS had a loss of resistance of 39% and OPC of up to 70%. These characteristics show the best performance of the activated material and its potential use in aggressive environments.
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