Research Progress in Corrosion Mechanism of Reinforced Alkali-Activated Concrete Structures

Zhang, Feng; Xi, Xun; Yang, Shangtong

doi:10.3390/cmd2040034

Cited by 4 publications

(2 citation statements)

References 102 publications

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“…However, using these two values will lead to underestimation of the corrosion current density compared with the calculated B value, which is consistent with previous paper (Babaee and Castel, 2016). More details can be found in the author's previous paper (Zhang et al, 2021).…”

Section: Half-cell Potential and Tafel Constant Of Aacsupporting

confidence: 88%

Corrosion Mechanisms of Reinforced Alkali-Activated Concrete

Zhang,

Yang

2023

16th International Conference on Durability of Building Materials and Components

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Alkali-activated concrete (AAC), which exhibits good mechanical strength and chemical resistance properties, has attracted emerging interest from the research perspective considering the sustainable development of construction materials. However, the corrosion mechanism at the steel-AAC interface is not yet well understood including the physical and chemical aspects, which leads to different accumulation and evaluation of corrosion products, compared to ordinary Portland cement (OPC) concrete. In this paper, concrete pull-out test and electrochemical techniques were used to investigate the bond-slip behaviour and the evolution of deterioration of AAC respectively. In addition, the current guidance of corrosion evaluation used for OPC concrete based on ASTM C876 is not suitable for AAC. Five mixed ratios of blended fly ash and slag AAC were investigated under two chloride environments and one non-chloride environment, i.e., (1) 3.5% NaCl salt fog spray in the environmental chamber; (2) 3.5% NaCl saltwater immersion; (3) tap water immersion. Electrochemical techniques include half-cell potential, linear polarization resistance and Tafel extrapolation method were used to determine the corrosion rate. The electrochemical results are validated through the comparison of the gravimetric loss of steel after corrosion and electrochemical loss from calculation.

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Section: Half-cell Potential and Tafel Constant Of Aacsupporting

confidence: 88%

Corrosion Mechanisms of Reinforced Alkali-Activated Concrete

Zhang,

Yang

2023

16th International Conference on Durability of Building Materials and Components

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“…The per-year cement output is 3.1 BT/year, and this amount is expected to increase by 4 billion tons /yr [2]. Furthermore, by 2050, global cement consumption is expected to reach 5.5 gigatonnes/yr [3]. Cement manufacturing emits carbon dioxide (CO2), which contributes to global warming.…”

Section: Introductionmentioning

confidence: 99%

Durability Study on the Red mud-based Ternary Blended Geopolymer Concrete

Chakrapani

Ramesh

Potharaju

2022

Technium EcoGeoMarine

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Concrete made with geopolymer technology is thought to be both pro-ecological and minimal cost-effective. Geopolymer concrete manufacture aids in the conversion of industrial by-product materials into reusable products. Geopolymer concrete outperforms OPC concrete in terms of strength. The ternary blended high-molarities (12M) geopolymer concrete used in this experiment was made of red mud (RM), fly ash (FA), and Ground granulated blast furnace slag (GGBFS). The current study intended to establish the best ratio of RM - FA - GGBFS -based ternary geopolymer concrete. The compressive strength, split tensile strength, and flexural strength tests were performed to determine the strength properties and water absorption, permeability, and sorptivity tests determined the durability characteristics. The results showes that the proportions of RM-based ternary GPC with RM: FA:GGBFS in 45:35:20 ratio resulted in a significant increase in the synthesis. This resulting in improved mechanical and microstructural properties than the other proportions. Higher results were also seen at the aforementioned ratio in the chemical analysis performed on the ternary-based geopolymer paste to determine the maximum pH value. The study's findings are encouraging sustainable and cost-effective routes for dealing with the industrial by-products that are presently produced in multiple regions.

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