Diffusion of chloride ions in hardened cement pastes

Page, C.L.; Short, N. R.; Tarras, A. El

doi:10.1016/0008-8846(81)90111-3

Cited by 484 publications

(170 citation statements)

References 6 publications

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“…The penetration rate depends on the chloride concentration gradient. Page et al (1981) estimated the typical diffusion rates in fully saturated hydrated cement paste to be about 10.…”

Section: S2mentioning

confidence: 99%

Bond Deterioration of Reinforcing Steel in Concrete Due to Corrosion

Amleh¹,

Mirza²,

Ahwazi³

2002

Challenges of Concrete Construction: Volume 3, Repair, Rejuvenation and Enhancement of Concrete

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This manuscript has been reproduced tram the microfilm master. UMI films the text directly tram the original or copy submitted. Thus, sorne thesis and dissertation copies are in typewriter face, while others may be trom any type of computer printer.The quality of this reproduction is dependent upon the quallty of the copY submitted. Broken or indistinct print, colored or poor quality illustrations and photographs, print bleedthrough, substandard margins, and improper alignment can adversely affect reproduction.ln the unlikely event that the author did not send UMI a complete manuscript and there are missing pages, these will be noted. Also, if unauthorized copyright material had to be removed, a note will indicate the deletion.Oversize materials (e.g., maps, drawings, charts) are reproduced by sectioning the original, beginning at the upper left-hand corner and continuing trom left to right in equal sections with small overlaps.

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“…The penetration rate depends on the chloride concentration gradient. Page et al (1981) estimated the typical diffusion rates in fully saturated hydrated cement paste to be about 10.…”

Section: S2mentioning

confidence: 99%

Bond Deterioration of Reinforcing Steel in Concrete Due to Corrosion

Amleh¹,

Mirza²,

Ahwazi³

2002

Challenges of Concrete Construction: Volume 3, Repair, Rejuvenation and Enhancement of Concrete

View full text Add to dashboard Cite

show abstract

“…The obtained results demonstrate that, for a realistic mesoscale simulation, two distinct values of diffusivity need to be adopted for ITZ and bulk paste and these values cannot be deduced by the plain HCP behavior (as typically done in the practice [5,42,43]) because the diffusive behavior of the latter is different. Moreover, it is clear that ITZ and bulk paste behave differently from both binding and diffusive standpoints and, hence, different binding surfaces should be adopted.…”

Section: Results and Discussion 23mentioning

confidence: 95%

Towards multiscale modeling of the interaction between transport and fracture in concrete

2016

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Transport, fracture and their interaction in concrete are complex phenomena of great practical relevance for the durability of civil engineering structures. Due to the heterogeneous nature of the materials, encompassing a wide range of length scales, multiscale approaches are essential. In this paper, we outline some recent research results and open issues in this field. First, we present a microscale model which aims at simulating chloride diffusion and binding in cement. Then, we outline a mesoscale model addressing coupling between cracking and diffusion. Finally, we discuss open issues in the acquisition of the mesoscale geometry from X-ray computed tomography techniques.

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“…The thermal sensitivity of a reaction is indicated by the activation energy, which is the amount of energy required for a reaction to occur. Page et al [14] suggests values for diffusion activation energy in cement pastes of (41.8 + -4.0) kJ / mol, (44.6 + -4.3) kJ / mol and (32.0 + -2.4) kJ / mol for water/cement ratios of 0.4, 0.5 and 0.6, respectively. In order to mathematically model the temperature variation in the concrete, the developed software uses a sinusoidal function.…”

Section: ( 3 )mentioning

confidence: 99%

Computational modeling for predicting corrosion initiation in reinforced concrete structures

Dominicini

Gama

2017

Rev. IBRACON Estrut. Mater.

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ResumoThis article presents a model for penetration of chloride by diffusion in reinforced concrete structures based on the solution of the Fick's 2nd Law, using the finite element method (FEM) in two-dimensional domain. This model predicts the time, in a given situation, so that a certain limit of chlorides for depassivation of reinforcement is reached, characterizing the end of service life. Several approaches for the chloride surface concentration and for the diffusion coefficient are used, parameter which must be corrected due to the effects of temperature, solar radiation, exposure time, and relative humidity. Moreover, a parametric analysis is carried out in order to study the factors involved and their impact on the ingress of chlorides by diffusion, contributing to a better understanding of the phenomenon. In addition, the developed model is applied to the cities of Vitória (ES) and Florianópolis (SC) to analyze the service life for different concrete covers, making a comparison with the Brazilian standard.Keywords: chlorides, corrosion, diffusion, finite element method, service life.Este trabalho apresenta um modelo de penetração de cloretos por difusão em estruturas de concreto armado baseado na solução da 2ª Lei de Fick, utilizando o método dos elementos finitos (MEF) no domínio bidimensional. Este modelo prevê o tempo necessário, em determinada situação, para que um determinado limite de cloretos para a despassivação da armadura seja atingido, caracterizando o fim da vida útil. Utilizam-se diversas abordagens para a concentração superficial de cloretos e para o coeficiente de difusão, parâmetro que deve ser corrigido devido aos efeitos da temperatura, da radiação solar, do tempo de exposição e da umidade relativa. Além do mais, é realizada análise paramétrica visando o estudo dos fatores intervenientes e seus impactos na penetração de cloretos por difusão, de modo a contribuir para uma maior compreensão do fenômeno. Ademais, o modelo desenvolvido é aplicado às cidades de Vitória (ES) e Florianópolis (SC) analisando-se a vida útil para diferentes cobrimentos de concreto, fazendo um paralelo com a norma brasileira.Palavras-chave: cloretos, corrosão, difusão, método dos elementos finitos, vida útil.

show abstract

Diffusion of chloride ions in hardened cement pastes

Cited by 484 publications

References 6 publications

Bond Deterioration of Reinforcing Steel in Concrete Due to Corrosion

Bond Deterioration of Reinforcing Steel in Concrete Due to Corrosion

Towards multiscale modeling of the interaction between transport and fracture in concrete

Computational modeling for predicting corrosion initiation in reinforced concrete structures

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