Simulation of Chloride Diffusivity for Cracked Concrete Based on RBSM and Truss Network Model

Wang, Licheng; Soda, Mitsutaka; Ueda, Tamon

doi:10.3151/jact.6.143

Cited by 66 publications

(32 citation statements)

References 29 publications

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“…In addition, the coarse aggregate is assumed to be non-diffusible, i.e., the diffusion coefficient of lattice elements falling in aggregate is set as 0. It has been revealed that D ITZ can be taken as 10 times of that of the mortar (Wang et al 2008). The average chloride profiles along three lines as shown in Fig.…”

Section: Application and Verification Of The Modelmentioning

confidence: 99%

“…Only an overview of the lattice network approach for modelling mass transport in concrete is given here. Additional details, such as those related to mesoscopic composite structure of concrete, Voronoi element construction and lattice element meshing method have been reported by Wang et al (2008) and Wang and Ueda (2011).…”

Section: Construction Of the Modelmentioning

confidence: 99%

“…The effect of ITZ usually plays a stronger role than that of the aggregates. This opposite impacting mechanism can be used to explain the statistic w cr =128μm w cr =60μm w cr =53μm w cr =21μm w cr =34μm finding that concrete usually has higher diffusion coefficient than that of mortar (Wang et al 2008).…”

Section: Diffusion Of Uncracked Concretementioning

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%

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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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Section: Application and Verification Of The Modelmentioning

confidence: 99%

Section: Construction Of the Modelmentioning

confidence: 99%

Section: Diffusion Of Uncracked Concretementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mesoscale Modelling of the Chloride Diffusion in Cracks and Cracked Concrete

Wang

Ueda

2011

ACT

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“…Cracks may be caused by mechanical load or by thermal and hygral gradients or by local swelling processes. Many authors have studied the influence of cracks on penetration of water and aggressive compounds into cement-based materials in the past (see for example, Jacobsen et al 1996;Aldea et al 1999;Win et al 2004;Kato et al 2005;Yang et al 2006;Wang et al 2008;Kanematsu et al 2009;Picandet et al 2009). Jacobsen et al (1996) studied the effect of freeze-thaw cycles on chloride transport into concrete and they found that internal cracking increased the chloride penetration rate by a factor of 2.5 to 8 when compared with undamaged specimens.…”

Section: Introductionmentioning

confidence: 99%

Influence of frost damage on water penetration into neat and air entrained concrete

Zhang¹,

Wang²,

Zhao³

et al. 2015

Proceedings of the Second International Conference on Performance-Based and Life-Cycle Structural Engineering (PLSE 2015)

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In service life, concrete can be damaged either by mechanical or environmental loads or by combined ones. These damages will strongly influence water movement in concrete which could later lead to more serious deteriorations. This paper applies neutron radiography to investigate the influence of frost damage on water penetration into concrete. In addition, the improvement of frost resistance by addition of air entrainment was investigated. The results indicate that it is possible to visualize penetration of water into the porous structure of concrete by neutron radiography. Further evaluation of the test data allows determining time-dependent moisture profiles quantitatively with high resolution. After concrete is damaged by freeze-thaw cycles water penetration into ordinary concrete is accelerated. It can be shown that frost damage is not equally distributed in specimens exposed to freeze-thaw cycles. Thermal gradients lead to more serious damage near the surface. The beneficial effect of air entrainment on frost resistance has been demonstrated. After 50 freeze-thaw cycles, air entrained concrete showed no measurable increase in water absorption. But layers near the surface of concrete absorbed slightly more water after 200 freeze-thaw cycles although the dynamic elastic modulus remained constant. Results presented in this paper help us to better understand mechanisms of frost damage of concrete.

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Effect of water‐to‐cement ratio on service life of reinforced concrete structures in chloride environment

Liang

Wang

2021

Structural Concrete

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Cracking of concrete induced by rebar corrosion is a main cause for deterioration of reinforced concrete structures especially for those exposed to chloride environment. In all of the parameters influencing the service life of concrete structures, water-to-cement ratio is a very important one for it determines the resistance of concrete against chloride aggression and corrosion-induced damage. In this paper, the parameters in corrosion process influenced by water-to-cement ratio of concrete (w/c) are screened all-round which include concrete tensile strength f t , elastic modulus E c , porous zone thickness δ 0 , corrosion current density i corr , critical chloride content C cr , and chloride diffusion coefficient D cl . The influences of w/c on the chloride penetration stage and the corrosion damage stage are studied. The first stage is expressed by Fick's second law, and the second stage is calculated using a commonly used analytical model, i.e. the thickwalled cylinder model. It is found that with the increase of w/c, the change of some parameters (f t ", C cr ", D cl #, i corr #) will induce increase of the service life, while the change of the others (E c ", δ 0 #) will induce decrease of the service life.The diffusion stage and damage stage both shorten with the increase of w/c, and thus the total service life decreases with the increase of w/c. These results show that the increase of w/c presents a negative effect on the service life of concrete structures in total. In addition, with the increase of w/c, the service life for various concrete cover thicknesses and rebar diameters decrease in a similar tendency. For probability analyses, it is found that the probability density curves under different w/c are almost symmetric but show a little left-skewed, and the total service life for various w/c fluctuates about 0.6 to 1.0 year.chloride diffusion, cover cracking, rebar corrosion, service life, water-to-cement ratio | INTRODUCTIONRebar corrosion is a serious problem affecting the durability and safety of reinforced concrete structures which reduces cross-section of rebar, bond strength between the corroded rebar and concrete and induces cracking of Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors' closure, if any, approximately nine months after the print publication.

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Simulation of Chloride Diffusivity for Cracked Concrete Based on RBSM and Truss Network Model

Cited by 66 publications

References 29 publications

Mesoscale Modelling of the Chloride Diffusion in Cracks and Cracked Concrete

Mesoscale Modelling of the Chloride Diffusion in Cracks and Cracked Concrete

Influence of frost damage on water penetration into neat and air entrained concrete

Effect of water‐to‐cement ratio on service life of reinforced concrete structures in chloride environment

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