Compressive, flexural and corrosion permeability resistance properties of concrete with bauxite tailing as supplementary mineral admixtures
Compressive, flexural and corrosion permeability resistance properties of concrete with bauxite tailing as supplementary mineral admixtures
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Date
2022
Authors
Yalley, Paa Kofi Peter
K. Kankam, Charles
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Publisher
Scientific African 18 (2022)
Abstract
This paper investigates the compressive and flexural properties and corrosion permeabil ity resistance of concrete, using bauxite tailing as supplementary mineral admixtures. The
concrete mixes, curing and testing for mechanical properties were conducted in accordance
with BS EN 12390, 2019. Chloride permeability test was conducted in accordance with
ASTMC 1202, 1997. The results depicted that at the optimum composition of 20% replace ment, the compressive strength, flexural strength and static modulus of elasticity increased
by 22%, 28% and 13% respectively over the control concrete specimen. These results showed
that, generally, there was an increase in the strength properties and subsequently the mod ulus of elasticity when cement was replaced with bauxite tailing at the latter age. Again
the presence of silicate and aluminum in the bauxite tailing might have consumed Ca(OH)2
which was liberated from cement hydration, enriching the microstructure of the concrete
(AS2 +3CH+6H=C2ASH8 +C-S-H) with C-S-H gel and crystalline calcium alumino-silicate
(C2ASH8) at the latter age than at the earlier age. The mixes with bauxite tailing replace ment had low permeability and very low chloride penetration as compared to the control
concrete specimen. This study recommends that bauxite tailing should be used as a min eral admixture to concrete not exceeding 20% replacement and in a chloride environment.
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Citation
Yalley, P. P., & Kankam, C. K. (2022). Compressive, flexural and corrosion permeability resistance properties of concrete with bauxite tailing as supplementary mineral admixtures. Scientific African, 18, e01409.