Permeability and porosity changes associated with cement grout carbonation

Dewaele, Paul; Reardon, Eric J.; Dayal, R.

doi:10.1016/0008-8846(91)90092-v

“…Martin [17] used CO 2 in gas permeability tests and observed a reduction in permeability as a consequence of carbonation during the test. Using CEM I grouts, Dewaele et al [9] obtained permeability decrease of several orders of magnitude after carbonation (by injection under pressure of CO 2 -rich water). Claisse et al [6] carbonated CEM I concretes (5% CO 2 ) and measured significant increase in the so-called impermeability index [18] indicating a fall in permeability.…”

Section: Introductionmentioning

confidence: 98%

“…Beyond the fall of the pore solution pH that triggers rebar depassivation and corrosion, the precipitation of CaCO 3 generates porosity clogging: the reduction of which depends on the cement type and water to cement ratio (w/c) [2][3][4][5][6][7][8]. The specific surface area is then significantly decreased (around 50%) despite conflicting observations [9,10].…”

Section: Introductionmentioning

confidence: 98%

Impact of carbonation on unsaturated water transport properties of cement-based materials

Auroy

¹

,

Poyet

²

,

Bescop

³

et al. 2015

Cement and Concrete Research

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International audienceIn unsaturated conditions, the durability of concrete structures is strongly dependent on the evolution of the amount of free water within concrete porosity. Reliable durability assessment of concrete structures in relation to their environment thus requires accurate unsaturated water transport description as well as reliable input data. The effect of carbonation on water transport remains poorly studied and data are lacking. It was then the purpose of this article to acquire all the data needed to describe unsaturated water transport in carbonated cementitious materials (porosity, water retention and unsaturated permeability). Four hardened pastes made with four different binders were carbonated at 3% CO2 to ensure representativeness with natural carbonation. Beyond the modification of the water retention curve and porosity clogging, significant microcracking due to carbonation shrinkage was observed. The consequence on permeability highlighted a competition between porosity clogging and microcracking that was dependent on the initial mineralogical composition

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“…Portland cement will react with CO 2 when water is present and form carbonation [6]. Carbonation is associated with the changes in the flow and transport properties and will cause to a loss of hydraulic and diffusion properties [6][7][8][9][10][11].The change of porosity in porous medium are typically caused by the mineral alteration processes. During chemical or physical process, clogging of porous media due to mineral precipitation can lead to a reduction of the effective porosity and hydraulic conductivity.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Effectiveness of CO2 Sequestration Using Portland Cement in Geological Reservoir Based on Unified Pipe-network Method

Yan

¹

,

Sun

²

,

Li

³

et al. 2020

Energies

6

0

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In this paper, we first recapitulate some basic notions of the CO 2 sequestration and numerical model. Next, a mixed model is employed into the CO 2 sequestration framework, for simulating CO 2 geological sequestration processes. The last part of the paper makes extensions to evaluation of the effectiveness of CO 2 sequestration with respect to atmospheric pressure, formation temperature, the initial reactant concentration, fracture aperture, and fracture dip. The results show that reactive Portland cement has a great impact on the effectiveness of CO 2 sequestration, while the proposed mixed model is robust in simulation.

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“…Portland cement will react with CO 2 when water is present and form carbonation [6]. Carbonation is associated with the changes in the flow and transport properties and will cause to a loss of hydraulic and diffusion properties [6][7][8][9][10][11].The change of porosity in porous medium are typically caused by the mineral alteration processes. During chemical or physical process, clogging of porous media due to mineral precipitation can lead to a reduction of the effective porosity and hydraulic conductivity.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of effectiveness of CO<sub>2</sub> sequestration in geological reservoir based on Unified Pipe-network Method

Yan¹,

Sun²,

S³

et al. 2019

Preprint

0

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The underground injection and geological sequestration of carbon dioxide (CO2) is a promising approach for reducing the levels of CO2 in the atmosphere. To mitigate the leakage of CO2 resulting from natural fracture networks in rock masses, the sequestration process is commonly accompanied by the injection of reactive Portland cement representing a coupled hydro-chemo-mechanical process. In this work, a numerical approach based on the unified pipe network method (UPM) is presented that considers the coupled permeation and diffusion processes with chemical precipitation. Most input parameters are derived from the published literature. The proposed approach is validated through a comparison with analytical solutions, which are applied to simulate the CO2 sequestration process in a fractured rock mass. The results indicate that the long-term sequestration effect, which is highly influenced by the fracture distribution, can be captured effectively by the model. Consequently, the presented approach can assist engineers in properly designing the arrangement of boreholes and determining the concentration of the grouting material.

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Permeability and porosity changes associated with cement grout carbonation

Cited by 50 publications

References 11 publications

Impact of carbonation on unsaturated water transport properties of cement-based materials

Impact of carbonation on unsaturated water transport properties of cement-based materials

Evaluation of Effectiveness of CO2 Sequestration Using Portland Cement in Geological Reservoir Based on Unified Pipe-network Method

Evaluation of effectiveness of CO<sub>2</sub> sequestration in geological reservoir based on Unified Pipe-network Method

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