Service life prediction of concrete wharves with early-aged crack: Probabilistic approach for chloride diffusion

Kwon, Seung Jun; Na, Ung Jin; Park, Sang Soon; Jung, Sang Hwa

doi:10.1016/j.strusafe.2008.03.004

Cited by 274 publications

(132 citation statements)

References 20 publications

(25 reference statements)

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“…Chloride attack is a major factor in the corrosion of reinforcing bars embedded in concrete. Kwon et al [8] proposed a chloride diffusion model based on a diffusion equation derived from Fick's second law that considers the time dependence of the chloride diffusion coefficient (D) and the dependence of the diffusion coefficient correction factor ( f (w c )) on the width of cracks in the concrete. In this study, the initiation time for the performance of the structure to degrade was calculated by using the improved chloride diffusion equations given below:…”

Section: Determination Of the Degradation Initiation Time Of The Psc-mentioning

confidence: 99%

“…This study referred to Val and Melcher's work [11] to determine the penetration ratio. Table 11 presents the corrosion parameters used in the analysis [8,10,11,17]. To consider the effect of cracks on the resistance capacity, the existence and size of cracks in the girder were classified in the analysis.…”

Section: Performance Degradation Analysis Considering a Corrosive Envmentioning

confidence: 99%

See 1 more Smart Citation

Reliability Evaluation of a PSC Highway Bridge Based on Resistance Capacity Degradation Due to a Corrosive Environment

Kim¹,

Choi

Ham

et al. 2016

Applied Sciences

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This paper presents a method for evaluating the reliability of an in-service highway bridge that considers the resistance capacity loss due to various corrosive environments. To demonstrate the application of the suggested method, a pre-stressed concrete-I (PSC-I) type girder was selected as a sample bridge. An analytical procedure was developed to quantitatively evaluate the performance degradation of a PSC-I girder bridge considering the traffic conditions, corrosive environment, and crack damage. The bridge performance was evaluated by considering traffic conditions, including the annual average daily traffic volume, heavy vehicle volume, and corrosive environment (mild, normal, and severe). To calculate the resistance capacity, all variables regarding the materials and sections were considered through probabilistic variances, Monte Carlo simulation, and the statistical characteristics of the resistance. The results showed that the performance degradation is sensitive to the important parameters of the traffic conditions and corrosive environment, which may decrease the structural reliability and lead to bridge failure. Cracks in a PSC-I girder may accelerate the performance degradation and affect the reliability level of the bridge. Therefore, a maintenance plan should be rationally considered depending on the site environment.

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Section: Determination Of the Degradation Initiation Time Of The Psc-mentioning

confidence: 99%

Section: Performance Degradation Analysis Considering a Corrosive Envmentioning

confidence: 99%

Reliability Evaluation of a PSC Highway Bridge Based on Resistance Capacity Degradation Due to a Corrosive Environment

Kim¹,

Choi

Ham

et al. 2016

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…Effects of cracks on the chloride diffusion and permeation in concrete have been investigated by many researchers. Kwon, Na, Park, and Jung (2009) considered that crack width could be only regarded as a governing parameter in deriving the function of diffusion coefficient in cracked concrete. Based on the results got from field investigations, a calculation model of apparent chloride diffusion coefficient in the early cracked concrete was proposed by simply considering the effect of crack width, shown in Equation (5).…”

Section: Equivalent Chloride Diffusion In Cracked Concrete With Dryinmentioning

confidence: 99%

“…Hence, for the transverse cracking concrete members, it is triable to use Fick's second law to describe chloride profiles in cracked concrete using 'equivalent apparent chloride diffusion coefficient, D eq ' instead of D a in Equation (4) (Gowripalan, Sirivivatnanon, & Lim, 2000). Furthermore, according to regressive results as shown in Kwon et al (2009) and Park et al (2012), the relationship between D eq and D a can be given as follows:…”

Section: Equivalent Chloride Diffusion In Cracked Concrete With Dryinmentioning

confidence: 99%

Effect of Transverse Crack on Chloride Penetration into Concrete Subjected to Drying–Wetting Cycles

Lu¹,

Gao²,

Liu³

2014

Proceedings of the 4th International Conference on the Durability of Concrete Structures

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In this paper, several transversely cracked RC beams, self-anchored in a three-point bending mode, were prepared and subjected to NaCl solution drying-wetting cycles. Based on two experimental results obtained after 15 and 30 cycles, respectively, the profiles of free chloride concentration at different sections of sound and cracked concretes were presented and analyzed. The depth of surface convection zone in cracked concretes subject to chloride drying-wetting cycles is about 10-20 mm, which may increase gradually with the increasing of crack width. Then, it can be found that the speed of chloride penetration in concrete will be increased by cracks. Based on the equivalent diffusion model proposed in this paper, the apparent chloride diffusion coefficients for all sound and cracked sections were calculated. It can be found from the fitting precision that the equivalent diffusion model is suitable for analyzing the chloride penetration in flexural cracked concrete when its surface crack width is less than 0.3 mm. Furthermore, the relationship between crack width and equivalent diffusion coefficient can be described with quadratic function of crack effect.

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“…The mechanism of the chloride penetration into concrete is widely thought as the diffusion due to the concentration gradient and the convection under pressure (including the capillary suction caused by the surface tension) (Kwon, Na, Park, & Jung, 2009;Marchand & Samson, 2009;Muigai, Moyo, & Alexander, 2012). In fact, the chloride penetration into concrete is always the combination of diffusion and convection and is a complex process.…”

Section: Introductionmentioning

confidence: 99%

Chloride Penetration in Surface-Treated Concrete in Natural and Accelerated Environments

Dong¹,

Zhao²,

Pu³

et al. 2016

Proceedings of the 5th International Conference on the Durability of Concrete Structures

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This study investigated the chloride penetration of surface-treated concrete in natural and accelerated environments. A part of a real concrete port, including the beams and the columns, was investigated. Concrete specimens cast together with the concrete port were transported to the lab and subjected to wetting and drying cycles for accelerating the ingression of chloride ion. Chloride concentration of the specimens in the lab and the components in situ was tested. The results show that the surface treatments obviously slow down the chloride penetration into the concrete in both lab and in situ. The chloride penetration in situ is more severe than that in specimens under wetting and drying cycles. For the components of the real concrete port, the chloride concentration tested in summer is found higher than that in winter and the chloride concentration in the tensile region of bending beam is higher than that in the column.

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Service life prediction of concrete wharves with early-aged crack: Probabilistic approach for chloride diffusion

Cited by 274 publications

References 20 publications

Reliability Evaluation of a PSC Highway Bridge Based on Resistance Capacity Degradation Due to a Corrosive Environment

Reliability Evaluation of a PSC Highway Bridge Based on Resistance Capacity Degradation Due to a Corrosive Environment

Effect of Transverse Crack on Chloride Penetration into Concrete Subjected to Drying–Wetting Cycles

Chloride Penetration in Surface-Treated Concrete in Natural and Accelerated Environments

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