Predicting Concrete CorrosionThe Effects of Chloride

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A Prediction Model for Concrete Cracks due to Chloride ...

A Prediction Model for Concrete Cracks due to Chloride-Induced Corrosion. Jiao Wang,1 Ling Li,1 X. G. Zhang,2 and Yangang Zhao3. 1Department of Architecture and

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Chloride-Induced Corrosion of Steel in Concrete: An ...

Abstract. Initiation of corrosion of steel in reinforced concrete (RC) structures subjected to chloride exposures mainly depends on coefficient of chloride

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Predicting Service Life of Steel-Reinforced Concrete ...

Basics of Chloride Ingress into Concrete In its abstract form, the problem of predicting the service life of reinforced concrete exposed to chloride ions seems

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Chloride-induced corrosion of steel in cracked concrete ...

Jan 01, 2016  Chloride-induced corrosion rate (i corr) prediction models for RC structures in the marine tidal zone that incorporate the influence of crack width (w cr), cover (c)

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Effect of Chloride-based Deicers on Reinforced Concrete ...

Nov 17, 2008  Agencies should be aware of the deleterious effects magnesium chloride deicers can pose on the concrete strength, even though the inhibited magnesium chloride

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Prediction model of chloride diffusion in concrete ...

Aug 20, 2019  To explore the coupling effects of coarse aggregate volume fractions and diameters of steel bar on chloride diffusion characteristics of concrete, the mixture

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Effect of Chloride Attack on Durability of Concrete ...

Effect of Corrosion: The increased volume of rust exerts pressure or thrust on the cover of the concrete, resulting in cracks, spalling or delamination as shown in

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Evaluating effect of chloride attack and concrete cover on ...

Dec 04, 2013  Wang H, Lu C, Jin W, Bai Y. Effect of external loads on chloride transport in concrete. Journal of Materials in Civil Engineering, 2011, 23(7): 1043–1049. Article

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Predicting Service Life of Steel-Reinforced Concrete ...

Basics of Chloride Ingress into Concrete In its abstract form, the problem of predicting the service life of reinforced concrete exposed to chloride ions seems to be simple and straightforward. Fick’s second law can be applied to describe the chloride ion concentration with time, t, and depth, y, as7 cy t

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Prediction models for chloride ingress and corrosion ...

PREDICTION MODELS FOR CHLORIDE INGRESS AND CORROSION INITIATION IN CONCRETE STRUCTURES Overview of PREDICTION MODELS FOR CHLORIDE INGRESS INTO CONCRETE STRUCTURES Lars-Olof Nilsson Different prediction models have a number of similarities and differences. They require different input data that look alike, but sometimes are quite different.

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Evaluation of Chloride Penetration Characteristics using a ...

Penetration of chloride ions is mainly preceded through diffusion in concrete. In general, the diffusion coefficient of concrete is used to decide the penetration speed of chloride ions. Diffusion coefficient has important meaning in point that it makes possible to predict the starting time of corrosion.

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PREDICTION OF CHLORIDE INGRESS IN STEEL FIBRE

chloride diffusion coefficient was used to predict the corrosion initiation of SFRC structures. The experimental results showed that SFRC had better chloride resistance than plain concrete, especially when specimens were under bending load. The chloride diffusion coefficient of SFRC under tension was 30 ~ 38 % lower than that of plain concrete.

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EFFECT OF CARBONATION, CHLORIDE AND SULPHATE

Verma et al. (2013) evaluated effect of chloride attack and concrete cover on the probability of corrosion. The authors describe chloride ions penetration in concrete structures as a significant threat to the durability of concrete structures. It has been revealed that in

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(PDF) CORROSION AND SERVICE LIFE PREDICTION OF

Electrical resistivities of the concrete increased with increasing admixed chloride content, and pH of the concretes was in a range from about 12 to 12. 5, regardless of the chloride content and ...

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(PDF) Prediction of Carbonation and Chloride Ingress in ...

Let us consider 1D transient problem of chloride ingress into concrete with an initially zero chloride 3 content " !# x C(x, t) = Cs 1 − erf p , (6) 2 Dm (t)f (w)t where Cs is the chloride content at surface in kgm−3 , Dm (t) is the mean (averaged) diffusion coefficient at time t in m2 s−1 , x is the position from the surface in m and f ...

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CARBONATION IN CONCRETE AND EFFECT ON STEEL

causes concrete cover spalls and other structural deterioration. The most common cause for steel passivity disruption in Florida highway structures is the presence of chloride ions in the concrete next to the reinforcing steel; the chloride ions penetrate from the external concrete surface in contact with seawater. Corrosion

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EFFECT OF CHLORIDE CONCENTRATION IN SOIL ON

crevice corrosion, the bottom of the bar and the concrete-air interface were coated with cement paste followed by an epoxy-based coating. In order to evaluate the effect of chloride concentration in soil on reinforcement corrosion, reinforced concrete specimens were exposed to soil with a chloride

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Effect of Chloride and Sulfate Contamination in Soils on ...

the effect of sabkhas on compressive strength. Concrete cyl­ inders 75 mm in diameter and 150 mm in height, with a cen­ trally embedded 12 mm reinforcing bar were used to inves­ tigate reinforcement corrosion. The steel bar was coated with an epoxy paint at the concrete-air interface and at it end, which wa embedded in concrete.

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Effect of Time-Dependent Chloride Profile and Temperature ...

Reinforcement corrosion due to chlorides diffusion is one of the main problems in reinforced concrete structures exposed to certain environments. The diffusion rate is function of chloride surface concentration, concrete temperature, humidity, composition and microstructure. The intruded chlorides are partially chemically bound by the concrete and it is the unbound or free chloride which upon ...

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Numerical Prediction of Chloride Penetration in Concrete ...

2.4. Input Parameters. To investigate the effects of the mix condition on the chloride penetration in nonsaturated concrete, 0.4, 0.5, and 0.6 of the water to cement ratio were considered by using each porosity and pore size distribution, which were determined based on the mercury intrusion porosimetry (MIP).For the MIP test, mortar specimens with 0.4, 0.5, and 0.6 of and 2.15 of the sand to ...

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Critical Review Of Corrosion Deterioration Models For ...

predict the time to activation of the corrosion process. ... The paper focuses on localised attack of reinforcing steel resulting from chloride contamination of the concrete cover. Three commonly used deterioration models are reviewed and an improved ... In order to take account of the localised nature of chloride-induced corrosion, the uniform ...

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The effect of chloride-induced steel corrosion on service ...

Chloride-induced corrosion is one of the most important deterioration mechanisms in reinforced concrete structures. This study presents detailed theoretical models for predicting service life of reinforced concrete structures exposed to chloride attack. Three stages are considered in the corrosion process: the diffusion period, the rust accumulation period and the crack propagation period.

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A Micro-mechanics Based Corrosion Model for Predicting the ...

prediction of RC structures due to chloride attack are simulated and the results of the analysis are compared with test the results. The effect of crack width the corrosion and the service life of the RC structures are analyzed and discussed. Keywords: reinforced concrete structures, corrosion, chloride ions, crack, service life 1.0 INTRODUCTION

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Evaluating effect of chloride attack and concrete cover on ...

Dec 04, 2013  Wang H, Lu C, Jin W, Bai Y. Effect of external loads on chloride transport in concrete. Journal of Materials in Civil Engineering, 2011, 23(7): 1043–1049. Article Google Scholar 8. Chai W, Li W, Ba H. Experimental study on predicting service life of concrete in the marine environment. Open Civil Eng J, 2011, 5: 93–99

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PREDICTION OF CHLORIDE INGRESS IN STEEL FIBRE

chloride diffusion coefficient was used to predict the corrosion initiation of SFRC structures. The experimental results showed that SFRC had better chloride resistance than plain concrete, especially when specimens were under bending load. The chloride diffusion coefficient of SFRC under tension was 30 ~ 38 % lower than that of plain concrete.

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CORROSION AND SERVICE LIFE PREDICTION OF

concrete, where the chloride concentration is much lower than that at the concrete surface. The diffusion of chlorides in concrete is a very slow and complex process. In general, the

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Concrete cracking due to chloride-induced reinforcement ...

Apr 05, 2012  (2012). Concrete cracking due to chloride-induced reinforcement corrosion – influence of steel–concrete interface defects due to the ‘top-bar effect’. European Journal of Environmental and Civil Engineering: Vol. 16, Probabilistic and predictive performance-based approaches for assessing reinforced concrete structures, pp. 402-413.

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SERVICE LIFE OF REINFORCED CONCRETE EXPOSED TO

The second stage developed mechanical and chloride permeability prediction equations for concrete containing MK. Finally, the third stage utilized probabilistic and extended finite element (XFEM) in predicting the corrosion periods for concrete containing MK. In the first stage, two corrosion testing methods were used to study the three corrosion

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Prediction of Chloride Penetration Depth Rate and ...

Feb 01, 2019  Concrete Mixture and Curing Conditions. Table 1 shows details of the concrete mixture, with coarse aggregate of 25 mm, w/c of 55%, and design strength of 27 MPa. Table 2 shows concrete curing conditions regarding sunlight exposure time and wind speed. The conditions were decided based on the examination of the last 10 year data from Korea Meteorological Administration (KMA) for Seoul,

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(PDF) Prediction of Chloride Ion Penetration of Recycled ...

A statistical analysis on the effect of incorporating increasing amounts of recycled aggregates of different type, size, and class on the chloride ion migration and total charge passed of concrete ...

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Critical Review Of Corrosion Deterioration Models For ...

predict the time to activation of the corrosion process. ... The paper focuses on localised attack of reinforcing steel resulting from chloride contamination of the concrete cover. Three commonly used deterioration models are reviewed and an improved ... In order to take account of the localised nature of chloride-induced corrosion, the uniform ...

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Determination of the concrete chloride diffusion ...

The chloride diffusion coefficient is an indication of the capacity of any type of concrete to resist chloride penetration and is used to predict the service life of reinforced concrete structures. Its determination has been subject of intense study in the last 50 years and today there is no complete agreement in the methodologies used.

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Predicting the Likelihood and Extent of Reinforced ...

Nov 11, 2005  A two-dimensional spatial time-dependent reliability model is developed to predict the likelihood and extent of corrosion-induced cracking. The spatial variability of concrete cover, concrete compressive strength, and surface chloride concentration

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Service Life Prediction of SFRC Corbels Subjected to ...

induced corrosions. Due to the importance of effect of corrosion, in this paper, an effort is made to determine the service life of steel fiber reinforced concrete (SFRC) corbels considering chloride-induced corrosion. The approach employed herein, is based upon

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Mechanism of reinforcement corrosion - cvut

[-] express the type of corrosion. For uniform corrosion the coefficient R corr equals 2. By the coefficient R corr also the effects of chloride concentration, pH level or other conditions may be described, whenever applicable. i corr is the current density (normally expressed in μA/cm2). For uniform corrosion, a mean value can be considered as 1

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Numerical service-life modeling of chloride-induced ...

1.1. Service-life prediction of recycled aggregate concrete Chloride-induced corrosion is one of the most common durabil-ity issues encountered by reinforced concrete structures. Labora-tory and modeling studies have consistently shown that the chloride permeability of recycled aggregate concrete

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