Consistent models for estimating chloride ingress parameters in fly ash concrete

Muthulingam, S.; Rao, B. N.

doi:10.1016/j.jobe.2015.04.009

Cited by 15 publications

(6 citation statements)

References 40 publications

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“…These constants are detailed in [7,10]. In the current study, binding isotherm constants are evaluated as follows [25]:…”

Section: Corrosion Process Modellingmentioning

confidence: 99%

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Space-time Gaussian models for evaluating corrosion-induced damages in reinforcing bars

Muthulingam

2019

Sādhanā

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Chloride-induced steel reinforcing bars corrosion is a problem of worldwide importance because, in addition to massive industrialization, a majority of human population inhabit marine atmosphere zones where salinity is the main source of built infrastructure deterioration. Reinforced concrete structures vulnerable to chloride-induced corrosion potentially experience two stages of damage, namely non-structural and structural. Till date, with regard to non-uniform corrosion, there is very limited information regarding the significant role played by the non-structural stage of damage in influencing the progression of structural damage. The present work examines the process of non-uniform chloride ingress into concrete due to the existence of the steel bars and its influence on the spatial and temporal variations in the depth of corrosion penetration. Mathematical models in the form of Gaussian functions are proposed to represent space-time variation in corrosion initiation, spatial spread of corrosion penetration depth and corroded bar morphologies, and are compared with literature data. A numerical inverse analysis procedure is introduced to predict space-time evolution of non-structural damage from experimentally observed spatial spread of structural damage. Further, applicability of superposition approach for the evaluation of corrosion-induced stresses around the steel-concrete interface of a corner reinforcing bar is explored and shown to introduce spatial and temporal errors while evaluating structural damages.

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“…These constants are detailed in [7,10]. In the current study, binding isotherm constants are evaluated as follows [25]:…”

Section: Corrosion Process Modellingmentioning

confidence: 99%

“…where g 1 and g 2 are fitting coefficients unique to each binding isotherm constant. In this work the values of j a L , j b L , j a F , and j b F are taken as 0.4621, 0.0799, 1.2354, and 0.3237, respectively [25]. Further, based on the theory of non-linear moisture diffusion, f h h ð Þ is given as [27]:…”

Section: Corrosion Process Modellingmentioning

confidence: 99%

Space-time Gaussian models for evaluating corrosion-induced damages in reinforcing bars

Muthulingam

2019

Sādhanā

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“…In addition, the chlorideinduced reinforcement corrosion can also significantly influence the durability of concrete structures [23,24]. Chloride ions normally exist in pore solution in the form of free ions or be bound by the hydrated product which could slow down the ingress of chlorides [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Dynamic Analysis of Corrosion Effect under to Chloride Induced in Reinforced Concrete Bridge Columns

Tangtakabi¹,

Ramesht²,

Pahlaviani³

et al. 2022

Preprint

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One of the influential factors in estimating the service life of reinforced concrete bridges (RCB) is determining the long-term seismic performance of these structures. Corrosion due to chloride ion diffusion leads to the destruction of critical members of the RCB during the useful life of the structure. So, the long-term seismic performance of the bridge deteriorates as a result. It is essential to study the effect of corrosion deterioration on the long-term seismic performance of bridges in the southern regions of Iran, near the coasts of the Persian Gulf and the Oman Sea, because of the seismicity of the region and high corrosion rate of reinforced concrete (RC) members is the result of environmental conditions. In order to investigate this issue, considering studies about environmental conditions of southern Iran, the onset time of corrosion in the columns, as seismic critical members of the bridge, was determined. Based on that, the corrosion's effect on characteristics of RC at specific time points during the bridge's useful life (0, 15, 30, 45, 60, 75 and 90 years) have been calculated. The effects of corrosion include deterioration of the core and cover concrete properties, steel bar and the connection between concrete and steel bar. In the next step, at each time point, according to the modified stress-strain relationships, the moment-curvature analysis of the bridge pier was done, and the properties of the plastic hinge were determined. Finally, based on the obtained data about plastic hinge characteristics at each time point, overload analysis of the bridge was performed in both longitudinal and transverse directions. Then the capacity curves of RCB were compared at the mentioned time-points. The results show that the capacity of the bridge deteriorates over time due to corrosion. Therefore, a proposal to increase the value of base shear design has been made to ensure the long-term seismic performance of RCB in corrosive environments.

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“…Entre os mecanismos de degradação que afetam a vida útil das estruturas de concreto armado, a corrosão de armaduras é um dos mais frequentes (BRANDÃO, 2007;MILANI;KRIPKA, 2012;MUTHULINGAM;RAO, 2015;PINTAN et al, 2015;SILVA;CABRAL, 2014;WEERDT et al, 2016), sendo responsável por grande parte dos danos nessas estruturas. Esses danos manifestam-se na forma de manchas superficiais, seguidas por fissuras, destacamento do concreto de cobrimento, redução da seção e perda de aderência das armaduras principais (RIBEIRO et al, 2014), podendo levar ao comprometimento da segurança estrutural ao longo do tempo (SHODJA; KIANI; HASHEMIAN, 2010).…”

Section: Introductionunclassified

Penetração de cloretos em concretos expostos em zona de atmosfera marinha por um período de 9 anos

2021

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Resumo A corrosão de armaduras é a manifestação patológica mais recorrente em estruturas de concreto armado, despertando maior preocupação em regiões litorâneas devido à presença de íons cloreto. Isso posto, destaca-se a carência de dados da concentração de cloretos de concretos em condição natural de exposição, principalmente na zona de atmosfera marinha. Dessa forma, este trabalho teve como objetivo avaliar os perfis de cloretos de blocos de concreto moldados com teores de substituição de sílica ativa de 5% (CP V_5SA) e 10% (CP V_10SA) quanto à massa de cimento e a relações a/agl de 0,45, 0,55 e 0,65. Os concretos permaneceram expostos em zona de atmosfera marinha por um período de 9 anos na cidade de Tramandaí, Rio Grande do Sul. Inicialmente, foram retiradas amostras pulverulentas dos blocos de concreto para posterior determinação da concentração de cloretos solúveis em água. No tocante à corrosão de armaduras, a utilização de teores de sílica ativa em percentuais de 5% e 10% é eficiente na redução do ingresso de cloretos; baixas relações a/agl apresentaram concentrações superficiais mais elevadas, em contrapartida, à medida que a profundidade em relação à superfície do concreto aumenta, há uma redução nesses teores. Além disso, o trabalho evidenciou que a redução da relação a/agl e a incorporação de sílica ativa se mostraram medidas eficazes na redução da concentração de cloretos ao longo do tempo.

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Consistent models for estimating chloride ingress parameters in fly ash concrete

Cited by 15 publications

References 40 publications

Space-time Gaussian models for evaluating corrosion-induced damages in reinforcing bars

Space-time Gaussian models for evaluating corrosion-induced damages in reinforcing bars

Investigation of Dynamic Analysis of Corrosion Effect under to Chloride Induced in Reinforced Concrete Bridge Columns

Penetração de cloretos em concretos expostos em zona de atmosfera marinha por um período de 9 anos

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