Journal ArticleDOI
Examination of Chloride-Induced Corrosion in Reinforced Geopolymer Concretes
TLDR
In this article, the durability of steel reinforced-concrete specimens made from three alkali-activated fly ash (FA) stockpiles and ordinary portland cement (OPC) in cyclic wet-dry chloride environment was evaluated over a period of 12 months.Abstract:
The durability of steel reinforced-concrete specimens made from three alkali-activated fly ash (FA) stockpiles and ordinary portland cement (OPC) in cyclic wet-dry chloride environment was evaluated over a period of 12 months. Testing methods included electrochemical methods, chloride diffusion and contents analysis, chemical and mechanical analyses, and visual examination. Geopolymer concrete (GPC) specimens made from Class F FA exhibited lower diffusion coefficients, chloride contents, and porosity compared with their GPC Class C FA and OPC counterparts. Overall, GPC specimens displayed limited signs of leaching and corrosion product formation, whereas OPC specimens exhibited the formation of multiple corrosion products along with significant leaching.read more
Citations
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Journal ArticleDOI
Durability of Alkali‐Activated Materials: Progress and Perspectives
Susan A. Bernal,John L. Provis +1 more
TL;DR: In this article, the authors present an overview of the results obtained when AAMs are exposed to aggressive testing conditions such as elevated concentrations of CO2, sulfates or chlorides.
Journal ArticleDOI
Durability of alkali-activated materials in aggressive environments: A review on recent studies
TL;DR: In this paper, the authors reviewed factors influencing water absorption and permeability of AAMs, effect of gel composition and exposure environments on carbonation, chloride penetration, and chloride migration test methods, and sulfate resistance in high-calcium and lowcalcium alkali-activated systems.
Journal ArticleDOI
A Review on the Durability of Alkali-Activated Fly Ash/Slag Systems: Advances, Issues, and Perspectives
TL;DR: In this article, the authors provide an overview of the latest developments on durability of fly ash/slag-based AAMs with the aim to update recent findings regarding their behavior under aggressive conditions (sulfates, freeze-thaw, chloride, carbonation, acid, efflorescence).
Journal ArticleDOI
Corrosion of steel bars induced by accelerated carbonation in low and high calcium fly ash geopolymer concretes
TL;DR: In this paper, reinforced geopolymer concretes with fly ashes having reduced calcium content are more suitable for the production of durable concrete for structural applications under exposure to carbonating environments, as the properties of these materials seem to mitigate the risk of carbonationinduced reinforcement corrosion in concrete.
Journal ArticleDOI
Chloride ingress and steel corrosion in geopolymer concrete based on long term tests
TL;DR: In this paper, the authors explored the chloride permeability and initiation of chloride induced corrosion of geopolymer concrete in accelerated chloride environment using longer test period, and showed that the apparent chloride diffusion coefficient of blended fly ash and slag-based concrete is lower than that of OPC concrete.
References
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Book
The iron oxides: structure, properties, reactions, occurrences and uses.
R. M. Cornell,Udo Schwertmann +1 more
TL;DR: In this article, the authors introduce the concept of iron oxides and their properties, including surface chemistry and Colloidal stability, as well as their properties in terms of surface area and porosity.
Journal ArticleDOI
Geopolymer technology: the current state of the art
Peter Duxson,Ana Fernández-Jiménez,John L. Provis,Grant C. Lukey,Ángel Palomo,J.S.J. van Deventer +5 more
TL;DR: A brief history and review of geopolymer technology is presented with the aim of introducing the technology and the vast categories of materials that may be synthesized by alkali activation of aluminosilicates as mentioned in this paper.
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Corrosion of Steel in Concrete: Understanding, investigation and repair
TL;DR: In this paper, the authors present a survey and assessment methodology for corrosion assessment of reinforced concrete, including a detailed survey of available techniques for inspection and characterization of steel in concrete.
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Geopolymers : structure, processing, properties and industrial applications
TL;DR: In this article, the authors describe the synthesis and characterization of fly ash glass chemistry and inorganic polymer cements for geopolymers and their application in nuclear waste immobilization and toxic waste removal.