Current Trends of Durability Design and Government Support in South Korea:  Chloride Attack

Kwon, Seung-Jun

doi:10.3390/su9030417

Cited by 10 publications

(7 citation statements)

References 37 publications

(39 reference statements)

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“…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. Besides, F-value of crack spacing is between F 0.1 (1,4) and F 0.05 (1,4), which means that the probability is 90% that crack spacing is the significant effect on rebar corrosion.…”

Section: The Effect Of Crack On Corrosion Behavior Of Rebarmentioning

confidence: 98%

“…Besides, in the process of bridge reinforcement, environmental problems including noise pollution, dust pollution and consumption of natural resources will occur. Meanwhile, the corrosion of rebar in concrete is crucial to the durability of RC structures, especially in chloride aggressive environments [1,2]. 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.…”

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: 98%

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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“…This is because diffusion coefficient drops dramatically due to the decrease in pore structure and increase in chloride adsorption in concrete with slag, which has been reported in many literatures (Kwon 2017;Thomas and Bamforth 1999;Thomas and Bentz 2002).…”

Section: Calculation Of Repairing Cost Considering Probability Distrimentioning

confidence: 86%

“…For estimation of repairing number and cost in the view of engineering, a quantitative governing equation containing design parameters, mix conditions, and exterior conditions should be determined in advance. Critical condition which means maximum allowable criteria is compared with the required minimum performance considering service life (Kwon 2017). In the conventional LCC program for chloride attack, the induced chloride content from surface chlorides is evaluated and repairing cost is calculated after determining the period when the induced one exceeds the critical chloride content which can cause corrosion initiation (Thomas and Bamforth 1999;Thomas and Bentz 2002).…”

Section: Introductionmentioning

confidence: 99%

Maintenance for Repaired RC Column Exposed to Chloride Attack Based on Probability Distribution of Service Life

Jung

Yang

et al. 2018

Int J Concr Struct Mater

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Chloride attack is one of the most critical deterioration due to rapid corrosion initiation and propagation which can cause structural safety problem. Extended service life through repairing is very important for determination of maintenance strategy. Conventionally adopted models for estimation of life cycle cost have shown step-shaped elevation of cost, however the extension of service life is much affected by quality of construction and repairing materials, which means engineering uncertainties in residual service life. In the paper, reinforced concrete column with three different mix proportions exposed to chloride attack are considered, and repairing numbers with related costs are evaluated through probabilistic technique for maintenance. With a given exposure condition, service lives with normal probabilistic distribution are considered, and the effect of design parameters such as coefficient of variation of service life and 1st repairing timing are investigated. The comparison of results from conventional approach (step-function) and probabilistic approach are performed. When calculating repair frequency for intended service life through probabilistic model, the required repair frequency is evaluated to be 6.71 times for OPC, 4.09 times for SG30, and 2.95 times for SG50, respectively. The probabilistic model for repairing cost is evaluated to be effective for reducing the repair frequency reasonably with changing the intended service life and design parameters.

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“…The approaches for the durability design of concrete in a high saline environment are based on factors such as the water-to-cement ratio, concrete strength and minimum values for unit cement content [2,3]. These are essential factors for the service life design of the concrete because the properties considered in most standards and codes for concrete durability [2,3] are related to the permeability of concrete and are influenced by the porosity, particularly the capillary pores. Thus, it is essential to reduce the capillary pore size or to increase the tortuosity of the cement matrix for the reduction of chloride transportation.…”

Section: Introductionmentioning

confidence: 99%

Chloride Resistance of Portland Cement-Based Mortar Incorporating High Aluminate Cement and Calcium Carbonate

2020

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Whether chloride resistance is highly influenced by chloride binding capacity remains unknown. In this study, the chloride resistance of Portland cement-based mortar incorporating aluminate cement and calcium carbonate was investigated considering the chloride binding capacity, pore structures and chloride diffusion coefficient from non-steady state chloride migration and natural chloride diffusion. The cement hydrates were investigated using X-ray diffraction and thermogravimetric analysis. The chloride binding capacity was evaluated based on the chloride adsorption from the solutions using the adsorption isotherm. The aluminate cement, as an available alumina source, can stimulate the formulation of layered double hydroxides, which in turn can increase the chloride binding capacity. The results of mercury intrusion porosimetry show that non-substituted (control) and substituted (only aluminate cement) specimens have capillary pore volume 8.9 vol % and 8.2 vol %, respectively. However, the specimen substituted with aluminate cement and calcium carbonate shows a higher capillary volume (12.9 vol %), which correlates with the chloride diffusion coefficient. Although the specimen substituted with calcium carbonate has a higher chloride binding capacity than the control, it does not necessarily affect the decrease in the chloride diffusion coefficient. The capillary pore volume can affect not only the chloride diffusion but also the chloride adsorption.

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Current Trends of Durability Design and Government Support in South Korea: Chloride Attack

Cited by 10 publications

References 37 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

Maintenance for Repaired RC Column Exposed to Chloride Attack Based on Probability Distribution of Service Life

Chloride Resistance of Portland Cement-Based Mortar Incorporating High Aluminate Cement and Calcium Carbonate

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