Factors Affecting Concrete Carbonation Ratio

Uomoto, Taketo; Takada, Yogo

doi:10.2208/jscej.1992.451_119

Cited by 36 publications

(20 citation statements)

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“…Also, the solubility of calcium hydroxide and carbon dioxide reduce significantly as the temperature increases, which is known to have the effect of reducing rate of the carbonation reaction. According to the research of Uomoto and Takada (1993), the rate of carbonation reaction is the highest in the range 30°C to 40°C, and tends to reduce in temperature environments higher than this. The carbonation rate is a function of many factors, such as the diffusivity and equilibrium of carbon dioxide, solubility of calcium hydroxide, and the moisture state in pore structure, so at a glance it appears very complex phenomenon.…”

Section: Modeling Of Carbonation Reaction At Arbitrary Temperature Comentioning

confidence: 99%

Modeling of Carbonation based on Thermo-Hygro Physics with Strong Coupling of Mass Transport and Equilibrium in Micro-pore Structure of Concrete

Ishida

2008

ACT

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A carbonation model based on thermo-hygro physics is presented in this paper. Reaction of C-S-H gel was newly added to the existing model as well as calcium hydroxide reaction, and a micro-pore structure model for carbonated concrete was improved by considering volume change and surface-area increase of hydrated products. The proposed model coupled with moisture equilibrium/transport gives reasonable predictions for carbonation progresses under low and high CO 2 concentrations in a unified manner. In addition, temperature dependent parameters were installed in the system. Although detailed mechanisms should be further investigated, the proposed methodology is able to simulate carbonation phenomena under various temperature conditions.

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Section: Modeling Of Carbonation Reaction At Arbitrary Temperature Comentioning

confidence: 99%

Modeling of Carbonation based on Thermo-Hygro Physics with Strong Coupling of Mass Transport and Equilibrium in Micro-pore Structure of Concrete

Ishida

2008

ACT

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“…Uomoto et al [30] presented a complex model of carbonation as a function of w/c, CO 2 concentration, temperature and exposure time:…”

Section: Overview Of Theoretical and Empirical Models Describing Carbmentioning

confidence: 99%

“…The results of each series of concrete in each test block were analyzed to verify the truth of the hypothesis about their convergence with a model in the general form (30). For this purpose for the Eq.…”

Section: Modelling Of Concrete Carbonation; Is It a Process Unlimitedmentioning

confidence: 99%

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Modelling of concrete carbonation; is it a process unlimited in time and restricted in space?

Czarnecki¹,

Woyciechowski²

2015

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. The aim of the article is mathematical modelling of the carbonation process that has been based on results of research conducted both in accelerated and natural conditions. The article covers short characteristic of carbonation, its processes and effects. Also critical review of articles that concern carbonation mathematical models was included in the paper. Assuming the self-terminating nature of carbonation the hyperbolic model of carbonation was formulated. Such a model describes the carbonation progress as the process unlimited in time but with the restricted range in concrete depth that is limited by the value of a model asymptote. Presented results cover research on carbonation of concrete with a different water-cement ratio and different types of binders and duration times of early curing. Investigations have been conducted as accelerated (1% concentration of CO2) as well as in long-term exposures in natural conditions. The obtained results confirmed statistically that hyperbolic model is a well-founded approach when the modelling concrete carbonation process is concerned.

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“…Empirical evidences of the behavior of the carbonation front propagation have shown a dependence on time following the so-called √t-law, [3,4,8,10,14,15,16,20]. In the framework of moving-boundary problems, to our knowledge, Tuutti [19] in 1982, was the first appealing to the square root of t-law in the problem of concrete carbonation.…”

Section: Introductionmentioning

confidence: 99%

Solving Moving Boundary Concrete Carbonation Models

Piqueras¹,

Company²,

Jódar³

2017

dtcse

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Abstract. In this work we present a finite difference method to solve a coupled mixed partial differential equation system arising in concrete carbonation problems. The free boundary problem under study is firstly transformed in a fixed boundary one, allowing the computation of the propagation front as a new unknown that can be computed together with the mass concentrations of CO2 in air and water. Apart from the stability and the consistency of the numerical solution, constructed by a finite difference scheme, qualitative properties of the numerical solution are established without proof. In fact, positivity of the concentrations, increasing properties of the propagation front and monotone behaviour of the solution are proved. We also confirm numerically the √t-law of propagation.

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Factors Affecting Concrete Carbonation Ratio

Cited by 36 publications

References 1 publication

Modeling of Carbonation based on Thermo-Hygro Physics with Strong Coupling of Mass Transport and Equilibrium in Micro-pore Structure of Concrete

Modeling of Carbonation based on Thermo-Hygro Physics with Strong Coupling of Mass Transport and Equilibrium in Micro-pore Structure of Concrete

Modelling of concrete carbonation; is it a process unlimited in time and restricted in space?

Solving Moving Boundary Concrete Carbonation Models

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