Development of Simulation Model of Chloride Ion Transportation in Cracked Concrete

Kato, Erna; Kato, Yoshitaka; Uomoto, Taketo

doi:10.3151/jact.3.85

Cited by 55 publications

(28 citation statements)

References 5 publications

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“…1 and 2 and Table 4. That is, it is thought that the penetration of the chloride ion or the carbon dioxide is difficult in HPFRCC compared to normal mortar, because the depth of the crack is shallow and the width is narrow (Kato et al 2005). Figures 18 to 21 show examples of the experimental results.…”

Section: Resultsmentioning

confidence: 95%

Durability against Steel Corrosion of HPFRCC with Bending Cracks

Miyazato

Hiraishi²

2013

ACT

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High Performance Fiber Reinforced Cementitious Composites (HPFRCC) develop micro-cracks under bending load. This study clarifies durability against steel corrosion in HPFRCC. Specimens made of HPFRCC or normal mortar with cracks were cured in a chloride or CO 2 environment and chloride ingress or carbonation progress was evaluated. The corrosion cell formation pattern and rate were also compared between HPFRCC and normal mortar, and their mechanism was discussed. The multiple cracks in HPFRCC were focused on in particular. It was found that chloride ingress and carbonation progress occur at many spots in HPFRCC, and that the advantage of HPFRCC against corrosion is due not only to the crack width but also the cracking pattern itself, which causes microcells instead of macrocells. From the above results, it was confirmed that the durability of HPFRCC against chloride or carbonation induced corrosion is higher than that of normal mortar.

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Section: Resultsmentioning

confidence: 95%

Durability against Steel Corrosion of HPFRCC with Bending Cracks

Miyazato

Hiraishi²

2013

ACT

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“…In order to accurately predict the service life of RC structures suffering from chloride attack, it is necessary to quantify the chloride penetration process in concrete. To fulfill this goal, extensive research has been conducted by previous researchers to investigate the concrete chloride diffusivity, which is commonly regarded as one of most important parameters affecting the structural durability (Bentz and Thomas 2001;Kato et al 2005;Wang and Ueda 2011;Ye et al 2013Ye et al , 2015. Basically, chloride penetration in saturated concrete is facilitated by the network of interconnected pores in concrete, as far as the chloride concentration gradient exists between the external exposed surface and the interior pore solution (Martın-Pérez et al 2001).…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Investigation of Loading Effects on Chloride Diffusion in Saturated Concrete

Jin

et al. 2015

ACT

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In this paper, a comprehensive investigation regarding the loading effects on chloride diffusion in saturated concrete is reported. It involves both theoretical and experimental aspects, towards contributing to the service-life prediction of infrastructure under chloride attack. A revised chloride diffusion model is proposed based on the modified Fick's second law with an emphasis on the loading effects. In particular, this influence is quantified using a newly-introduced damage effect factor defined by tortuosity and constrictivity of damaged concrete. This model is capable of predicting the chloride profiles in concrete under different loading states, regardless of whether it is damaged or undamaged. Meanwhile, a series of experimental studies were extensively operated in order to analyze the influence of loading on chloride diffusion process. Two types of mixtures (i.e. ordinary concrete and ordinary concrete mixed with slag) were investigated for chloride diffusion tests under different natures (i.e. compressive and tensile loads) and magnitudes of loads. Totally four levels of loads were applied to further correlate the relation between chloride diffusivities and associated strain values. Finally, two groups of test data with different tensile strain were adopted to validate the theoretical model. It shows that the model is reasonable and the numerical result is adequately accurate.

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“…It was pointed out that the maximum diffusion rate of chloride in a single crack approximated that diffusing in free bulk water (about 10 -9 m 2 /s) when the crack width was 80 μm or more. Based on the similar test method, Kato et al (2005) concluded that D cr increased with increases in the crack width and was almost constant when the crack width became wider than approximately 75 μm, but this constant diffusion coefficient was in a range of 10 -7~1 0 -6 m 2 /s, which was about 10 2~1 0 3 times higher than that in free water. In the simulation model of Takewaka et al (2003), if w cr is less than 50μm, the cracks seldom affect diffusivity, but when w cr is between 50 μm and 100 μm, D cr was set 10 times of the sound part, and when w cr is larger than 100 μm, D cr was set as 10 3 times of that of the sound part.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, there is no doubt that cracking of concrete can greatly affect the durability of reinforced concrete structures (Djerbi et al 2008). Thereafter, it seems very important to investigate the effect of cracking on the transport property of chlorides in concrete in order to allow more accurate prediction of durability and service life of concrete structures (Wang and Ueda 2009a;Wang et al 2008;Kato et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Mesoscale Modelling of the Chloride Diffusion in Cracks and Cracked Concrete

Wang

Ueda

2011

ACT

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In service, cracks or microcracks are usually present in concrete as a result of several mechanisms, for example the drying shrinkage, thermal gradients, freezing-thawing cycles, alkali-aggregate reaction and external loading. It has been realized that cracking can significantly accelerate the ingress of chlorides into concrete since it provides preferential flow channels and allow more chlorides to penetrate. But it is also believed that cracking plays an important role on the penetration speed of chloride. The objective of this paper is to quantify the diffusion coefficient of chloride through cracks of concrete with different crack widths by means of the mesoscale modelling method based on the available experimental results from literatures. In the numerical models, the position and opening width of cracks are artificially prescribed based on geometrical layout of the samples used in test. Additionally, the Voronoi diagram technique is adopted to discrete the domain of a specimen in order to reduce the mesh bias. On the Voronoi diagram, a randomly distributed lattice network is constructed to represent the transport process of chlorides. The range of investigated crack width is from 20 to 600 μm covering the data in experimental program. The diffusion coefficients of chloride through cracks of different width, D cr , are numerically determined by the trial and error method. It is concluded that chloride can penetrate into cracks with a much higher speed than that in free water. When the crack width is lager than a critical value, D cr is determined as 10000 mm 2 /h and independent of the crack width.

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Development of Simulation Model of Chloride Ion Transportation in Cracked Concrete

Cited by 55 publications

References 5 publications

Durability against Steel Corrosion of HPFRCC with Bending Cracks

Durability against Steel Corrosion of HPFRCC with Bending Cracks

Theoretical and Experimental Investigation of Loading Effects on Chloride Diffusion in Saturated Concrete

Mesoscale Modelling of the Chloride Diffusion in Cracks and Cracked Concrete

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