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Investigating the Swelling Pressure of Compacted Crushed-Callovo-Oxfordian Claystone
Abstract : This paper presents an experimental study on the swelling pressure of heavily compacted crushed Callovo-Oxfordian (Cox) claystone at a dry unit mass d = 2.0 Mg/m3 using four different methods: constant-volume, swell-reload, zero-swell and adjusted constant-volume method. Results show that the swelling pressure varies in the range of 1-5 MPa and depends significantly on the test method. From the constant-volume tests, it is observed that the swelling behaviour during wetting is a function of the suction and depends on both the hydration paths and wetting conditions (e.g. vapour-wetting or liquid-wetting). The swelling pressure decreases significantly with saturation time. To identify the microstructure changes of specimens before and after wetting, mercury intrusion porosimetry (MIP) and scanning electron microscopy (SEM) tests were performed. It is observed that, after wetting, the large inter-aggregate pores observed in the as-compacted specimen are no longer apparent; the whole pattern is characterized by a general swell of hydrated clay particles, rendering the soil more homogeneous. Results from MIP indicated that wetting caused a significant reduction of the entrance diameter of the dominant inter-aggregate pores from 2.1 to 0.5 m whereas intra-aggregate pores were not significantly influenced.
Littérature citée [45 références]
https://hal-enpc.archives-ouvertes.fr/hal-00655750
Contributeur : Yu-Jun Cui Connectez-vous pour contacter le contributeur
Soumis le : lundi 2 janvier 2012 - 10:59:06
Dernière modification le : lundi 11 janvier 2021 - 10:22:04
Archivage à long terme le : : mardi 3 avril 2012 - 02:21:42
Contributeur : Yu-Jun Cui Connectez-vous pour contacter le contributeur
Soumis le : lundi 2 janvier 2012 - 10:59:06
Dernière modification le : lundi 11 janvier 2021 - 10:22:04
Archivage à long terme le : : mardi 3 avril 2012 - 02:21:42
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Tang_et_al-JPCE2011_HAL.pdf
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