Corrugated stainless steels embedded in carbonated mortars with and without chlorides: 9-Year corrosion results

Bautista, A.; Alvarez, S.M.; Paredes, Edgar; Velasco, F.; Guzmán, S.

doi:10.1016/j.conbuildmat.2015.07.099

Cited by 29 publications

(12 citation statements)

References 40 publications

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“…The PI-PC samples tended to have lower chloride concentration than the PI samples. This has also been observed in previous research, when the chloride concentrations in non-carbonated mortars [2] were compared to those in carbonated mortars [3] after similar long-term natural diffusion studies. The precipitation of some carbonates inside the pores of the mortar due to the reaction of the CO 2 of the chamber with the hydroxides of the pore solution should obviously represent a slight blockage for the diffusion of chloride ions [34].…”

Section: Resultssupporting

confidence: 86%

“…In these figures, the relationship between E corr and corrosion probability proposed in the ASTM C876 standard is included. The standard proposes this criterion for non-coated carbon steel reinforcements, but previous results of our group [2,3,35,36] prove its utility also for monitoring stainless steel reinforcements.…”

Section: Resultsmentioning

confidence: 99%

“…Stainless steels are increasingly used as reinforcement bars for concrete structures exposed to corrosive environments or with a long design life, as they have already shown high chloride concentration threshold [1] and high chemical durability when they are embedded in mortar [2,3]. Their high corrosion resistance is due to the formation of a passivating layer on their surface, which has a duplex structure [4], and whose protective properties increase with the pH of the media [5].…”

Section: Introductionmentioning

confidence: 99%

“…For very corrosive environments, austenitic stainless-steel grades such as UNS S30400 and S31600 were initially proposed and used as reinforcements [13]. Then, the duplex UNS S32205 appeared in the market, proving its excellent corrosion resistance in simulated concrete solutions [14,15] and in mortars [2,3].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…This criterion has been used in previous research [27] with the same aim. Results of non-welded materials submitted to similar tests [27,52] have also been included in the figure for comparison. Similar welded stainless steels need anodic polarizations to corrode at high rate that are proportional to their corrosion resistance when they are non-welded [17].…”

Section: Similar Welded Grade Exposure Time (Months)mentioning

confidence: 99%

Welded, sandblasted, stainless steel corrugated bars in non-carbonated and carbonated mortars: A 9-year corrosion study

et al. 2016

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Institutional RepositoryThis is a postprint version of the following published document:A. Bautista (et al.). Three different stainless steel corrugated grades ( UNS 520430, 530403 and 532205) were similar welded to stainless steel bars with the same composition and dissimilar welded to carbon steel ( CS) . After deaning the welding oxides by sandblasting, the reinforcements were embedded in mortar with chlorides and some of the samples were carbonated. Corrosion activity was monitored using corrosion potential ( Ecorr) and electrochemical impedance spectroscopy( EIS) . After 8 years of exposure, the samples were anodically polarized. Visual evaluation of the attack was performed after another additional year of exposure. Similar welded stainless steels offer a good durability if they have been sandblasted, except for 520430 when it is embedded in carbonated mortar with chlorides. Dissimilar welded steels are active since the beginning of the exposure for both studied conditions, but sandblasting reduces the corrosion rate of CS compared to non-welded CS bars. C. Welding

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Electrochemical Technique to Evaluate Carbonation Behavior of Reinforced Concrete

Kaur,

Saluja,

Goyal

2023

Lecture Notes in Civil Engineering

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Corrugated stainless steels embedded in carbonated mortars with and without chlorides: 9-Year corrosion results

Cited by 29 publications

References 40 publications

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

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

Welded, sandblasted, stainless steel corrugated bars in non-carbonated and carbonated mortars: A 9-year corrosion study

Electrochemical Technique to Evaluate Carbonation Behavior of Reinforced Concrete

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