Simulation of Humidity Fields in Concrete: Experimental Validation and Parameter Estimation

Oliveira, Marcos Antônio de; Azenha, Miguel

doi:10.3151/jact.13.214

Cited by 16 publications

(8 citation statements)

References 59 publications

(110 reference statements)

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“…The decoupled humidity field for 1D using FDM is previously presented in Oliveira et al [45]. For carbon dioxide field, the mathematical implementation is similar, thus for the sack of brevity, the implementation of both fields are herein omitted, further details may be seen in literature [45].…”

Section: Implementation Of Multi-physics Modelling: a Brief Discussionmentioning

confidence: 99%

“…For brevity and due to the similarity with the 1D implementation, the 2D and axisymmetric implementations are not presented herein, more details can be seen in Oliveira [10]. The chosen notation for reaction field R is the same adopted in Oliveira et al [45], where "i" represents the node, and "n" reads as the time step [10].…”

Section: Implementation Of Multi-physics Modelling: a Brief Discussionmentioning

confidence: 99%

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A multi-physics modelling based on coupled diffusion equations to simulate the carbonation process

Oliveira

Azenha

2020

Rev. IBRACON Estrut. Mater.

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Carbonation is widely recognized as a cause of significant pathologies in reinforced concrete structures and different modelling strategies are presented in literature the simulate the phenomenon evolution. In opposition to the deleterious effect in reinforced concrete, for historical mortar made with aerial lime, the carbonation is essential for the hardening process. For both materials, carbonation process presents similarities. This work presents the background/implementation of an algorithm for a multi-physics simulation of the main fields associated with the carbonation process. This modelling was previously validated in literature. A 1D algorithm is implemented, using the Finite Difference Method. Its feasibility is demonstrated through the simulation of results presented in the literature. A parametric study is also shown considering the main parameters involved, important observation regarding the influence of the parameters on the carbonation depth are detailed.

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Section: Implementation Of Multi-physics Modelling: a Brief Discussionmentioning

confidence: 99%

Section: Implementation Of Multi-physics Modelling: a Brief Discussionmentioning

confidence: 99%

A multi-physics modelling based on coupled diffusion equations to simulate the carbonation process

Oliveira

Azenha

2020

Rev. IBRACON Estrut. Mater.

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“…To explore the influence of different curing effects on the humidity field, three calculation conditions (60, 80, and 100%) are defined based on the varying environmental humidity. According to the research results obtained by Oliveira et al [25], the surface factor f boundary is approximately linear with D 1 , as shown in equation (29):…”

Section: Calculation Modelmentioning

confidence: 94%

“…e humidity transfer rate at the concrete surface is related to ambient humidity, wind speed, and temperature. It can be calculated using equation ( 18) [25]:…”

Section: Initial and Boundary Conditionsmentioning

confidence: 99%

Thermo‐Hydro‐Mechanical Combined Effect Analysis Model for Early‐Age Concrete Bridges and Its Application

Yang

et al. 2020

Advances in Civil Engineering

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The early cracking of concrete beam bridges remains a concern in civil engineering. An analytical model considering the combined effect of thermo-hydro-mechanical processes forms the basis for assessing the cracking risk of girders during construction. Based on the equivalent hydration theory, the temperature and moisture conduction processes and the evolution of the mechanical properties of concrete were modeled as a function of the equivalent age. A coupling model for the temperature and moisture fields was established, and a theoretical framework for analyzing the thermo-hydro-mechanical combined effect was presented. Based on this, a numerical analysis method was proposed and implemented into ABAQUS; the results were validated with some typical tests. Finally, a long-span prestressed concrete (PC) box girder bridge with balanced cantilever construction was taken as an example, and the causes of web cracking and its impact degree were analyzed. The results show that the rate of moisture conduction is significantly lower than the rate of temperature conduction; even for thin-walled components, there exists a significant humidity gradient on the surface layer. The humidity-induced shrinkage and restraint of the precast members are the main causes of web cracking.

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“…Para uma análise detalhada do campo de umidade, torna-se essencial o conhecimento do perfil de umidade ao longo do tempo [22], bem como a redução pela auto-dissecação do material, que corresponde ao fenômeno associado a redução da umidade pelo consumo próprio do material [2,7,22]. A estratégia adotada neste trabalho pretende investigar a difusão de umidade na argamassa de cal aérea nas idades inicias, ou seja.…”

Section: Introductionunclassified

Estudo experimental do fluxo de umidade em argamassas de cal aérea

et al. 2019

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RESUMO Uma parte significativa do património histórico construído ao redor do mundo é constituída de alvenaria estrutural, com juntas preenchidas com argamassa. Nesses sistemas estruturais, a argamassa usualmente representa uma parcela pequena/moderada do volume total da estrutura, no entanto, a argamassa é reconhecida como a principal fonte de movimentos/deformações, dessa forma, justifica-se a necessidade de um melhor conhecimento do comportamento. Na fabricação de argamassas antigas, a cal aérea é um dos ligantes mais recorrentes. Nessas argamassas, o endurecimento do material é gradual a partir da superfície, em correspondência com os processos de carbonatação e secagem. Os dois processos citados condicionam diversas propriedades do material. Para argamassas de cal aérea, o estudo da carbonatação é difundido na literatura, porém para o fluxo de umidade, o número de estudo ainda é reduzido. Durante a fabricação da argamassa parte da água utilizada é evaporada pela reação de hidratação. Todavia, permanece no material um alto teor de umidade. No presente trabalho, são descritos estudos realizados para compreensão dos fluxos internos de umidade nessas argamassas. A campanha experimental, inicia-se com a caracterização dos materiais, bem como a definição da composição/traço da argamassa. Os corpos-de-prova foram armazenados em ambiente controlado, dentro de uma câmera climática, sendo que os mesmos possuem geometrias que simulam condições de fluxos uniaxial (1D) e axissimétricos. Foi efetuada a monitorização da umidade interna dos corpos-de-prova em várias profundidades ao longo do tempo. Os resultados indicam um processo de difusão acelerado, com decréscimo rápido da umidade quando comparados com valores usuais observados em concretos ou argamassas à base de cimento.

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Simulation of Humidity Fields in Concrete: Experimental Validation and Parameter Estimation

Cited by 16 publications

References 59 publications

A multi-physics modelling based on coupled diffusion equations to simulate the carbonation process

A multi-physics modelling based on coupled diffusion equations to simulate the carbonation process

Thermo‐Hydro‐Mechanical Combined Effect Analysis Model for Early‐Age Concrete Bridges and Its Application

Estudo experimental do fluxo de umidade em argamassas de cal aérea

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