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Open AccessFeature PaperArticle

Effect of Vietnamese Fly Ash on Selected Physical Properties, Durability and Probability of Corrosion of Steel in Concrete

1
Department of Civil Engineering, The University of Danang-University of Science and Technology, 54 Nguyen Luong Bang, Danang, Vietnam
2
Materials and Corrosion Technology, Mott MacDonald, Altrincham WA14 1ES, UK
*
Author to whom correspondence should be addressed.
Materials 2019, 12(4), 593; https://doi.org/10.3390/ma12040593
Received: 10 January 2019 / Revised: 7 February 2019 / Accepted: 13 February 2019 / Published: 16 February 2019
(This article belongs to the Special Issue Corrosion of Reinforcing Steel in Reinforced Concrete)
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Abstract

Vietnamese fly ash was used as a partial replacement for ordinary Portland cement in the proportions of 10%, 20% and 40%, while the water to cementitious ratios were kept constant at 0.42, 0.5 and 0.55, respectively, for three groups. The compressive strengths of all mixes were determined up to 90 days. The acid resistance of fly ash concrete was examined by the mass loss and compressive strength loss of 100 × 100 × 100 mm3 cubes immersed in a 10% H2SO4 solution. The probability of steel corrosion in the fly ash concrete was assessed by measuring the half-cell potentials of steel bars within beams dimensions of 100 × 100 × 500 mm3, and the flexural strengths of these beams after 300 days of immersion in a 5% NaCl solution were determined. The results demonstrate that the compressive strength of fly ash concrete is reduced at an early age but increases as the concrete continues to hydrate. The fly ash increases the sulfuric acid resistance of concrete. Fly ash additions have only a limited effect on reducing the risk of probability of corrosion of steel in the concrete. The load capacities of 10% and 20% fly ash reinforced concrete beams are higher than that of the control beams after 300 days immersed in a 5% NaCl solution. View Full-Text
Keywords: concrete; fly ash; workability; compressive strength; acid resistance; probability of corrosion concrete; fly ash; workability; compressive strength; acid resistance; probability of corrosion
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Van Nguyen, C.; Lambert, P.; Hung Tran, Q. Effect of Vietnamese Fly Ash on Selected Physical Properties, Durability and Probability of Corrosion of Steel in Concrete. Materials 2019, 12, 593.

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