Semi-empirical prediction model of chloride-induced corrosion rate in uncracked reinforced concrete exposed to a marine environment

2020 ◽  
Vol 331 ◽  
pp. 135376 ◽  
Author(s):  
Yuanzhan Wang ◽  
Chenxi Liu ◽  
Yuchi Wang ◽  
Qingmei Li ◽  
Bochen Yan
Keyword(s):  
Reinforced Concrete ◽  
Corrosion Rate ◽  
Prediction Model ◽  
Marine Environment ◽  
Empirical Prediction ◽  
Chloride Induced Corrosion ◽  
Semi Empirical

scholarly journals Electrochemical Meaning of Cumulative Corrosion Rate for Reinforced Concrete in a Tropical Natural Marine Environment

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Pedro Castro-Borges ◽  
Mercedes Balancán-Zapata ◽  
Alexia Zozaya-Ortiz
Keyword(s):  
Reinforced Concrete ◽  
Corrosion Rate ◽  
Marine Environment ◽  
Plain Concrete ◽  
Portland Cement Concrete ◽  
Linear Polarization Resistance ◽  
Reinforcing Bar ◽  
Concrete Cylinders ◽  
The Common ◽  
The Right

The objective of this paper is to discuss the meaning of cumulative corrosion rate (iCCR) of reinforced concrete in a tropical marine microclimate of the Yucatan Peninsula identifying four stages that correspond to passivation, beginning of depassivation, breakdown and formation of subsequent corrosion layers, and nucleation and development of cracks. Sixty Portland cement concrete cylinders were exposed in a tropical marine environment at 50 m from the seashore. One-half of the samples had a reinforcing bar embedded at the center of the sample (corrosion measurements) and the other half was made with plain concrete (chloride measurements). Five water/cement (w/c) ratios and three times of curing (CT) were tested representing the common practices of this region. The corrosion rate was monitored using the linear polarization resistance technique (Rp) which enables calculating the apparent and cumulative corrosion rate. Representative results indicated that iCCR was effective not only to detect the beginning and duration of the reported stages but also to find the right influence of CT and w/c ratios on the corrosion performance of reinforced concrete.

scholarly journals Cracks width-corrosion rate correlation on the durability of reinforced concrete in a very high aggressiveness tropical marine environment

2018 ◽  
Vol 8 (3) ◽  
pp. 317-332
Author(s):  
Andrés Antonio Torres Acosta ◽  
Oladis Troconis de Rincón ◽  
Valentina Milano ◽  
Yolanda Hernández-López
Keyword(s):  
Reinforced Concrete ◽  
Corrosion Rate ◽  
Marine Environment ◽  
Surface Crack ◽  
Crack Propagation Rate ◽  
Test Site ◽  
Propagation Rate ◽  
Electrochemical Tests ◽  
One Year ◽  
Natural Test

The aim of this investigation was to evaluate the correlation between crack width and apparent corrosion rate in reinforced concrete specimens exposed for more than six years to a tropical marine environment, at the natural test site La Voz, Venezuela. Six specimens from DURACON Project (prismatic 15x15x60 cm, with 0.65 w/c ratio) were monitored; each specimen having six reinforcing steel bars placed at three different depths (two each at 15, 20, and 30 mm) for electrochemical tests (corrosion potential and corrosion rate). An empirical correlation between surface crack propagation rate and iCORR was established, which may help iCORR estimation indirectly if values of maximum surface crack widths due to reinforcement corrosion are obtained in at least one-year period of monitoring.

Corrosion Rate Evolution in Concrete Structures with Hydrophobic Agents Exposed to the Marine Environment

2011 ◽  
Vol 374-377 ◽  
pp. 1320-1324
Author(s):  
Wei Qun Cao ◽  
Hong Fan ◽  
Tie Jun Zhao
Keyword(s):  
Reinforced Concrete ◽  
Corrosion Rate ◽  
Marine Environment ◽  
Concrete Structures ◽  
Protective Layer ◽  
Chloride Penetration ◽  
Chloride Diffusion ◽  
Reinforced Concrete Structures ◽  
Chloride Diffusion Coefficient ◽  
Capillary Suction

In many cases, service life of reinforced concrete structures is severely limited by chloride penetration until the steel reinforcement. Today, concrete with high resistance with respect to chloride penetration can be produced by internal hydrophobic treatment. The aim of this study was to fill this gap in regards to reinforced concrete structures inserted in a marine environment. Results indicated the efficacy of the hydrophobic agents in cases where capillary suction is the mechanism of water penetration. However, when the transport mechanism is permeability this product is not advisable. Moreover, it was demonstrated that the chloride diffusion coefficient is reduced by the hydrophobic agents, and the corrosion rate of reinforcement could be well protected in the treated concrete with hydrophobic agents of silane. The durability of reinforced structures can be considerably increased and can be accurately designed by the application of an appropriate and optimized protective layer.

scholarly journals The Effect of Crack Width on Chloride-Induced Corrosion of Steel in Concrete

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Weiwei Li ◽  
Weiqing Liu ◽  
Shuguang Wang
Keyword(s):  
Reinforced Concrete ◽  
Corrosion Rate ◽  
Crack Width ◽  
Chloride Concentration ◽  
Working Environment ◽  
Thermal Shrinkage ◽  
Exposure Condition ◽  
Chloride Induced Corrosion ◽  
Cover Cracking ◽  
Percentage Concentration

When subjected to loading or thermal shrinkage, reinforced concrete structures usually behave in a cracking state, which raises the risk of bar corrosion from the working environment. The influence of cover cracking on chloride-induced corrosion was experimentally investigated through a 654-day laboratory test on cracked reinforced concrete specimens exposed to chloride solution. The concrete specimens have a dimension of 100 mm × 100 mm × 400 mm and a single prefabricated crack at the midspan. When the percentage concentration of chloride ion (0.6%, 1.2%, 2.1%, 3.0%, and 6.0%) and crack width (uncracked, 0.2, 0.3, 0.4, and 0.5 mm) are taken as variables, the experimental results showed that the corrosion rates for cracked specimens increased with increasing percentage concentration of chloride and increasing crack width. This study also showed the interrelationship between crack width and percentage concentration of chloride on the corrosion rate. In addition, an empirical model, incorporating the influence of the cover cracking and chloride concentration, was developed to predict the corrosion rate. This model allows the prediction of the maximum allowable wcr based on the given percentage concentration of chloride in the exposure condition.

scholarly journals Reinforced Concrete Bridge Deck Model Considering Delayed Exposure to Chlorides

2019 ◽  
Author(s):  
Petr Konečný ◽  
Petr Lehner ◽  
David Pustka
Keyword(s):  
Reinforced Concrete ◽  
Bridge Deck ◽  
Concrete Bridge ◽  
Reinforced Concrete Bridge ◽  
Corrosion Initiation ◽  
Chloride Induced Corrosion ◽  
Concrete Quality ◽  
Concrete Type ◽  
Concrete Bridge Deck ◽  
Delayed Exposure

The paper is focused on the model of the effect of delayed chloride exposure on the chloride induced corrosion initiation on ideal reinforced concrete bridge. The Finite Element-based numerical model is applied. The effect of concrete quality is expressed in the form of time dependent diffusion coefficient in order to evaluate the effect of concrete type as well as the effect of aging. The influence of extended chloride exposure on the corrosion initiation is introduced.

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