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Effect of carbonation on the hydro-mechanical properties of portland cement
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|Authors:||Fabbri, A.; Corvisier, J.; Schubnel, A.; Brunet, F.; Fortin, J.; Goffé, B.; Barlet-Gouédard, V.; Rimmelé, G.; Leroy, Y.|
|Author Affiliations:||Primary: |
UMR 8538 ENS-CNRS, Laboratoire de Gélogie, Paris, France
|Volume Title:||Thermo-hydromechanical and chemical coupling in geomaterials and applications|
|Volume Authors:||Shao, Jian Fu, editor; Burlion, Nicolas|
|Source:||Thermo-hydromechanical and chemical coupling in geomaterials and applications, edited by Jian Fu Shao and Nicolas Burlion, p.613-620. Publisher: John Wiley & Sons, Inc., Hoboken, NJ, United States. ISBN: 978-1-118-62356-5|
|Note:||In English. 7 refs.; illus., incl. 1 table|
|Summary:||The performance of CO2 geological storage is highly dependent on the long-term well-bore integrity. The resistance of Portland cement to CO2-rich environments has been identified in laboratory as a potential critical issue with respect to well-bore integrity since this type of cement is used in borehole as sealing material. In the context of deep geological storage, the temperature and pressure conditions (90°C and 28 MPa) could dramatically enhance the chemical corrosion of the cement. Here, we try to evaluate experimentally the effect of this kind of carbonation on the hydro-mechanical cement properties. Using a tri-axial press, the static elastic constants (Young modulus and Poisson's ratio) were measured on a set of Portland cements carbonated beforehand under realistic downhole pressure and temperature conditions. Two types of carbonation features were achieved, either the samples were homogeneously carbonated or they displayed sharp carbonation fronts (heterogeneous carbonation). The effect of carbonation on water and gas permeabilities was also measured. Finally, P and S elastic wave velocities (ultrasonic range, 1MHz) were measured to evaluate dynamic elastic moduli and to characterize the density and distribution of cracks within the samples. Experimental results indicate that micro-cracks are likely to concentrate at the carbonation front. These micro-cracks may originate from sample decompression after the carbonation stage at 28 MPa or they could result from supercritical carbonation due to pore pressure increase. Even if decompression effect cannot be ruled out, mechanical calculation of the pore pressure resulting from supercritical carbonation indicates that the second option is the most likely. Abstract Copyright ISTE Ltd 2008.|
|Subjects:||Body waves; Carbon dioxide; Cement materials; Construction materials; Cracks; Durability; Elastic constants; Elastic waves; Engineering properties; Hydraulics; Mechanical properties; Microcracks; P-waves; Permeability; Physicochemical properties; Pore pressure; S-waves; Sample preparation; Seismic waves; Triaxial tests|
|Copyright Information:||GeoRef, Copyright 2021 American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom|
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