Effect of design parameters on microstructure of steel-concrete interface in reinforced concrete

Chen, Fangjie; Li, Chun‐Qing; Baji, Hassan; Ma, Baoguo

doi:10.1016/j.cemconres.2019.01.005

Cited by 36 publications

(24 citation statements)

References 21 publications

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“…Similar observations were reported to determine the effects of silica fume additions on the concrete-aggregate interface [147][148][149]. In this field, Chen et al [150] reported that water-to-cement ratio of concrete has a considerable impact on porous zone thickness ( Fig. 7), so that the pores and voids at RCI increase with the w∕c ratio.…”

Section: Interface Porosity At Rcisupporting

confidence: 76%

“…Hence, it can clearly show that present findings are not reliable for new types of concrete. Many studies reported the enriched content of calcium hydroxide at the RCI, as compared with the bulk cement paste [140,146,150,[153][154][155][156][157][158]. The existence of calcium hydroxide at the RCI was severely observed by the SEM images and EDS analysis [139].…”

Section: Calcium Hydroxide Content At Rcimentioning

confidence: 99%

“…Effects of silica fume on porosity percentage of the transition zone (adapted from Zayed[140]) Effect of the water-to-cement ratio on porous zone thickness at RCI (adapted from Chen et al[150]) Scientific database used in the present study for the second scenario of the RCI bonding…”

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confidence: 99%

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A critical review of the effect of concrete composition on rebar–concrete interface (RCI) bond strength: A case study of nanoparticles

2020

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Minimum concrete cover for rebar, rebar diameter, concrete compressive strength, embedded length of rebar, and lateral reinforcement by stirrups are the crucial factors considered in existing predicting equations and regulations for predicting rebar-concrete interface (RCI) bond strength. However, considerable effects of concrete composition on RCI are ignored in design codes and investigations. This paper intends to comprehensively highlight the critical aspects of this research gap. Additionally, a practical experimental approach is described in the present study to efficiently consider the effect of the new generations of concrete on RCI bond strength. Finally, nano-concrete is considered as a case study to show the importance of nanoparticle types on RCI bond strength. Overall results show that studying the microstructure of the transition zone at RCI is essential to accompany with the RCI bond strength for considering new generations of concrete in reinforced concrete structures. Additionally, the current study emphasizes that more investigations are necessary to be conducted by future works to fill the existing research gaps in RCI.

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Section: Interface Porosity At Rcisupporting

confidence: 76%

Section: Calcium Hydroxide Content At Rcimentioning

confidence: 99%

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A critical review of the effect of concrete composition on rebar–concrete interface (RCI) bond strength: A case study of nanoparticles

2020

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“…Using the experimental data reported in Chen et al 23 study, a model relating the thickness of porous ring at the steel-concrete interface and w/c ratio and concrete cover could be developed. As only two cover thicknesses were used in Chen et al 23 study, here the cover thickness is not considered in model calibration, and thickness of porous ring is only related to the w/c ratio. As w/c ratio would equally affect thickness of porous ring at all points around the steel bar, the nonuniform thickness of steel-concrete interface F I G U R E 8 Simulated results versus the best-fit response surface model is replaced by an equivalent thickness.…”

Section: Thickness Of the Porous Ring δmentioning

confidence: 99%

Probabilistic model for time to cover cracking due to corrosion

Baji

Yang

et al. 2020

Structural Concrete

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The time to cover cracking is widely used as a service life indicator in the assessment of deterioration of corrosion‐affected reinforced concrete structures. This paper presents a general probabilistic procedure for prediction of time to cover cracking. Within this procedure, the response surface method (RSM) is employed to calibrate a new model for calculating of radial displacement required for cover cracking based on the results obtained from the finite element (FE) analysis. By taking advantage of the central limit theorem (CLT), simple but accurate probabilistic models for prediction of time to cover cracking that only rely on the knowledge of first and second moments of basic random variables are derived. Rigorous simulation analysis has proved the accuracy of these models. It is shown in the paper that using this probabilistic procedure, factors affecting randomness of time to cover cracking can be easily identified. It is also shown that the time to cover cracking is highly variable with the concrete cover, tensile strength of concrete, corrosion current density, and the model error as the most influential factors on its randomness.

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“…Hay et al [ 23 ] studied the influence of artificial cracks and SCID on the corrosion of ordinary concrete steel bars and reported that the existence of cracks increased the corrosion rate of steel bars, and the SCID further intensified the corrosion. Chen et al [ 24 ] found that porous bands at the steel-concrete interface in making concrete can significantly affect the vacuum process of concrete. In this paper, according to the deicing salt environment of bridge constructions in cold regions, reinforced BFRPC specimens were immersed in a chloride solution for evaluating the steel corrosion behavior.…”

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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Effect of design parameters on microstructure of steel-concrete interface in reinforced concrete

Cited by 36 publications

References 21 publications

A critical review of the effect of concrete composition on rebar–concrete interface (RCI) bond strength: A case study of nanoparticles

A critical review of the effect of concrete composition on rebar–concrete interface (RCI) bond strength: A case study of nanoparticles

Probabilistic model for time to cover cracking due to corrosion

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

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