Modelling the carbonation of cement pastes under a CO2 pressure gradient considering both diffusive and convective transport

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Modelling the carbonation of cement pastes under a CO2 pressure gradient considering both diffusive and convective transport. / Phung, Quoc Tri; Maes, Norbert; Jacques, Diederik; Perko, Janez.

In: Construction and Building Materials, Vol. 114, 01.07.2016, p. 333-351.

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@article{3b4912e8508d4310822a1848ebab5bcb,
title = "Modelling the carbonation of cement pastes under a CO2 pressure gradient considering both diffusive and convective transport",
abstract = "Underground concrete structures in radioactive waste disposal have the potential to be subjected to a high hydrostatic pressure and the surrounding environment may contain a high dissolved CO2 concentration. Therefore, a combination of diffusion and advection should be taken into account when one considers the carbonation mechanism. This study aims at developing a model to predict the evolution of the microstructure and transport properties of hardened cement pastes due to carbonation under accelerated conditions in which a pressure gradient of pure CO2 is applied. The current model is improved from the preliminary model in terms of extension to limestone cement paste and accounting for the transport of moisture. The proposed model is based on a macroscopic mass balance for CO2 and moisture in both gaseous and aqueous phases. A simplified solid-liquid equilibrium curve is used to relate the Ca content in aqueous and solid phases. Besides the prediction of the changes in porosity, diffusivity, permeability, and saturation degree, the model also enables prediction of the carbonation degree, portlandite content, and CO2 uptake. Verification with experimental results from accelerated carbonation tests shows a good agreement.",
keywords = "modelling, carbonation, transport properties, microstructure, cement paste, limestone filler",
author = "Phung, {Quoc Tri} and Norbert Maes and Diederik Jacques and Janez Perko",
note = "Score=10",
year = "2016",
month = jul,
day = "1",
doi = "10.1016/j.conbuildmat.2016.03.191",
language = "English",
volume = "114",
pages = "333--351",
journal = "Construction and Building Materials",
issn = "0950-0618",
publisher = "Elsevier",

}

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TY - JOUR

T1 - Modelling the carbonation of cement pastes under a CO2 pressure gradient considering both diffusive and convective transport

AU - Phung, Quoc Tri

AU - Maes, Norbert

AU - Jacques, Diederik

AU - Perko, Janez

N1 - Score=10

PY - 2016/7/1

Y1 - 2016/7/1

N2 - Underground concrete structures in radioactive waste disposal have the potential to be subjected to a high hydrostatic pressure and the surrounding environment may contain a high dissolved CO2 concentration. Therefore, a combination of diffusion and advection should be taken into account when one considers the carbonation mechanism. This study aims at developing a model to predict the evolution of the microstructure and transport properties of hardened cement pastes due to carbonation under accelerated conditions in which a pressure gradient of pure CO2 is applied. The current model is improved from the preliminary model in terms of extension to limestone cement paste and accounting for the transport of moisture. The proposed model is based on a macroscopic mass balance for CO2 and moisture in both gaseous and aqueous phases. A simplified solid-liquid equilibrium curve is used to relate the Ca content in aqueous and solid phases. Besides the prediction of the changes in porosity, diffusivity, permeability, and saturation degree, the model also enables prediction of the carbonation degree, portlandite content, and CO2 uptake. Verification with experimental results from accelerated carbonation tests shows a good agreement.

AB - Underground concrete structures in radioactive waste disposal have the potential to be subjected to a high hydrostatic pressure and the surrounding environment may contain a high dissolved CO2 concentration. Therefore, a combination of diffusion and advection should be taken into account when one considers the carbonation mechanism. This study aims at developing a model to predict the evolution of the microstructure and transport properties of hardened cement pastes due to carbonation under accelerated conditions in which a pressure gradient of pure CO2 is applied. The current model is improved from the preliminary model in terms of extension to limestone cement paste and accounting for the transport of moisture. The proposed model is based on a macroscopic mass balance for CO2 and moisture in both gaseous and aqueous phases. A simplified solid-liquid equilibrium curve is used to relate the Ca content in aqueous and solid phases. Besides the prediction of the changes in porosity, diffusivity, permeability, and saturation degree, the model also enables prediction of the carbonation degree, portlandite content, and CO2 uptake. Verification with experimental results from accelerated carbonation tests shows a good agreement.

KW - modelling

KW - carbonation

KW - transport properties

KW - microstructure

KW - cement paste

KW - limestone filler

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/11956229

U2 - 10.1016/j.conbuildmat.2016.03.191

DO - 10.1016/j.conbuildmat.2016.03.191

M3 - Article

VL - 114

SP - 333

EP - 351

JO - Construction and Building Materials

JF - Construction and Building Materials

SN - 0950-0618

ER -

ID: 855035