modeling of chloride ions penetration in cracked concrete

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Modeling of chloride ions penetration in cracked concrete ...

Jun 11, 2018  Penetration of chloride ions into concrete is one of the factors that can contribute to corrosion of rebar and consequently the strength of concrete structures as well as serviceability reduction. In this study, an experimental model was proposed to predict penetration of chloride ions into cracked concrete by performing non-destructive tests.

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Modeling of chloride ions penetration in cracked concrete ...

Jun 11, 2018  Penetration of chloride ions into concrete is one of the factors that can contribute to corrosion of rebar and consequently the strength of concrete structures as well as serviceability reduction. In this study, an experimental model was proposed to predict penetration of chloride ions into cracked concrete by performing non‐destructive tests.

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Model of chloride penetration into cracked concrete ...

Nov 01, 2012  In present work, a model describing the chloride ions penetration into cracked concrete subjected to cyclic drying–wetting condition is studied. Following conclusions can be obtained: (1) The transport of chloride ions in cracked zone is elaborated. The mechanism of ions transport in porous medium is supposed still valid for cracked zone.

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Modeling of chloride ions penetration in cracked concrete ...

Modeling of chloride ions penetration in cracked concrete structures exposed to marine environments ... an experimental model was proposed to predict penetration of chloride ions into cracked ...

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Modeling of Chloride Ions Diffusion in Cracked Concrete ...

Apr 26, 2012  Moreover, concrete structures are not always crack-free. Cracks with different widths and depths will reduce the cover thickness and accelerate the migration of chloride ions. So, it's significant to develop a model to predict the chloride diffusion depth in cracked concrete. In this research, the whole chloride diffusion process was divided ...

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(PDF) Modeling of Chloride Ions Diffusion in Cracked Concrete

Modeling of Chloride Ions Diffusion in Cracked Concrete . ... This paper presents the experimental and numerical results on the influence of cracks on chloride penetration in concrete structures ...

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Modeling of chloride ions penetration in cracked concrete ...

Modeling of chloride ions penetration in cracked concrete structures exposed to marine environments ... an experimental model was proposed to predict penetration of chloride ions into cracked ...

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A Simple Approach to Modeling Chloride Diffusion into ...

May 05, 2015  Up to now, several models of chloride ingress into concrete and cracked concrete have been proposed to simulate the chloride penetration. In the present paper, besides crack widths, crack depths were recognized as a key parameter affecting the chloride penetration depth. A short – term test of chloride diffusion was used to evaluate the influence of crack depths on the chloride penetration ...

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Modeling the Diffusion of Chloride Ion in Concrete Using ...

Jun 06, 2012  Modeling of Chloride Ions Diffusion in Cracked Concrete Earth and Space 2010: Engineering, Science, Construction, and Operations in Challenging Environments April 2012 Advances in Modeling of Rilem Tc-178 ''Testing and Modeling Chloride Penetration in Concrete''

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Damage model for simulating chloride concentration in ...

Nov 01, 2017  The fracture behavior of concrete is expressed by the damage model, and the penetration of chloride ions into concrete is modeled as diffusion in consideration of the extent of damage. After formulating the crack-propagation analysis with the damage model, the unsteady-diffusion analysis of chloride ions in consideration of damage is presented ...

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Lattice Mesoscale modelling of Chloride Penetration in ...

Jul 09, 2021  ABSTRACT Chloride ions penetrated into reinforced concrete member causes rebar corrosion and induces the volume expansion of the rebar and cracks of concrete cover. This study aims to predict the chloride ingress in the reinforced concrete member and its operational service life by using a lattice model. Concrete is considered at the mesoscale, which constitutes three phases: aggregates ...

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Modeling of Chloride Transport in Cracked Concrete: a 3-D ...

Cracks with different widths and depths will reduce the cover thickness and accelerate the migration of chloride ions. So, it’s highly desirable to develop a model to predict the chloride diffusion depth in cracked concrete while considering the real microstructure including cement, voids and aggregate.

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Mesoscale Modeling of Chloride Penetration in Unsaturated ...

Feb 02, 2013  Mesoscale Modeling of Chloride Penetration in Unsaturated Concrete Damaged by Freeze-Thaw Cycling. ... flow theory for capillary water absorption and chloride transport is employed to simulate the ingress of water and chloride ions into concrete. It is found that the water absorption and chloride penetration are substantially influenced by the ...

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(PDF) Advances in Modeling Concrete Service Life Erik ...

Prediction of chloride ion penetration into concrete is, therefore, an important issue, both in research and in practise. Many studies have been undertaken in order to quantify these effects, and several service life models have been proposed. Most of these studies have focused on determining transport properties of sound, uncracked concrete.

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Chloride Penetration - an overview ScienceDirect Topics

Chloride penetration refers to the depth to which chloride ions from the environment penetrate into the concrete. This can lead to corrosion in RCC structures, and thus study of chloride permeability is an important aspect that affects the durability of the concrete. Chloride ions transport mechanism is a complex system and possibly includes ...

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Prediction of chloride ions ingress in uncracked and ...

Besides penetration in the micro cracked area of concrete cover, the chloride ions also diffuse in its sound area. It is noted that there are still many random micro pore structures in sound area ...

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Simple Technique for Tracking Chloride Penetration in ...

to provide quantitative modeling of chloride diffusion in cracked concrete [3,14]. However these models do not take into account crack patterns and surface roughness, which leads to a considerable degree of overestimation when the model predictions are compared with the results of experimental tests.

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Modeling of the influence of transverse cracking on ...

Apr 01, 2013  When a rectangular crack of known width and depth is introduced into such a model, the user must supply the diffusion coefficient to be used in the crack, as a function of crack width for example , .Alternatively, as implemented in the present study, this diffusion rate could be assumed equal to that of chloride ions in free water, 1.8 × 10 −9 m 2 /s at 20 °C .

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Published in Cement and Concrete Composites 38, 65-74 ...

model [4], Garces Rodriguez and Hooton [5] have pointed out that transport of chloride ions in cracked concrete should be analyzed as a two-dimensional problem, with a simple Fickian one-dimensional analysis being insufficient. In this case, both the crack width and crack depth are significant parameters influencing the overall chloride ...

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Evaluation Technique of Chloride Penetration Using ...

Chloride ions induced into concrete cause a severe corrosion in ... various phenomena like enlarged diffusion and permeation due to cracks and cold joint are considered for quantitative modeling on chloride penetration ... and S.-H. Jung, “Analysis technique for chloride penetration in cracked concrete using equivalent diffusion and ...

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Published in Cement and Concrete Composites 38, 65-74 ...

model [4], Garces Rodriguez and Hooton [5] have pointed out that transport of chloride ions in cracked concrete should be analyzed as a two-dimensional problem, with a simple Fickian one-dimensional analysis being insufficient. In this case, both the crack width and crack depth are significant parameters influencing the overall chloride ...

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Modeling chloride transport in cracked concrete: a 3 D ...

1 Modeling chloride transport in cracked concrete: a 3-D image–based microstructure simulation Yang Lu1, Edward Garboczi2, Dale Bentz3, and Jeffrey Davis4 Abstract The prediction of the service life of concrete materials is difficult, mainly because of their

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Model of chloride penetration into cracked concrete ...

The transporting mechanism of chloride ions in porous medium is supposed still valid for cracked concrete. The advection part is simulated by moisture transport in rough cracks, modeled as a flux based on Poiseuille law considering crack width, crack surface roughness, tortuosity and capillary pores at crack surface.

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(PDF) Modeling of Chloride Transport in Cracked Concrete ...

Modeling of Chloride Transport in Cracked Concrete: A 3-D Image-Based Microstructure Simulation ... of cracking on chloride penetration into concrete. Moreover, we use COMOL to assign boundary ...

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Modeling the Diffusion of Chloride Ion in Concrete Using ...

Jun 06, 2012  Modeling of Chloride Ions Diffusion in Cracked Concrete Earth and Space 2010: Engineering, Science, Construction, and Operations in Challenging Environments April 2012 Advances in Modeling of Rilem Tc-178 ''Testing and Modeling Chloride Penetration in Concrete''

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Modeling of Chloride Transport in Cracked Concrete: a 3-D ...

Cracks with different widths and depths will reduce the cover thickness and accelerate the migration of chloride ions. So, it’s highly desirable to develop a model to predict the chloride diffusion depth in cracked concrete while considering the real microstructure including cement, voids and aggregate.

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Simple Technique for Tracking Chloride Penetration in ...

to provide quantitative modeling of chloride diffusion in cracked concrete [3,14]. However these models do not take into account crack patterns and surface roughness, which leads to a considerable degree of overestimation when the model predictions are compared with the results of experimental tests.

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Simulation of Chloride Diffusion in Cracked Concrete with ...

Effect of crack number on chloride penetration is shown in Figure 6. Figure 6 (a) shows geometry model. Crack width is 0.3 mm, crack depth is 10 mm, the distance between two cracks is 10 mm, and exposure period is 20 weeks. Figure 6 (b) shows the meshing of cracked concrete with two equal-width cracks.

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Chloride diffusivity in flexural cracked Portland cement ...

Sep 06, 2014  Then, the free chloride ion contents were determined by rapid chloride testing (RCT) method. Based on the proposed analytical models of chloride penetration in sound and cracked concrete subjected to dry-wet cycles, the apparent chloride diffusion coefficient and chloride diffusivity of concrete were discussed.

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Chloride Penetration - Remedial and Proactive Avoidance

Chloride Penetration - Remedial Measures. Reduce permeability; An engineer may employ several different methods to prevent or remedy corrosion induced by chloride intrusion. The simplest way to reduce corrosion is to increase the cover over rebar. Adding just an extra inch of concrete cover could double the life of a structure.

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Chloride Penetration through Cracks in High-Performance ...

Apr 02, 2012  3. Result and Discussion 3.1. Chloride Penetration through Cracks. Figure 6 represents the relative diffusivity of concrete with various sizes of coarse aggregate.The relative diffusivity of concrete with 16 mm tends to be higher than that of concrete with 8 mm, however, the trend is not significant. Although micro-cracks are concentrated at the surface of coarse aggregate, the cracks do

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Effect of Micro-Cracks on Chloride Ions Penetration of ...

Feb 28, 2007  The critical crack width in this study is designed for a threshold crack width, which contributes to the first variation of chloride diffusion coefficient in responsive to the existence of cracks. A simple solution is formulated to realize the quantifiable parameter, chloride diffusion coefficient for only cracked zone excluding sound concrete.

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Influence of Crack Width on Chloride Penetration in ...

Specifically, the chloride contents in all the cracked RC beams at the depth of the steel bar exceeded the threshold value of 0.15%. As the width of the cracks increased, the chloride concentration and penetration of the cracked concrete beam increased.

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Modeling the rapid chloride migration test for concrete ...

of concrete to chloride ion penetration. In order to facilita te fast chloride ingress, electrical volta ge (typically 10–60 V) is applied acr oss the concrete specimen.

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