The effect of carbonation on chloride redistribution and corrosion of steel reinforcement

Mi, Tangwei; Li, Yongqiang; Liu, W.; Dong, Zhijun; Gong, Qianyi; Min, Changjun; Xing, Feng; Wang, Yaocheng; Chu, Sharon Lynn

doi:10.1016/j.conbuildmat.2022.129641

Cited by 18 publications

(3 citation statements)

References 56 publications

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“…The increased inner cracks delay the propagation of electrons in the RPC. Therefore, the R is decreased by NaCl action, leading to an increase in the R of reinforced RPC [ 40 , 41 ]. When the dosages of SAA are increased, the initial R is increased and the increasing rates of R are decreased, indicating that the corrosion resistance of reinforced RPC is improved by adding the SAA.…”

Section: Resultsmentioning

confidence: 99%

The Corrosion Resistance of Reinforced Reactive Powder Concrete with Secondary Aluminum Ash Exposed to NaCl Action

Jiang

Wang

2023

Materials

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Secondary aluminum ash (SAA) is a type of common solid waste which leads to pollution without treatment. Due to its chemical reactivity, the application of SAA to reactive powder concrete (RPC) may help solidify this solid waste while increasing its performance. However, RPC is usually in active service when used with steel bars. NaCl can corrode the steel bars when reinforced RPC is used in a coastal environment. In this study, the corrosion resistance of reinforced RPC was investigated. The specimens were exposed to an environment of NaCl with freeze–thaw cycles (F-Cs) and dry–wet alternations (D-As). The corresponding mass loss rates (MRs), the electrochemical impedance spectroscopy (EIS) curves and the dynamic modulus of elasticity (DME) were measured. The results show that the MR and the DME of reinforced RPC decrease with increasing values of F-C and D-A. F-C and D-A increases lead to increased electrical resistance (R). The real part value corresponding to the extreme point of the EIS curve is increased by 0~213.7% when the SAA is added. The relationship between the imaginary part and the real part of the EIS fits the quadratic function. The equivalent circuit of the reinforced RPC is obtained from the EIS curves. The R of the rust is calculated by using the equivalent circuit. The rust’s R decreases in the quadratic function with the mass ratio of the SAA. After 200 NaCl F-Cs, the MR, the DME and the R vary within the ranges of 23.4~113.6%, −2.93~−4.76% and 4.92~13.55%. When 20 NaCl D-As are finished, the MR, the DME and the R vary within the ranges of 34.7~202.8%, −13.21~−14.93% and 120.48~486.39%. The corrosion area rates are 2.3~68.7% and 28.7~125.6% higher after exposure to 200 NaCl F-Cs and 20 NaCl D-As. When the SAA is mixed, the MR is decreased by 0~13.12%, the DME increases by 0~3.11%, the R of the reinforced RPC increases by 26.01~152.43% and the corrosion area rates are decreased by 21.39~58.62%. This study will provide a novel method for solidifying SAA while improving the chlorine salt resistance of RPC.

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Section: Resultsmentioning

confidence: 99%

The Corrosion Resistance of Reinforced Reactive Powder Concrete with Secondary Aluminum Ash Exposed to NaCl Action

Jiang

Wang

2023

Materials

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“…At the same time, it should be noted that a decrease in the pH of the pore solution at the phase interface due to carbonation or pit nucleation (chloride-induced corrosion) can cause the release of bound chloride anions, which increase the aggressiveness of the condensate at the phase interface [32,49,50]. The pit growth rate (after stabilization of the pits) is subsequently related to the rate of O 2 and H 2 O transport through the concrete cover [38].…”

Section: Introductionmentioning

confidence: 99%

Predicted Corrosion Performance of Organofunctional Silane Coated Steel Reinforcement for Concrete Structures: An Overview

Pokorný,

Kouřil

2024

Buildings

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This article provides a comprehensive overview of the potential use of organofunctional silane coatings in the corrosion protection of concrete reinforcement in close relation to other commercially used coating technologies—i.e., epoxy coatings and bath hot-dip galvanizing coatings. The application technology of the steel surface is described in detail, and the corrosion performance and bond strength in concrete are compared. The paper also points out the possibility of improving the durability of epoxy coatings by the addition of silanes and, in the case of application to the surface of hot-dip galvanized steel, they can prevent corrosion of the coating by hydrogen evolution. The application potential of organofunctional silanes is also presented in the form of hydrophobic coatings on concrete surfaces or as corrosion inhibitors in simulated concrete pore solutions. The use of a suitable type of modified silane coating on the surface of carbon steel reinforcement can increase the corrosion performance and can also increase the bond strength in concrete. However, these facts need to be experimentally verified.

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“…According to the investigation and research of Chinese coastal engineering, steel corrosion was dominant in most of the causes of concrete structure damage. In some marine construction, due to chloride ion penetration and concentration accumulation on the steel surface of reinforced concrete, the passivation film of the steel was destroyed, and the protective layer of concrete was carbonized prematurely, which affected the service life of marine engineering buildings [1][2] . At present, a kind of rust inhibitor is the most effective method, but an insufficient amount of such products will accelerate the corrosion of steel.…”

Section: Introductionmentioning

confidence: 99%

The corrosion resistance of Al-Fe-Co-Cr-Ni-Cu high entropy alloy coatings

Niu

Luan

Yan

et al. 2023

J. Phys.: Conf. Ser.

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A high entropy alloy AlxFeCoCrNiCu (x=0.5, 1) coating was prepared by the electron beam evaporation method on the surface of the steel. The influence of aluminum content on the corrosion resistance of the coating is discussed. The obtained results show that the HEA coatings retain the HEA phase structure without any phase change. The polarization curves show that the high entropy alloy coating of Al0.5FeCoCrNiCu had better corrosion resistance in 0.5 mol/L H2SO4 solution and 1 mol/L NaCl solution. This design of the HEA coatings provides a novel method for steel corrosion-resistant materials.

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The effect of carbonation on chloride redistribution and corrosion of steel reinforcement

Cited by 18 publications

References 56 publications

The Corrosion Resistance of Reinforced Reactive Powder Concrete with Secondary Aluminum Ash Exposed to NaCl Action

The Corrosion Resistance of Reinforced Reactive Powder Concrete with Secondary Aluminum Ash Exposed to NaCl Action

Predicted Corrosion Performance of Organofunctional Silane Coated Steel Reinforcement for Concrete Structures: An Overview

The corrosion resistance of Al-Fe-Co-Cr-Ni-Cu high entropy alloy coatings

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