Chloride profile modeling contemplating the convection zone based on concrete structures present for more than 40 years in different marine aggressive zones

Balestra, Carlos Eduardo Tino; Reichert, Thiago Alessi; Pansera, Wagner Alessandro; Savaris, Gustavo

doi:10.1016/j.conbuildmat.2018.11.271

Cited by 56 publications

(15 citation statements)

References 32 publications

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“…Wang et al (2019a) proposed a semi-empirical prediction model of chloride-induced corrosion for application in uncracked reinforced concrete. Balestra et al (2019b) recently presented the modified Holliday equation in order to model chloride profiles (equation (2)) of field naturally degraded structures that present a sharp peak of maximum concentration, contemplating the convection and diffusion zones…”

Section: Chloride Penetration In Concretementioning

confidence: 99%

“…Balestra et al (2019b) recently presented the modified Holliday equation in order to model chloride profiles (equation (2)) of field naturally degraded structures that present a sharp peak of maximum concentration, contemplating the convection and diffusion zones…”

Section: Introductionmentioning

confidence: 99%

“…Some studies have also determined C s by fitting the profiles of chlorides on Fick’s law (Medeiros-Junior et al, 2015; Wang et al, 2014). However, this practice has been questioned in the literature, because it results in an extrapolation of C s and ignores the peak of chlorides (Andrade et al, 1997; Ann et al, 2009; Balestra et al, 2019b). The main reason for this article is trying to relate C s with k Cl values that were previously determined for different marine environments.…”

Section: Introductionmentioning

confidence: 99%

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Study of the environment factor from Fick’s and electrical resistivity models by simulation of chloride diffusivity prediction

Medeiros-Junior

Diogo

2020

Advances in Structural Engineering

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The penetration of chlorides in concrete is the main reason for the beginning of corrosion in reinforced concrete structures exposed to a marine environment, reducing their service life. This article proposes correlations between the surface chloride content ( Cs) of Fick’s model and the ambient factor ( kCl) of a resistivity model. Literature data for three types of cement were used to simulate chloride diffusivity: (1) CEM I 52.5 R; (2) CEM II/A-P 42.5 R (with 6%–20% of pozzolans); and (3) CEM type II (with 12% of pozzolans and 8% of silica fume). Concretes containing these cements were analyzed for different environmental conditions: atmosphere zone, seawater immersion, and tidal/splash zones. The surface chloride contents were determined by a combination of Fick’s and resistivity models. In this article, it was noticed that the estimated Cs value varies with the exposure class from 0.484% to 0.644% (total chloride concentration by weight of cement). An equation has been proposed to correlate Cs with the ambient factor kCl of the resistivity model.

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Section: Chloride Penetration In Concretementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study of the environment factor from Fick’s and electrical resistivity models by simulation of chloride diffusivity prediction

Medeiros-Junior

Diogo

2020

Advances in Structural Engineering

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“…This can be due to the driving force in a concentration gradient [63,64]. Additionally, the diffusion coefficient using the Holliday equation (D h ) (Equation (11)) was investigated [67] to support the previous interpretation regarding D a and D i . It was proposed to consider the convection zone.…”

Section: Chloride Migration and Natural Diffusionmentioning

confidence: 85%

Chloride Resistance of Portland Cement-Based Mortar Incorporating High Aluminate Cement and Calcium Carbonate

2020

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Whether chloride resistance is highly influenced by chloride binding capacity remains unknown. In this study, the chloride resistance of Portland cement-based mortar incorporating aluminate cement and calcium carbonate was investigated considering the chloride binding capacity, pore structures and chloride diffusion coefficient from non-steady state chloride migration and natural chloride diffusion. The cement hydrates were investigated using X-ray diffraction and thermogravimetric analysis. The chloride binding capacity was evaluated based on the chloride adsorption from the solutions using the adsorption isotherm. The aluminate cement, as an available alumina source, can stimulate the formulation of layered double hydroxides, which in turn can increase the chloride binding capacity. The results of mercury intrusion porosimetry show that non-substituted (control) and substituted (only aluminate cement) specimens have capillary pore volume 8.9 vol % and 8.2 vol %, respectively. However, the specimen substituted with aluminate cement and calcium carbonate shows a higher capillary volume (12.9 vol %), which correlates with the chloride diffusion coefficient. Although the specimen substituted with calcium carbonate has a higher chloride binding capacity than the control, it does not necessarily affect the decrease in the chloride diffusion coefficient. The capillary pore volume can affect not only the chloride diffusion but also the chloride adsorption.

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“…Mediante a problemática exposta, o presente trabalho analisa a resistividade elétrica de estruturas de concreto presentes em diferentes zonas de agressividade marinha, que permaneceram a mais de 40 anos sob degradação natural na Ilha dos Arvoredos, Guarujá, São Paulo, Brasil. Construídas entre 1950 e 1974 com o objetivo de subsidiar pesquisas nas áreas relacionadas à Biologia, essas estruturas foram analisadas, em 2016, quanto à problemática da corrosão de armaduras em estruturas presentes no ambiente marinho, ocasião nas quais, diversas medidas de resistividade foram realizadas (BALESTRA et al, 2019a). Com este trabalho, espera-se contribuir para um melhor entendimento acerca da resistividade elétrica superficial em estruturas reais de concreto presentes nas diferentes zonas de agressividade marinha, utilizando, para tanto, parâmetros normativos internacionais.…”

Section: Introductionunclassified

Resistividade elétrica em estruturas de concreto presentes em ambiente marinho: Estudo de caso da Ilha dos Arvoredos

Reichert¹,

Balestra²,

Bressiani³

et al. 2021

Congresso Internacional Sobre Patologia E Reabilitação Das Construções

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Chloride profile modeling contemplating the convection zone based on concrete structures present for more than 40 years in different marine aggressive zones

Cited by 56 publications

References 32 publications

Study of the environment factor from Fick’s and electrical resistivity models by simulation of chloride diffusivity prediction

Study of the environment factor from Fick’s and electrical resistivity models by simulation of chloride diffusivity prediction

Chloride Resistance of Portland Cement-Based Mortar Incorporating High Aluminate Cement and Calcium Carbonate

Resistividade elétrica em estruturas de concreto presentes em ambiente marinho: Estudo de caso da Ilha dos Arvoredos

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Chloride profile modeling contemplating the convection zone based on concrete structures present for more than 40 years in different marine aggressive zones

Cited by 56 publications

References 32 publications

Study of the environment factor from Fick’s and electrical resistivity models by simulation of chloride diffusivity prediction

Study of the environment factor from Fick’s and electrical resistivity models by simulation of chloride diffusivity prediction

Chloride Resistance of Portland Cement-Based Mortar Incorporating High Aluminate Cement and Calcium Carbonate

Resistividade elétrica em estruturas de concreto presentes em ambiente marinho: Estudo de caso da Ilha dos Arvoredos

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Chloride profile modeling contemplating the convection zone based on concrete structures present for more than 40 years in different marine aggressive zones