Experimental investigations on the influence of cover depth and concrete quality on time to cover cracking due to carbonation-induced corrosion of steel in RC structures in an urban, inland environment

Otieno, Mike; Ikotun, Jacob Olumuyiwa; Ballim, Y.

doi:10.1016/j.conbuildmat.2018.11.215

Cited by 56 publications

(23 citation statements)

References 45 publications

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“…Corrosion caused by concrete carbonation in the concrete cover usually results from the impact of the carbon dioxide in the air, as well as changes of the ambient temperature and humidity [26,27]. In reinforced concrete structures, the concrete (if sufficiently waterproofed and made with appropriate and properly mixed ingredients) provides basic and also the most efficient protection of the reinforcement [monograph].…”

Section: Corrosion Henomenamentioning

confidence: 99%

Electrochemical Diagnostics of Sprayed Fiber-Reinforced Concrete Corrosion

Raczkiewicz

Kossakowski

2019

Applied Sciences

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Sprayed fiber-reinforced concrete is used in construction for the execution and repair of reinforced concrete elements. It is believed that the addition of steel fibers is most effective, due to their parameters and low costs. Some researchers, however, suggest that the addition of steel fibers can contribute to the initiation of corrosion of the main reinforcement. In consideration of the differences of opinion on the corrosion resistance of sprayed fiber-reinforced concrete, it has become necessary to analyze this issue. The article presents comparative studies of corrosion assessments of the main reinforcement in specimens made of ordinary concrete and concrete with steel fibers. The tests were performed using a semi non-destructive galvanostatic pulse method, which allows location of the areas of corrosion and estimation of the reinforcement corrosion activity. In order to initiate the corrosion processes the specimens were subjected to freezing cycles in NaCl solution. In addition, the shrinkage and compressive strength of specimens were measured, and the observation of specimen structure under a scanning microscope was performed. It was found that galvanostatic pulse method allowed estimation of the reinforcement corrosion progress. The corrosion of the main reinforcement in steel fiber reinforced concrete specimens was less advanced than in the specimens without fibers.

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Section: Corrosion Henomenamentioning

confidence: 99%

Electrochemical Diagnostics of Sprayed Fiber-Reinforced Concrete Corrosion

Raczkiewicz

Kossakowski

2019

Applied Sciences

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“…It can be observed that the neutralisation depth in the FC mode is greater than that in the CF mode. is is because when the concrete is rst exposed to carbonation, the carbonised products ll the internal voids of concrete, thus enhancing the compactness of concrete [5]. However, if the concrete is rst exposed to freeze-thaw, the freezing e ect generates many microcracks in the concrete and causes surface cracking and even peeling [42].…”

Section: Change Law Of Neutralisation Depthmentioning

confidence: 99%

“…Hence, freeze-thaw is often considered in structural design [2][3][4]. Meanwhile, concrete neutralisation is closely related to durability, which is a primary cause of steel corrosion [5].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Neutralisation of Concrete with Fly Ash as Fine Aggregate in Freeze‐Thaw Environment

Zhang

Mao

Yang

et al. 2019

Advances in Civil Engineering

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To study the durability of concrete with fly ash as fine aggregate under alternate freeze-thaw and carbonation, freeze-thaw and carbonation cyclic tests are conducted to explore variation characteristics such as relative dynamic modulus of elasticity and neutralisation depth. The influence coefficient (λC) of carbonation on concrete freeze-thaw damage and the influence coefficient (λF) of freeze-thaw on concrete neutralisation are introduced. In addition, scanning electron microscopy is performed to reveal the deterioration mechanism of the alternating effect. Finally, through a regression analysis of test data, the mathematical expression of the composite damage coefficient kF under alternate freeze-thaw and carbonation is obtained. Based on these findings, a prediction model of the neutralisation depth of concrete is established with number of freeze-thaw cycles and water-cement ratio as parameters. The values calculated through this model and the values measured in the tests are highly correlated. This provides a theoretical reference and basis for the analysis of concrete durability in a multifactor environment.

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“…The physical method is to use physical or mechanical means (optical fiber sensor, resistance probe technology, magnetic resistance probe technology, etc.) to monitor and analyze the corrosion process [ 28 , 29 ]. However, the physical method is more complicated, and the sensor has a shorter life and higher price.…”

Section: Introductionmentioning

confidence: 99%

Steel Corrosion Evaluation of Basalt Fiber RPC Affected by Crack and Steel-Concrete Interface Damage Using Electrochemical Methods

Liu¹,

Lyu²,

Zhang³

et al. 2020

Sensors

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Basalt fiber (BF) is a new anti-corrosion and environmentally friendly material, which is expected to delay the corrosion process of steel bars and improve the durability of reinforced reactive powder concrete (RPC). The electrochemical method is a nondestructive testing and real-time monitoring technique used to characterize the corrosion behaviors of steel bars embedded in concrete structures. In this paper, the electrochemical technique was employed to evaluate the corrosion of steel bars embedded in basalt fiber modified reactive powder concrete (BFRPC). Besides, crack and steel-concrete interface damage (SCID) were considered as typical factors that affect steel corrosion in concrete. Thus, both reinforced fiber-free RPC and BFRPC specimens with crack and SCID were prepared for evaluating the steel corrosion behaviors by electrochemical methods. The results revealed that both crack and SCID would aggravate the steel corrosion, and the crack was the major factor that affects the corrosion process. Moreover, the excellent compactness of BFRPC and the bridging action of BF could effectively prevent the concrete cracking and steel corrosion process of concrete. Using reinforced BFRPC instead of ordinary concrete in practical projects could greatly extend the service life of steel bars.

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Experimental investigations on the influence of cover depth and concrete quality on time to cover cracking due to carbonation-induced corrosion of steel in RC structures in an urban, inland environment

Cited by 56 publications

References 45 publications

Electrochemical Diagnostics of Sprayed Fiber-Reinforced Concrete Corrosion

Electrochemical Diagnostics of Sprayed Fiber-Reinforced Concrete Corrosion

Experimental Investigation of Neutralisation of Concrete with Fly Ash as Fine Aggregate in Freeze‐Thaw Environment

Steel Corrosion Evaluation of Basalt Fiber RPC Affected by Crack and Steel-Concrete Interface Damage Using Electrochemical Methods

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