Chloride induced corrosion of steel reinforcement in alkali activated slag concretes: A critical review

Vu, Tran Huyen; Dang, Liet Chi; Kang, Gyeong-o; Sirivivatnanon, V.

doi:10.1016/j.cscm.2022.e01112

Cited by 15 publications

(10 citation statements)

References 74 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

Section: Influence Of Na 2 O% and Msmentioning

confidence: 80%

“…Similarly, as shown in Figure 4, with the increase in Na 2 O%, the AAS concretes at room temperature had a lower porosity as a result of sufficient reaction [25][26][27][28][29][30], therefore, indicates that these samples should have lower chloride permeability. However, the AAS concretes with more Na 2 O% yielded higher charge passed, indicating higher chloride permeability, as shown in Figure 5.…”

Section: Influence Of Na 2 O% and Msmentioning

confidence: 86%

See 1 more Smart Citation

Chloride Permeability of Alkali-Activated Slag Concretes after Exposure to High Temperatures

Zhou,

Ma,

Guo

et al. 2024

Materials

View full text Add to dashboard Cite

The number of fires in buildings and on bridges has increased worldwide in recent years. As a structural material, the strength of alkali-activated slag (AAS) concrete after exposure to high temperatures has been given much attention. However, research of its durability is still lacking, which limits the application of this type of concrete on a larger scale. In this context, as one of the most important aspects of durability, the chloride permeability of AAS concretes after exposure to high temperatures was examined in this study. The influence of the alkali concentration (Na2O%) and the modulus (Ms) of the activator, as well as the influence of heating regimes, including the heating rate, duration of exposure to the target temperature, and cooling method, was also discussed. The results show that the chloride permeability of the AAS concretes increased with temperature elevation. Due to the interference of pore solution conductivity, the influence of the Na2O% and the Ms of the activator on the chloride permeability of the AAS concretes was not made clear by using the ASTM C 1202 charge passed method; however, after exposure to high temperatures, AAS with a lower Na2O% and lower Ms has lower porosity and may have lower chloride permeability, which needs further investigation. Faster heating for a longer duration at the target temperature and water cooling reduced the resistance of the AAS concretes to chloride permeability as a result of their increased porosity.

show abstract

Section: Influence Of Na 2 O% and Msmentioning

confidence: 80%

Section: Influence Of Na 2 O% and Msmentioning

confidence: 86%

Chloride Permeability of Alkali-Activated Slag Concretes after Exposure to High Temperatures

Zhou,

Ma,

Guo

et al. 2024

Materials

View full text Add to dashboard Cite

show abstract

“…Fly ash improves the performance and workability of the mixture [34,35], while slag powder reduces the hydration heat within the concrete, reducing the chances of internal cracking. Combined with the crack resistance provided by steel fibers, the performance of the concrete is well preserved [36][37][38]. This suggests that the combined use of fly ash and slag powder is the best gel substitute material.…”

Section: Introductionmentioning

confidence: 94%

Properties of High-Content Micro-Steel Fiber Self-Compacting Concrete Incorporating Fly Ash and Slag Powder Performance Study

Yang,

Wang,

Zeng

et al. 2023

Construction Materials

View full text Add to dashboard Cite

The addition or substitution of various gel materials in cement-based composites has been proven to be an effective approach in enhancing the performance of concrete. Current research focuses mainly on enhancing the toughness of concrete, but lacks discussion on the performance of alternative gel materials. Therefore, this study aims to explore the effects of partially substituting cement with fly ash and slag powder as gel materials, while incorporating a high volume fraction of micro-steel fibers (6%), on the workability and mechanical properties of self-compacting concrete. By means of rigorous experimental investigation and meticulous analysis, we comprehensively assessed the workability characteristics of self-compacting concrete, encompassing critical aspects such as filling ability, cohesion, and permeability. Additionally, we conducted an extensive evaluation of the mechanical attributes of self-compacting concrete, encompassing vital parameters, such as compressive strength, axial compressive strength, splitting tensile strength, and flexural strength. Last but not least, through a holistic integration of workability and mechanical properties, we conducted a comprehensive performance evaluation of self-compacting concrete incorporating a synergistic blend of fly ash, slag powder, and micro steel fibers. The experimental results indicate that the composite addition of fly ash and slag powder in self-compacting concrete, while compatible with up to 6% micro-steel fibers, leads to a decrease in concrete workability and an increase in cohesiveness due to the addition of micro-steel fibers. Moreover, fly ash predominantly influences the tensile properties of concrete, while the addition of slag powder significantly affects the compressive and flexural properties of concrete. Additionally, the addition of micro-steel fibers significantly improves the overall mechanical properties of concrete.

show abstract

“…Chloride ion action may cause local passive film breakdown and corrosion on the casing steel [7][8][9]. The chloride threshold level that triggers the corrosion of casing steel can be defined as the minimum chloride ion content that promotes the decomposition of local passive film on the casing steel under highly alkaline conditions of the cement sheath [10][11][12][13]. Having an insignificant ionic radius and strong penetrability, chloride ions can penetrate the produced oxide film and reach the surface of the metal substrate.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Investigation of Chloride Ion-Induced Breakdown of Passive Film on P110 Casing Steel Surface in Simulated Pore Solution: Behavior and Critical Value Determination

Peng,

Lin,

Xia

et al. 2024

Metals

View full text Add to dashboard Cite

In the petroleum industry, the casing steel is fixed with a cement sheath to ensure reliable service in demanding conditions characterized by high temperature, high pressure, and exposure to multiple types of media. After the hydration of the cement, a porous material is produced with a highly alkaline solution filling the pores, commonly referred to as the pore solution. The casing will form a protective passive film when in contact with a highly alkaline pore solution. Nevertheless, once the cement sheath cracks, chloride ions in the stratum will pass through the cement sheath to the surface of the casing. When chloride ions accumulate to a certain concentration, the passive film will be destroyed, without exerting a protective influence on the substrate. After chloride ions come into direct contact with the casing, the casing is prone to severe failure due to corrosion perforation. The casing failure can cause a blowout outside the casing and even scrapping of the oil well. Controlling casing corrosion and ensuring casing integrity relies on understanding the critical chloride ion concentration that can cause the degradation of the passive film. Therefore, to assess the electrochemical properties and analyze the damage process of the passive film under varying chloride ion concentrations, several characterization techniques were employed. These included potential–time curves (E-t), polarization curves, electrochemical impedance spectroscopy (EIS), and Mott–Schottky curves. In addition, the composition of the passive film on the surface of the P110 casing steel was qualitatively analyzed using X-ray photoelectron spectroscopy (XPS). To further understand the surface morphology of the P110 casing steel, scanning electron microscopy (SEM) was used.

show abstract

Chloride induced corrosion of steel reinforcement in alkali activated slag concretes: A critical review

Cited by 15 publications

References 74 publications

Chloride Permeability of Alkali-Activated Slag Concretes after Exposure to High Temperatures

Chloride Permeability of Alkali-Activated Slag Concretes after Exposure to High Temperatures

Properties of High-Content Micro-Steel Fiber Self-Compacting Concrete Incorporating Fly Ash and Slag Powder Performance Study

Electrochemical Investigation of Chloride Ion-Induced Breakdown of Passive Film on P110 Casing Steel Surface in Simulated Pore Solution: Behavior and Critical Value Determination

Contact Info

Product

Resources

About