期刊
CEMENT AND CONCRETE RESEARCH
卷 42, 期 1, 页码 8-19出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2011.07.002
关键词
Modelling; Carbonation; Durability; Transport properties; Oil well cement
资金
- BRGM
- French Research National Agency (ANR) [ANR-08-PCO2-006]
A poromechanical model is developed to identify how chemical reactions of carbonation may impact the mechanical behaviour of wellbore cement in the context of CO2 storage. The model enables the evaluation of pore overpressure, porosity and solid-skeleton strain evolutions during the carbonation process. The major chemical reactions occurring within cement and their consequences on the volumes of dissolved cement matrix and precipitated carbonate are identified. This information is imported into a poromechanical model and the risk of damage is estimated through the calculation of the free energy stored within the solid matrix. A semi-analytical solution is proposed and applied to a simplified 10 cement carbonation example. The risk of damage of the cement structure submitted to intrusion of aqueous CO2 is estimated. A set of parametric studies is carried out to investigate the effect of medium permeability and effective diffusion coefficient on the damage risk. (C) 2011 Elsevier Ltd. All rights reserved.
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