Characterization of stainless steel corrosion processes in mortar using various monitoring techniques

Hren, Miha; Kosec, Tadeja; Legat, Andraž

doi:10.1016/j.conbuildmat.2019.06.120

Cited by 21 publications

(8 citation statements)

References 34 publications

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“…A clear difference is observed in the i corr values presented by the three studied specimens, the lowest i corr values are shown for the MC-W-304 specimen, followed by the M50-W-304 specimen, and finally the M100-W-304 specimen, the i corr range of the three specimens is more than 10 times less than 0.1 µA/cm 2 , which indicates that all the specimens present a negligible level of corrosion throughout the period of exposure to the control medium according to Table 8 . The results coincide with what is reported in the literature [ 21 , 94 , 95 ].…”

Section: Resultssupporting

confidence: 92%

Corrosion Behavior of Steel-Reinforced Green Concrete Containing Recycled Coarse Aggregate Additions in Sulfate Media

et al. 2020

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Novel green concrete (GC) admixtures containing 50% and 100% recycled coarse aggregate (RCA) were manufactured according to the ACI 211.1 standard. The GC samples were reinforced with AISI 1080 carbon steel and AISI 304 stainless steel. Concrete samples were exposed to 3.5 wt.% Na2SO4 and control (DI-water) solutions. Electrochemical testing was assessed by corrosion potential (Ecorr) according to the ASTM C-876-15 standard and a linear polarization resistance (LPR) technique following ASTM G59-14. The compressive strength of the fully substituted GC decreased 51.5% compared to the control sample. Improved corrosion behavior was found for the specimens reinforced with AISI 304 SS; the corrosion current density (icorr) values of the fully substituted GC were found to be 0.01894 µA/cm2 after Day 364, a value associated with negligible corrosion. The 50% RCA specimen shows good corrosion behavior as well as a reduction in environmental impact. Although having lower mechanical properties, a less dense concrete matrix and high permeability, RCA green concrete presents an improved corrosion behavior thus being a promising approach to the higher pollutant conventional aggregates.

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Section: Resultssupporting

confidence: 92%

Corrosion Behavior of Steel-Reinforced Green Concrete Containing Recycled Coarse Aggregate Additions in Sulfate Media

et al. 2020

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“…X-ray computed microtomography (μXCT) has been used in some studies of Portland-cement-based materials over the past two decades [ 28 ]. It has also been found to be a useful, non-destructive tool for the visual assessment of steel corrosion in concrete materials, indicating the type, size and location of corrosion damage [ 29 , 30 , 31 , 32 , 33 , 34 , 35 ]. In recent years, μXCT has been limited to studying the properties of porosity in alkali-activated materials [ 36 ], with this technique not yet used to study the corrosion of steel in these materials.…”

Section: Introductionmentioning

confidence: 99%

Characterizing Steel Corrosion in Different Alkali-Activated Mortars

et al. 2021

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Alkali-activated materials (AAMs) present a promising potential alternative to ordinary Portland cement (OPC). The service life of reinforced concrete structures depends greatly on the corrosion resistance of the steel used for reinforcement. Due to the wide range and diverse properties of AAMs, the corrosion processes of steel in these materials is still relatively unknown. Three different alkali-activated mortar mixes, based on fly ash, slag, or metakaolin, were prepared for this research. An ordinary carbon-steel reinforcing bar was installed in each of the mortar mixes. In order to study the corrosion properties of steel in the selected mortars, the specimens were exposed to a saline solution in wet/dry cycles for 17 weeks, and periodic electrochemical impedance spectroscopy (EIS) measurements were performed. The propagation of corrosion damage on the embedded steel bars was followed using X-ray computed microtomography (μXCT). Periodic EIS measurements of the AAMs showed different impedance response in individual AAMs. Moreover, these impedance responses also changed over the time of exposure. Interpretation of the results was based on visual and numerical analysis of the corrosion damages obtained by μXCT, which confirmed corrosion damage of varying type and extent on steel bars embedded in the tested AAMs.

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“…Local information about mill-scale and rust layer properties may be obtained through local electrochemical measurements, either by dedicated techniques applied to rebars [8,126] or steel immersed in simulated solutions such as employing scanning vibrating electrode technique (SVET) or similar methods. CMEA has been used to measure local corrosion rates on rebar surface in mortar [79,127] and shows promise in relating these measurements to heterogeneities in the SCI such as interfacial voids and moisture variations, when coupled with some of the other techniques described in this paper. To our knowledge, this has not been attempted before.…”

Section: Electrochemical Techniquesmentioning

confidence: 99%

Methods for characterising the steel–concrete interface to enhance understanding of reinforcement corrosion: a critical review by RILEM TC 262-SCI

Wong,

Angst,

Geiker

et al. 2022

Mater Struct

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The steel–concrete interface (SCI) is a complex, multi-phase and multi-scale system. It is widely known to influence the performance and long-term durability of concrete structures. However, a fundamental understanding of its properties and effects on corrosion initiation of embedded reinforcing steel remains elusive. This is attributed to its complicated heterogeneity and time-dependent nature, exacerbated by the lack of suitable techniques for systematic and detailed characterisation. This paper, prepared by members of the RILEM Technical Committee 262-SCI, critically reviews available information regarding current methods (laboratory or field-based) for characterising local properties of the SCI that have been identified as governing factors affecting corrosion initiation. These properties include characteristics of the steel such as mill scale and rust layers, and characteristics of the concrete such as interfacial voids, microstructure and moisture content. We evaluated over twenty methods and summarised their advantages, applications and limitations. The findings show a severe lack of well established, non-destructive techniques that are suitable for direct monitoring of the SCI at a representative scale with sufficiently high resolution (spatial, temporal), particularly for moisture related aspects. Several promising novel techniques with significant potential for further development and application were identified and discussed. Finally, we provide several recommendations for future research needs that are required to advance this critically important topic.

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Characterization of stainless steel corrosion processes in mortar using various monitoring techniques

Cited by 21 publications

References 34 publications

Corrosion Behavior of Steel-Reinforced Green Concrete Containing Recycled Coarse Aggregate Additions in Sulfate Media

Corrosion Behavior of Steel-Reinforced Green Concrete Containing Recycled Coarse Aggregate Additions in Sulfate Media

Characterizing Steel Corrosion in Different Alkali-Activated Mortars

Methods for characterising the steel–concrete interface to enhance understanding of reinforcement corrosion: a critical review by RILEM TC 262-SCI

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