Spatial distribution of crystalline corrosion products formed during corrosion of stainless steel in concrete

Serdar, Marijana; Meral, Cagla; Kunz, Martin; Bjegović, Dubravka; Wenk, Hans‐Rudolf; Monteiro, Paulo J.M.

doi:10.1016/j.cemconres.2015.02.004

Cited by 33 publications

(3 citation statements)

References 37 publications

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“…The rebar corrosion was studied in 3.5 wt% NaCl by using EIS. This technique is important for monitoring the steel corrosion mechanism and diffusion process of the chloride in solution to the metal surface . Figure shows Nyquist, Bode, and phase angle‐frequency plots corresponding to rebar‐Ref and rebar‐BS for 1 hour and 1 year in 3.5 wt% NaCl solution.…”

Section: Resultsmentioning

confidence: 99%

“…This technique is important for monitoring the steel corrosion mechanism and diffusion process of the chloride in solution to the metal surface. [37][38][39][40][41][42][43] Figure 11 shows Nyquist, Bode, and phase anglefrequency plots corresponding to rebar-Ref and rebar-BS for 1 hour and 1 year in 3.5 wt% NaCl solution. As can be seen in Figure 11A, the Nyquist's plot for rebar-BS and rebar-Ref contain one depressed semicircle in the high-frequency region and followed by a straight line in the low-frequency region.…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

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Comprehensive investigation of butyl stearate as a multifunctional smart concrete additive for energy‐efficient buildings

et al. 2019

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Summary Using of phase change materials (PCM) for increasing energy savings in sustainable buildings is receiving a lot of interest in commercial applications. Butyl stearate (BS), as PCM, can be used to maintain ambient temperature in the human comfort zone and prevent temperature fluctuations by enhancing the thermal properties of concrete. The long‐term effects of BS on concrete are not well known. In this study, the applicability of BS, as a smart concrete additive, by direct incorporation in the concrete structure was investigated comprehensively including thermal, rheological, and corrosion behaviour. The thermal characterization of PCM was achieved using DSC, TGA, thermal conductivity, and thermal buffering experiments. Thermal storage capacity of BS was measured to be 134.2 J/g, which is high enough to be used for passive solar energy storage in buildings. The fresh concrete experiments revealed that workability and flowability of fresh concrete mixes were improved. The maximum hydration temperature was reduced, and a retarding effect was observed by the addition of BS. Moreover, the corrosion behaviour of steel embedded in concrete with BS as PCM was studied in a solution of NaCl (3.5 wt%) representing an aggressive environment by utilizing electrochemical impedance spectroscopy (EIS) for long‐term corrosion tests that lasted for 1 year. The open circuit potential of steel in concrete with BS showed noble potential indicating low corrosion probability. The FESEM images and polarization resistance (Rp) values showed that the addition of BS in concrete decreases corrosion of the rebar in comparison with concrete without BS. Addition of BS not only enhances thermal capacity but also exhibits corrosion protection of rebar by hindering penetration of chloride ions into the concrete.

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Section: Resultsmentioning

confidence: 99%

Section: Electrochemical Measurementsmentioning

confidence: 99%

Comprehensive investigation of butyl stearate as a multifunctional smart concrete additive for energy‐efficient buildings

et al. 2019

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“…Relatively good results related to the possible use of low-Cr ferritic stainless steels were published decades ago [8]. At present, the performance of low-Cr ferritic reinforcements is again under study, due to their reduced price in comparison to other grades of stainless steel [9][10][11][12]. Ferritic stainless steels can be an interesting option to assure the durability of structures in moderately corrosive environments, but other alternatives should be considered for highly aggressive conditions.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Alkaline Reserve of Chloride-Contaminated Mortars on the 6-Year Corrosion Behavior of Corrugated UNS S32304 and S32001 Stainless Steels

Bautista

Velasco

Torres-Carrasco

2019

Metals

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The durability of two lean corrugated duplex stainless steel (UNS S32304 and S32001) bars manufactured for concrete reinforcement was studied in four different corrosive conditions. These duplex stainless steels are more economical than the most traditional, well-known duplex grade steels (UNS S32205). The research was carried out in mortar samples for six years. In half of the samples, the alkaline reserve had been previously decreased, and their pH was slightly below 12, while in the other half, the pH close to the bars remained as-manufactured. Moreover, there were samples with modified and non-modified alkaline reserve where chlorides had been previously added to the mortar which were exposed to high relative humidity. In other samples—which were partially immersed in 3.5% NaCl—the chlorides entered through the mortar by natural diffusion. The electrochemical behavior of the reinforcements in these conditions was periodically monitored through corrosion potential (Ecorr) and electrochemical impedance spectroscopy (EIS) measurements during the whole testing period. The samples were anodically polarized at the end of the exposure. The results prove that the decrease in the alkaline reserve of the mortars can affect the corrosion behavior of the studied lean duplex in environments with high chloride concentrations. The duplex microstructure of the reinforcements makes it so that the corrosion proceeds by selective attack of the phases.

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Concrete Corrosion Characterization Using Advanced Microscopic and Spectroscopic Techniques

Mittermayr

Gluth

Grengg

et al. 2023

Engineering Materials

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Spatial distribution of crystalline corrosion products formed during corrosion of stainless steel in concrete

Cited by 33 publications

References 37 publications

Comprehensive investigation of butyl stearate as a multifunctional smart concrete additive for energy‐efficient buildings

Comprehensive investigation of butyl stearate as a multifunctional smart concrete additive for energy‐efficient buildings

Influence of the Alkaline Reserve of Chloride-Contaminated Mortars on the 6-Year Corrosion Behavior of Corrugated UNS S32304 and S32001 Stainless Steels

Concrete Corrosion Characterization Using Advanced Microscopic and Spectroscopic Techniques

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