service life of chloridecontaminated concrete

Service Life of Chloride-Contaminated Concrete

concrete infrastructure over a required service life of 100 years where chloride-rich environments are experienced. The use of secondary cementitious materials in concrete, including the waste materials Pulverised Fuel Ash (pfa) and Ground Granulated Blastfurnace Slag (ggbs), may enhance the resistance of the concrete to the chloride ingress.

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[PDF] Service Life of Chloride-Contaminated Concrete ...

Corrosion of reinforcement is the most significant cause of premature deterioration of reinforced concrete structures. The problem is particularly acute where corrosion is initiated by chloride ingress, for example in coastal environments and in highway structures subjected to the application of de-icing salts. Concern has been expressed in technical journals at the apparent inability of ...

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Service Life Projection for Chloride-Exposed Concrete ...

Jun 01, 2012  This leads, in turn, to concrete cracking and spalling and reduced service life. Of these two causes for passivity loss, damage resulting from chlorides is generally more pervasive, particularly for port and harbor structures that are invariably exposed to sea or brackish waters.

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Enhancing the service life of concrete exposed to chloride ...

However, for 50PC50GGBS concrete (with increasing chloride diffusion coefficient caused by ECE treatment), only 3%-4% increase of the total service life was found due to the ECE treatment. Both ECE and SC (Silane with 50 years working life) treatments can offer extension of service life to maximum of 1.3-2.2 times, and minimum of 1.2-1.3 times.

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Service Life Prediction of Underground Concrete Pipeline ...

10%  May 04, 2018  Abstract. This paper develops a theoretical model to predict the service life of concrete pipelines in contaminated soils. The service life of concrete pipeline is divided into four stages: the chloride ion diffusion stage, the initial corrosive stress generation stage, the initial crack generation stage and the crack propagation stage.

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ECL030 Service Life of Chloride-Contaminated Concrete - Ecocem

0 Version 54 Download 0.00 KB Dateigrösse 1 Datei-Anzahl November 29, 2018 Erstellungsdatum November 29, 2018 Zuletzt aktualisiert ECL030 Service Life of Chloride-Contaminated Concrete DateiAktionECL030 Service Life of Chloride Contaminated []

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Service Life Design of Concrete Elements

– Service life design of concrete elements: ... by chloride ingress from the surface, but can also be due to chloride contaminated aggregates, cements or water used for the concrete production. The total amount of chlorides present in the concrete mix will be determined during

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A Corrosion Model for prediction of Service Life of ...

The aim of this research was to develop a service life model to for prediction of the service life of reinforced concrete water conveyancing structures. To achieve the desired objective, steel samples were cast in concrete of characteristic strength of 25N/mm 2 , 9 cylinders each of 150mm

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Theoretical approach for prediction of service life of RC ...

Dec 20, 2019  The service life of corrosion stage only decreases by 0.0024 year when the crack width increases from 30 mm to 270 mm for the case D c = C. Also, the service life of corrosion stage only decreases by 0.0018 year when crack depth increases from 0 C to 1.0 C for the case W c = 180 μ m. Download : Download high-res image (162KB)

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Service Life of Chloride-Contaminated Concrete Structures

Find the training resources you need for all your activities. Studyres contains millions of educational documents, questions and answers, notes about the course, tutoring questions, cards and course recommendations that will help you learn and learn.

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

We present a 1D numerical service-life model for recycled aggregate (RA) concrete. The model accounts for both normal and chloride-contaminated RAs. RA concretes modeled herein ranged in service life from 10 to 80 years. Location and exposure conditions most affect service life

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Service Life Projection for Chloride-Exposed Concrete ...

Jun 01, 2012  This leads, in turn, to concrete cracking and spalling and reduced service life. Of these two causes for passivity loss, damage resulting from chlorides is generally more pervasive, particularly for port and harbor structures that are invariably exposed to sea or brackish waters.

get price

Enhancing the service life of concrete exposed to chloride ...

However, for 50PC50GGBS concrete (with increasing chloride diffusion coefficient caused by ECE treatment), only 3%-4% increase of the total service life was found due to the ECE treatment. Both ECE and SC (Silane with 50 years working life) treatments can offer extension of service life to maximum of 1.3-2.2 times, and minimum of 1.2-1.3 times.

get price

ECL030 Service Life of Chloride-Contaminated Concrete - Ecocem

0 Version 54 Download 0.00 KB Dateigrösse 1 Datei-Anzahl November 29, 2018 Erstellungsdatum November 29, 2018 Zuletzt aktualisiert ECL030 Service Life of Chloride-Contaminated Concrete DateiAktionECL030 Service Life of Chloride Contaminated []

get price

Service Life Prediction of Underground Concrete Pipeline ...

May 04, 2018  Abstract. This paper develops a theoretical model to predict the service life of concrete pipelines in contaminated soils. The service life of concrete pipeline is divided into four stages: the chloride ion diffusion stage, the initial corrosive stress generation stage, the initial crack generation stage and the crack propagation stage.

get price

Service Life Design of Concrete Elements

– Service life design of concrete elements: ... by chloride ingress from the surface, but can also be due to chloride contaminated aggregates, cements or water used for the concrete production. The total amount of chlorides present in the concrete mix will be determined during

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Service Life Modeling in Propagation Phase of Corrosion in ...

Apr 14, 2020  Liu, Y.: Modeling the time-to-corrosion cracking of the cover concrete in chloride contaminated reinforced concrete structures (1996) Google Scholar 3. Alonso, C., Andrade, C., González, J.A.: Relation between resistivity and corrosion rate of reinforcements in carbonated mortar made with several cement types.

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A Corrosion Model for prediction of Service Life of ...

The aim of this research was to develop a service life model to for prediction of the service life of reinforced concrete water conveyancing structures. To achieve the desired objective, steel samples were cast in concrete of characteristic strength of 25N/mm 2 , 9 cylinders each of 150mm

get price

EXTENDING THE LIFE OF CONCRETE STRUCTURES – THE

techniques and the long-term benefits in relation to service life, cost and environment warrant serious consideration in the pursuit of working towards a more sustainable future in our buildings and other structures. BACKGROUND It is unrealistic to expect a 50 or 100 year service life from any concrete or steel civil structure

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Extending the Service Life of a Reinforced Concrete ...

Reinforced concrete structures can be designed and maintained to achieve long service lives, even in aggressive chloride environments. Unfortunately, many structures, such as bridges, piers, and wharves, show signs of active corrosion (e.g. rust staining, concrete spalling, etc.) in as little as 5 to 10 years.

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Journal Advances in Modeling Concrete Service Life

Determination of the probable failure mechanisms and service life of offshore concrete gravity structures in the OSPAR Maritime Area - research proposal Rod

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Effect of carbonation on release of bound chlorides in ...

Note that in the service life prediction of a concrete structure it is necessary to distinguish the free and bound chlorides due to the retardation effect of bound chlorides (Mangat and Molloy, 1995). If the release of bound chlorides due to concrete carbonation were ignored in the prediction model, the service life predicted would be ...

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Bridges for Service Life Beyond 100 Years: Innovative ...

the service life is provided, followed by strategies used to mitigate them. This chapter forms the basis for materials ... concrete bridges Chloride Contaminated Concrete Fe Fe2+ + 2e-Fe2+ + 2Cl-FeCl 2 2Fe(OH) 2 + 1/ 2 O 2 Fe 2 O 3 + 2H 2 O 2e-FeCl 2 + 2OH-Fe(OH) 2 + 2Cl-2OH-1/ 2 O 2 + H 2 O + 2e

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Service Life of Chloride-Contaminated Concrete Structures

Find the training resources you need for all your activities. Studyres contains millions of educational documents, questions and answers, notes about the course, tutoring questions, cards and course recommendations that will help you learn and learn.

get price

Service Life Prediction of Underground Concrete Pipeline ...

May 04, 2018  Abstract. This paper develops a theoretical model to predict the service life of concrete pipelines in contaminated soils. The service life of concrete pipeline is divided into four stages: the chloride ion diffusion stage, the initial corrosive stress generation stage, the initial crack generation stage and the crack propagation stage.

get price

Service Life Design of Concrete Elements

– Service life design of concrete elements: ... by chloride ingress from the surface, but can also be due to chloride contaminated aggregates, cements or water used for the concrete production. The total amount of chlorides present in the concrete mix will be determined during

get price

PREVENT reinforced concrete corrosion, OPTIMIZE service life!

PREVENT reinforced concrete corrosion, OPTIMIZE service life! ... Galvanic anodes are particularly suited for use in repairs in either chloride-contaminated or carbonated concrete when it is impossible to be certain that all contaminated concrete has been removed i.e. whenever there is a high likelihood of the formation of ring anode induced ...

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Service life of hot-dip galvanised reinforcement ... - CORE

In carbonated intact and cracked concrete the use of hot-dip galvanised reinforcement bars could double the service life compared with the use of ordinary steel reinforcement bars. In chloride-contaminated intact concrete the service life as a result of using hot-dip galvanised reinforcement bars is 3-5 times longer compared with ordinary steel ...

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Extending the Service Life of a Reinforced Concrete ...

Reinforced concrete structures can be designed and maintained to achieve long service lives, even in aggressive chloride environments. Unfortunately, many structures, such as bridges, piers, and wharves, show signs of active corrosion (e.g. rust staining, concrete spalling, etc.) in as little as 5 to 10 years.

get price

EXTENDING THE LIFE OF CONCRETE STRUCTURES – THE

techniques and the long-term benefits in relation to service life, cost and environment warrant serious consideration in the pursuit of working towards a more sustainable future in our buildings and other structures. BACKGROUND It is unrealistic to expect a 50 or 100 year service life from any concrete or steel civil structure

get price

Bridges for Service Life Beyond 100 Years: Innovative ...

the service life is provided, followed by strategies used to mitigate them. This chapter forms the basis for materials ... concrete bridges Chloride Contaminated Concrete Fe Fe2+ + 2e-Fe2+ + 2Cl-FeCl 2 2Fe(OH) 2 + 1/ 2 O 2 Fe 2 O 3 + 2H 2 O 2e-FeCl 2 + 2OH-Fe(OH) 2 + 2Cl-2OH-1/ 2 O 2 + H 2 O + 2e

get price

Effect of carbonation on release of bound chlorides in ...

Note that in the service life prediction of a concrete structure it is necessary to distinguish the free and bound chlorides due to the retardation effect of bound chlorides (Mangat and Molloy, 1995). If the release of bound chlorides due to concrete carbonation were ignored in the prediction model, the service life predicted would be ...

get price

Journal Advances in Modeling Concrete Service Life

Determination of the probable failure mechanisms and service life of offshore concrete gravity structures in the OSPAR Maritime Area - research proposal Rod

get price

Shenzhen University, Shenzhen, Guangdong Province, P.R ...

influence on the service life of RC structures is analyzed. Factors affecting the time to corrosion initiation are described with regard to both concrete properties and environmental exposure conditions. Design approaches available for achieving durability targets associated with the design service life

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Extended Corrosion Performance of Impregnation-Treated ...

overlaying with a low-permeable concrete. These decks have a limited service life of 22 to 26 years, regardless of the chloride exposure category-low to severe (1, 2). The cause of the limited service life is the amount of critically chloride contaminated concrete left in place, which is rel­

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Chloride Penetration Resistance and Link to Service Life ...

service life design in Virginia • Questions remain about critical variables (aging coefficient and surface chloride concentration) • Low-cracking concrete and corrosion-resistant rebar (+ appropriate cover depths) can achieve 100-year service life 46

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Discrete sacrificial anodes and their use in service life ...

Arito P. Discrete sacrificial anodes and their use in service life extension of chloride contaminated reinforced concrete structures. [Thesis]. University of Cape Town ,Faculty of Engineering the Built Environment ,Department of Civil Engineering, 2012 [cited yyyy month dd].

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