Accelerated carbonation tests for the probabilistic prediction of the durability of concrete structures

Duprat, Frédéric; Vu, Ngoc Tru; Sellier, Alain

doi:10.1016/j.conbuildmat.2014.05.103

Cited by 38 publications

(20 citation statements)

References 12 publications

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“…Badar et al [22] e Duprat et al [23] realizaram em seu estudo a carbonatação acelerada. Para isso tiveram que definir os níveis de CO2 que seriam utilizados no ensaio assim como o tempo de duração do teste.…”

Section: Carbonatação Aceleradaunclassified

“…Para isso tiveram que definir os níveis de CO2 que seriam utilizados no ensaio assim como o tempo de duração do teste. Duprat et al [23] utilizaram em seus experimentos um corpo de prova com relação a/c 0,72, e os submeteu a uma cura de 7 dias; depois da cura, preparou os corpos de prova por 28 dias em uma câmara com variáveis controladas. Badar et al [22] utilizaram uma relação a/a de 0,5 para um corpo de prova que curou por 72h.…”

Section: Carbonatação Aceleradaunclassified

“…Neste estudo, foi definido um nível de 5% de CO2 para um tempo de ensaio de 450 dias. Já Duprat et al [23] utilizaram um nível de dióxido de carbono mais alto, 50%, para um menor tempo de ensaio, 5 a 10 dias. A Tabela 4 resume os fatores dos ensaios de carbonatação.…”

Section: Carbonatação Aceleradaunclassified

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Corrosão acelerada uma revisão sobre os métodos de ensaio disponíveis

Monteiro¹,

Medeiros²

2017

Simpósio Paranaense De Patologia Das Construções

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Resumo: Estruturas de concreto armado estão sujeitas ao aparecimento de manifestações patológicas no decorrer do tempo. A corrosão é um processo de degradação e necessita de acompanhamento contínuo. Tentando prever o comportamento das estruturas frente a essa manifestação, os ensaios de corrosão acelerada são uma ferramenta de auxílio para obter resultados em um menor período de tempo, tendo em vista que o processo natural da corrosão geralmente leva anos para ocorrer. Os ensaios de corrosão acelerada não possuem um padrão dentro da comunidade científica. São realizados através de diversas metodologias, dificultando a comparação dos resultados. O objetivo desse artigo é apresentar e comparar as diferenças dos principais métodos nos ensaios de corrosão acelerada em corpos de prova de concreto armado. Em algumas das metodologias encontradas, foram utilizados corpos de prova submersos em solução salina, para aplicação de corrente elétrica externa, de modo que os cloretos migrem pelo efeito da diferença de potencial. Nesse caso, os autores divergem nas definições das concentrações e dos tipos de sais a serem dissolvidos na solução, e nas intensidades da corrente elétrica. Em outras metodologias são utilizado ciclos de molhagem e secagem na amostra, e também a inserção de sais no concreto fresco. Nesses casos é possível variar a porcentagem de íons cloretos, tempo dos ciclos de molhagem e secagem, e a concentração salina que o corpo de prova é submetido no processo de molhagem. Os ensaios podem se diferenciar pelas características do concreto armado ensaiado como traço, fator a/c e tipo de cimento. Palavras-chave: concreto armado, manifestação patológica, corrosão acelerada, métodos de ensaioAbstract: Reinforced concrete structures are subject to the appearance of pathological manifestations over time. Corrosion is an aggressive degradation process and requires continuous monitoring. Trying to predict the structure behavior of this manifestation, the accelerated corrosion tests are a support tool to get results in a shorter period of time, considering that the natural process of corrosion usually take years to occur. Accelerated corrosion tests do not have a standard within the scientific community. They are made through various methodologies, making it difficult a possible comparison of results. The purpose of this article is to introduce and compare the differences of the main methods for the testing of accelerated corrosion in reinforced concrete specimens. In some methodologies, test specimens are submerged in a saline solution for applying an external electric current, so that the chlorides migrate by effect of the potential difference. In this case, the authors differ from the definitions of concentrations and types of salts to be dissolved in the solution and intensity of electric current. In others methodologies are used a wetting and drying cycles in the sample and the inclusion of salt in the fresh concrete. In these cases, it is possible to vary the percentage of chloride ions, the time of the wetting and ...

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Section: Carbonatação Aceleradaunclassified

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Corrosão acelerada uma revisão sobre os métodos de ensaio disponíveis

Monteiro¹,

Medeiros²

2017

Simpósio Paranaense De Patologia Das Construções

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“…Corrosion modeling of reinforcing steel is one of the methods that has been gaining increasing interest in the last two decades [4,[26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41]. Modeling the corrosion process will allow the assessment of the current state of the existing RCS, improve the stability and help to extend the service life of RCS.…”

Section: Prediction Of the Service Life Of Rcsmentioning

confidence: 99%

Electrochemical Sensors for Monitoring the Corrosion Conditions of Reinforced Concrete Structures: A Review

Figueira¹

2017

Applied Sciences

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Several methods for corrosion monitoring of reinforced concrete structures (RCS) have been proposed in the last few decades. These systems may be used either in new, existing or repaired structures. The corrosion monitoring can be performed by different methodologies. These may or may not be destructive, use different degrees of complexity and cost, and provide information on the progression and kinetics of the corrosion phenomena. The destructive methods are limited to sampling. Therefore, these may not be representative of the whole structure, which is extremely important in RCS with large heterogeneities both in terms of materials used and in terms of the exposure environment. Within this context, non-destructive methods have been widely developed, which are intended to provide quick information about the entire structure. Ideally, these systems should be able to detect the corrosion state of the steel inside the concrete, the main causes of corrosion and the evolution of corrosion phenomena over time. This manuscript reviews and summarizes the actual state of the art and the main achievements in the field of electrochemical sensors based on non-destructive methods for corrosion monitoring of RCS in the last few years. The challenges and perspectives in this field will also be discussed.

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“…However, the limitation of this approach is that it did not account for the uncertainty in the carbonation process. Duprat, Vu & Sellier (2014) developed a probabilistic framework based on a BN approach to integrate the accelerated data for designing the cover of concrete structures under carbonation exposure. This study was based on a comprehensive carbonation model able to incorporate directly the accelerated data to improve lifetime assessment.…”

Section: Introductionmentioning

confidence: 99%

A Bayesian network framework for statistical characterisation of model parameters from accelerated tests: application to chloride ingress into concrete

Tran

Bastidas‐Arteaga

Schoefs

et al. 2017

Structure and Infrastructure Engineering

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This paper addresses the topic of long-term characterisation and probabilistic modelling of chloride ingress into reinforced concrete (RC) structures. Since the corrosion initiation stage may cover various decades, normal tests which simulate chloride penetration into concrete in laboratory conditions as the same as natural conditions, will require significant experimental times. Hence, long-term lifetime assessment of RC structures under chloride attack remains still a challenge. In practice this problem is solved through the use of accelerated tests which speed up the chloride ingress rate and provide valuable mid-and long-term information on the chloride penetration process. Nevertheless, this information cannot be directly used for parameter statistical characterisation if the equivalent times required in natural conditions to reach the same chloride concentrations in the accelerated tests are unknown. Consequently, this study proposes a novel iterative approach based on Bayesian network updating to estimate chloride ingress model parameters from the data obtained under accelerated laboratory conditions. The Bayesian Network structure and iterative approach are first tested with numerical evidences. Thereafter, the complete proposed methodology is verified with results from real experimental measurements. The results indicate that combining data from normal and accelerated tests significantly reduces the statistical characterisation error of model parameters.

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Accelerated carbonation tests for the probabilistic prediction of the durability of concrete structures

Cited by 38 publications

References 12 publications

Corrosão acelerada uma revisão sobre os métodos de ensaio disponíveis

Corrosão acelerada uma revisão sobre os métodos de ensaio disponíveis

Electrochemical Sensors for Monitoring the Corrosion Conditions of Reinforced Concrete Structures: A Review

A Bayesian network framework for statistical characterisation of model parameters from accelerated tests: application to chloride ingress into concrete

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