Influence of mortar resistivity on the rate-limiting step of chloride-induced macro-cell corrosion of reinforcing steel

Hornbostel, Karla; Angst, Ueli; Elsener, Bernhard; Larsen, Claus

doi:10.1016/j.corsci.2016.04.011

Cited by 30 publications

(20 citation statements)

References 17 publications

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“…The influence of bulk resistivity or cell resistance on the partial processes is discussed in another publication of the present authors . From the experiments, a rather poor correlation between mortar resistivity and the cathodic partial process (both Tafel constant β c and exchange current density) was obtained, which agrees well with findings in the literature .…”

Section: Discussionsupporting

confidence: 89%

“…Comparison of the instantaneous macro‐cell corrosion rate and (a) the bulk resistivity, and (b) the cell resistance after . Exposure is indicated with different symbols, compare Tables and , Portland cement ( PC ) specimens (weeks after casting): circles—week 38, triangle down—week 91, square—week 92, diamond—week 93, and triangle up—week 94, fly ash ( FA ) specimens (weeks after casting): circles—week 34, triangle down—week 90, square—week 93, and diamond—week 94.…”

Section: Resultsmentioning

confidence: 99%

“…The previously cited investigation also discusses to what extent the dimensions of the tested specimens influence the rate‐limiting step and consequently the corrosion rate. It is suggested that with increasing specimen size and for large‐scale structures, the influence of the ohmic partial process may increase while cathodic reaction‐rate‐related properties will be less important .…”

Section: Discussionmentioning

confidence: 99%

“…The simulated anodes were located in a network of stainless steel tubes and bars that acted as cathode (the setup is sketched in Figure ). The experimental setup, materials , and exposure are described below; additional details can be found in Reference .…”

Section: Methodsmentioning

confidence: 99%

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Limitations of the use of concrete bulk resistivity as an indicator for the rate of chloride‐induced macro‐cell corrosion

Hornbostel

Elsener

Angst

et al. 2017

Structural Concrete

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An experimental setup was designed to study the impact of concrete bulk resistivity on the rate of chloride‐induced reinforcement corrosion. Small pieces of mild steel were used to simulate pits (anodes) that form when chlorides come into contact with the reinforcement. The galvanic current was measured between the simulated anodes and a large cathode network. Comparisons were made between the corrosion rates calculated from the galvanic currents and the bulk resistivity. The bulk resistivity was varied using two mortar mixes (made of plain Portland cement and a Portland cement—fly ash blend), which were exposed in different temperature and moisture conditions. Despite a high scatter in the results, it was clear that the relationship between bulk resistivity and corrosion rate depended on the mortars tested. The findings presented in this article and the accompanying work strongly indicate that bulk resistivity alone does not provide sufficient information for assessment of the corrosion rate for chloride‐induced macro‐cell corrosion.

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Section: Discussionsupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Limitations of the use of concrete bulk resistivity as an indicator for the rate of chloride‐induced macro‐cell corrosion

Hornbostel

Elsener

Angst

et al. 2017

Structural Concrete

Self Cite

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“…Several authors have correlated the risk of corrosion occur and ρ [43,46,50,57,[111][112][113][130][131][132][133][134][135]. ρ measurement is a useful and additional measure in identifying problems related to concrete corrosion and in assessing the quality of concrete.…”

Section: Concrete Resistivity (ρ)mentioning

confidence: 99%

Electrochemical Sensors for Monitoring the Corrosion Conditions of Reinforced Concrete Structures: A Review

Figueira¹

2017

Applied Sciences

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Several methods for corrosion monitoring of reinforced concrete structures (RCS) have been proposed in the last few decades. These systems may be used either in new, existing or repaired structures. The corrosion monitoring can be performed by different methodologies. These may or may not be destructive, use different degrees of complexity and cost, and provide information on the progression and kinetics of the corrosion phenomena. The destructive methods are limited to sampling. Therefore, these may not be representative of the whole structure, which is extremely important in RCS with large heterogeneities both in terms of materials used and in terms of the exposure environment. Within this context, non-destructive methods have been widely developed, which are intended to provide quick information about the entire structure. Ideally, these systems should be able to detect the corrosion state of the steel inside the concrete, the main causes of corrosion and the evolution of corrosion phenomena over time. This manuscript reviews and summarizes the actual state of the art and the main achievements in the field of electrochemical sensors based on non-destructive methods for corrosion monitoring of RCS in the last few years. The challenges and perspectives in this field will also be discussed.

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Investigation of passive layer formation on steel rebars in foamed concrete

Bagheri

Rastegar

2019

Materials & Corrosion

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Foamed concrete is a versatile lightweight material which is increasingly being considered for structural and semi structural applications. This would inevitably involve incorporation of steel reinforcement inside foamed concrete. The presence of large volume of air voids in the vicinity of steel could unfavorably affect its electrochemical behavior and jeopardize the formation of the passive layer. In the current study the passive layer formation of steel embedded in foam concrete with 55% air content was investigated and compared to that of steel embedded in the same mix without foam incorporation, that is, the base mix. The electrochemical tests included half-cell potential, linear polarization resistance (LPR), potentiodynamic test, and electrochemical impedance spectroscopy (EIS). The results of half-cell potential and the LPR test show that a passive layer forms within 3 weeks of casting steel inside foamed concrete which is similar to that observed for the steel in the base mix. The results of the potentiodynamic and the EIS tests which were carried out at the age of 28 days confirmed the passivity of reinforcement embedded in both foamed concrete and the base mix K E Y W O R D S corrosion, electrochemical methods, foamed concrete, passive layer

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Influence of mortar resistivity on the rate-limiting step of chloride-induced macro-cell corrosion of reinforcing steel

Cited by 30 publications

References 17 publications

Limitations of the use of concrete bulk resistivity as an indicator for the rate of chloride‐induced macro‐cell corrosion

Limitations of the use of concrete bulk resistivity as an indicator for the rate of chloride‐induced macro‐cell corrosion

Electrochemical Sensors for Monitoring the Corrosion Conditions of Reinforced Concrete Structures: A Review

Investigation of passive layer formation on steel rebars in foamed concrete

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