Numerical modeling of supercritical carbonation process in cement-based materials

Zha, Xiaoxiong; Yu, Mao-Hong; Ye, Jianqiao; Feng, Gan-Lin

doi:10.1016/j.cemconres.2015.02.017

Cited by 67 publications

(54 citation statements)

References 28 publications

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“…The mathematical model of supercritical carbonation is briefly described below and the details of the model can be found from Zha and Yu [15] .…”

Section: Theoretical Model For Supercritical Carbonation Of Cement-bamentioning

confidence: 99%

“…Introducing the improved random field into the supercritical carbonation model developed previously by the authors [15] , new studies are carried out on the supercritical carbonation of cement based materials. Comparisons are made against the experimental tests reported also by the authors [15] to investigate the effect of random distribution of porosity in cement mortar on the carbonation depth, such that the irregular carbonation depths, particularly, the maximum and minimum depths can be statistically explained and predicted.…”

Section: Introductionmentioning

confidence: 99%

“…Rimmelé et al [22] studied random porosity of Portland cement by exposing it to liquid CO 2 . Zha and Yu [15] investigated experimentally the carbonation depth of cement mortar subjected to supercritical conditions, which has shown a carbonation zone of irregular boundaries. Moreover, Lu, et al's [24] experiment confirmed that saturation was also randomly distributed.…”

Section: Introductionmentioning

confidence: 99%

“…Carbonation of cement based materials is a complex multi-physics process [12,[14][15][16][17] , involving chemical reactions of CO 2 with CH and C-S-H; gas-liquid two phase flow; dispersion and diffusion of CO 2 in water; and temperature propagation. It is also a chemical-physical process of, e.g., calcium leaching and calcite precipitation.…”

Section: Introductionmentioning

confidence: 99%

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The effect of random porosity field on supercritical carbonation of cement-based materials

et al. 2017

Construction and Building Materials

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Abstract:In this paper, the supercritical carbonation process of cement-based materials is modelled by introducing a random porosity field to simulate the heterogeneous geometry of the carbonation profile. The suitability of two different random fields of porosity, based on the Probability Density Function (PDF) and the Ellipsoidal Autocorrelation Function (EAF) methods, are investigated, respectively, in simulating the distribution of porosity in cement mortar. After incorporating the above random fields into an established supercritical carbonation model, it is found that with some modifications, the EAF method with consideration of spatial correlation produces better simulation of the irregularities of the carbonation zones that have been observed from experimental results. It is also found that for given average porosity and coefficient of variation, the predicted average and maximum carbonation depths have much smaller coefficients of variation. The validated EAF supercritical carbonation model is then used in parametric studies that are conducted to assess the effect of various factors on the carbonation depth of the chemical process.

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“…The mathematical model of supercritical carbonation is briefly described below and the details of the model can be found from Zha and Yu [15] .…”

Section: Theoretical Model For Supercritical Carbonation Of Cement-bamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The effect of random porosity field on supercritical carbonation of cement-based materials

et al. 2017

Construction and Building Materials

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“…As a result, its applicability and versatility were limited. Zha et al [28] proposed a mathematical model to simulate the physicalchemical coupling process of supercritical carbonation in cement-based materials. is model took into account the rate of chemical reaction, mass conservation for gas-liquid two-phase ow, di usion and dispersion of CO 2 in water, energy conservation for porous medium, and the solubility of CO 2 in water, while this model did not consider the in uence of the time and temperature variation.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation on Carbonation Depth of Concrete Structures considering Time‐ and Temperature‐Dependent Carbonation Process

Peng

Tang

Zhang

et al. 2018

Advances in Materials Science and Engineering

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In order to further understand the carbonation process of concrete structures, the time-and temperature-dependent diffusion process of CO 2 in concrete is simulated based on the law of the CO 2 mass conservation, and a two-dimensional mass transfer equation is established for the CO 2 diffusion in concrete. e concrete block is discretized into triangular elements, and the CO 2 concentrations at different positions are calculated based on finite element method. A computational algorithm is programed through the Matlab platform. e time-and temperature-dependent property and difference of the CO 2 concentration at different positions of the structure are considered in the proposed model. en, an accelerated carbonation experiment is carried out using concrete blocks with different mix proportions to investigate the influence of the water-cement ratio and temperature on the concrete carbonation. e experimental results effectively verify the correctness of the finite element model, and the proposed finite element method reasonably simulates the concrete carbonation through calculating the carbonation in practical engineering compared with other methods in references. An experimental-numerical correlation has been performed. e ratio of carbonation depth at the corner of the concrete members to the other positions is about 1.35. e carbonation depth is increased about 1.9 times when the temperature changes from 20°C to 40°C.

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A multiphysical‐geochemical coupling model for caprock sealing efficiency in CO₂ geosequestration

Wang

et al. 2023

Deep Underground Science and Engineering

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Precipitation or dissolution due to geochemical reactions has been observed in the caprocks for CO 2 geosequestration. Geochemical reactions modify the caprock sealing efficiency with self-limiting or self-enhancement. However, the effect of this modification on the caprock sealing efficiency has not been fully investigated through multiphysical-geochemical coupling analysis. In this study, a multiphysical-geochemical coupling model was proposed to analyze caprock sealing efficiency. This coupling model considered the full couplings of caprock deformation, two-phase flow, CO 2 concentration diffusion, geochemical reaction, and CO 2 sorption. The two-phase flow only occurs in the fracture network and the CO 2 may partially dissolve into water and diffuse through the concentration difference. The dissolved CO 2 has geochemical reactions with some critical

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Numerical modeling of supercritical carbonation process in cement-based materials

Cited by 67 publications

References 28 publications

The effect of random porosity field on supercritical carbonation of cement-based materials

The effect of random porosity field on supercritical carbonation of cement-based materials

Numerical Simulation on Carbonation Depth of Concrete Structures considering Time‐ and Temperature‐Dependent Carbonation Process

A multiphysical‐geochemical coupling model for caprock sealing efficiency in CO₂ geosequestration

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Numerical modeling of supercritical carbonation process in cement-based materials

Cited by 67 publications

References 28 publications

The effect of random porosity field on supercritical carbonation of cement-based materials

The effect of random porosity field on supercritical carbonation of cement-based materials

Numerical Simulation on Carbonation Depth of Concrete Structures considering Time‐ and Temperature‐Dependent Carbonation Process

A multiphysical‐geochemical coupling model for caprock sealing efficiency in CO2 geosequestration

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Product

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A multiphysical‐geochemical coupling model for caprock sealing efficiency in CO₂ geosequestration