Characteristics of concrete cracks and their influence on chloride penetration

Wang, Hailong; Dai, Jian‐Guo; Sun, Xiao; Zhang, Xiao Long

doi:10.1016/j.conbuildmat.2016.01.002

Cited by 141 publications

(45 citation statements)

References 27 publications

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“…Results of One-way ANOVA for crack spacing are listed in Table 9. From Tables 7-9, it can be concluded that F-values of crack width and crack number are larger than F 0.01 (3,8), which means the probability is 99% that crack width and crack number present a significant influence of rebar corrosion. Meanwhile, F-value of crack number is larger than that of crack width, which means the influence of crack number is larger than crack width.…”

Section: The Effect Of Crack On Corrosion Behavior Of Rebarmentioning

confidence: 99%

“…Each specimen was placed between two acrylic cells defined as cathode cell and anode cell. The volume of each cell is 270 cm 3 . Cathode cell was filled with 3.5 wt % NaCl solution, and anode cell was filled with 0.3 mol/L NaOH solution.…”

Section: Accelerated Chloride Penetration Experimentsmentioning

confidence: 99%

“…Rebar in concrete are not prone to corrosion within a short time in sound concrete due to the high and stable alkalinity of concrete pore solution. However, cracks will be formed due to material shrinkage, thermal gradients and repeated mechanical loading causing a higher osmotic pressure, which often leads to a higher chloride diffusion coefficient in concrete [3,4]. Besides, cracks provide a convenient channel for water ingression, harmful ions and oxygen towards the internal concrete and the surface of rebar, which could result in accelerating corrosion of rebar.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Crack on Durability of RC Material under the Chloride Aggressive Environment

et al. 2018

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Exposed to aggressive environments, the rebar in reinforced concrete (RC) bridges will be corroded gradually. Durability of RC material mostly depends on the rebar corrosion behavior. In this research, influences of crack on rebar corrosion were investigated. Firstly, RC specimens with different crack number, width and spacing were prepared and the rebar corrosion was conducted through an accelerated chloride penetration method. Then, corrosion current densities of rebar were calculated from electrochemical test methods including liner polarization (LP), Tafel potentiodynamic polarization (TPP) and electrochemical impedance spectroscopy (EIS) measurements. Finally, the discussion was presented about a more reasonable electrochemical testing method for rebar corrosion in RC material. Besides, the significant influence factor among crack width, number and spacing was evaluated based on both One-way analysis of variance (One-way ANOVA) and Turkey's honest significant difference (Turkey's HSD) test. The results revealed that a more reasonable way to obtain corrosion current densities of rebar is combining EIS measurement with TPP measurement. Crack number shows the most significant effect on corrosion behavior of rebar, while crack spacing possesses the least one.

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Section: The Effect Of Crack On Corrosion Behavior Of Rebarmentioning

confidence: 99%

Section: Accelerated Chloride Penetration Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Crack on Durability of RC Material under the Chloride Aggressive Environment

et al. 2018

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“…하지만 제설제의 주성분인 염화물이 콘크리트 표면으로부터 침투하여 구조물에 열화를 발생 시키는 사례가 급증하고 있다 20) . 이러한 열화현상은 침투 된 염소 이온이 철근의 부동태막을 파괴시켜 철근을 부 식시키고, 팽창된 철근의 팽창압에 의해 콘크리트에 균 열을 야기시켜 열화를 더욱 가속화 시킨다 [4][5][6][7] . 따라서 전 세계적으로 염소 이온 침투에 의한 열화현상을 최소화하 기 위한 연구가 활발히 진행되고 있다.…”

Section: 서 론unclassified

Influence of Air Void Characteristic on Chloride Diffusion Coefficient and Compressive Strength of Concrete using Urea and Sulfur

Kim¹,

Hong²,

Jeon³

2016

Journal of the Korean Society of Safety

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: This study presents the effect of urea and sulfur admixture on compressive strength, chloride diffusion coefficient, and internal void distribution of concrete. Compressive strength of concretes with urea admixture by 5% increased by 5% relative to Control. However, that of concretes with urea admixture over 10% decreased. Chloride diffusion coefficient of concrete with urea and sulfur admixture decreased by 40% relative to Control. Additionally, the volume of internal void of concrete with urea and sulfur admixture decreased by 20% relative to Control. Therefore, it can be mentioned from test results that the use of adequate urea and sulfur admixture improves the mechanical properties and durability of concrete.

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“…The chloride diffusion in concrete was accelerated due to the defects of the RC beams caused by the actions of loads, environments, and climate conditions [12]. For all actions, flexural cracks in RC beams are an unavoidable phenomenon and have a significant effect on chloride diffusion [13]. Some studies [14][15][16] reported that crack width and depth significantly influence the chloride permeability in concrete.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior and Chloride Penetration of Precracked Reinforced Concrete Beams with Externally Bonded CFRP Exposed to Marine Environment

Xie

Guan

Zhan

et al. 2016

International Journal of Polymer Science

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Cracked reinforced concrete (RC) beams can be repaired effectively by using externally bonded CFRP sheets. However, when the strengthened beams are subjected to marine environment, long-term performance will be affected by the material and the interface deterioration of concrete and CFRP. Therefore, to evaluate the service life of the strengthened beams, this study investigates the behavior of precracked RC beams strengthened with CFRP sheets exposed to marine environment. Accelerated ageing experiments were carried out by exposing specimens to cyclic wetting in sea water and drying in 40°C air for 3 months and 6 months, respectively. After the environment exposure, four-point bending test was conducted and then the diffusion of chlorides in the strengthened beams was analysed. The results show that the bonding behavior of the adhesive was weakened and the ductility of the strengthened beams was slightly reduced due to the marine environment. But there is no obvious strength difference between the strengthened beams suffered from marine environment for 3 months and 6 months. Besides, the precracks in the RC beams accelerated the chloride diffusion, while CFRP bonding reduced the chloride penetration. In addition, NEL method was employed to validate the effect of the cracks on chloride permeability. The results showed that the chloride diffusion coefficients increased with the depth of the cracks.

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Characteristics of concrete cracks and their influence on chloride penetration

Cited by 141 publications

References 27 publications

Effect of Crack on Durability of RC Material under the Chloride Aggressive Environment

Effect of Crack on Durability of RC Material under the Chloride Aggressive Environment

Influence of Air Void Characteristic on Chloride Diffusion Coefficient and Compressive Strength of Concrete using Urea and Sulfur

Mechanical Behavior and Chloride Penetration of Precracked Reinforced Concrete Beams with Externally Bonded CFRP Exposed to Marine Environment

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