Long-term effect of water chemistry on the swelling pressure of a bentonite-based material - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Applied Clay Science Année : 2014

Long-term effect of water chemistry on the swelling pressure of a bentonite-based material

(1) , (1) , (1) , (1) , (2) , (3)
Qiong Wang
  • Fonction : Auteur
  • PersonId : 899803
Yu-Jun Cui
  • Fonction : Auteur correspondant
  • PersonId : 2792
  • IdHAL : yu-jun-cui

Connectez-vous pour contacter l'auteur
Anh Minh A.M. Tang
Pierre Delage
Wei-Min Ye
  • Fonction : Auteur
  • PersonId : 863451


Compacted bentonite-based materials have been proposed as possible sealing and backfill materials in geological repositories for the high-level radioactive waste disposal in several countries. During the long time lifespan of a repository, as the chemical composition of pore water can change, the swelling and sealing capacity of the material may also change. From a point of view of storage safety assessment, it is important to evaluate this possible change of swelling capacity. In this study, a mixture of bentonite and crushed Callovo-Oxfordian claystone was investigated. The long-term effect of pore water chemistry on the swelling pressure was studied at constant-volume conditions for 700 days. Distilled water and synthetic water having the chemical composition similar to that of in-situ pore water were used for hydration. The results obtained in an initial period of 100 h revealed no significant influence of the water composition on the swelling pressure evolution, and the maximum swelling pressures observed were close to 4.30 MPa for a dry density of 1.70 Mg/m3. Over a longer time period, on the contrary, the swelling pressure eventually decreased for all samples, especially for the sample saturated with synthetic water. In addition, comparison of a one-step soaking test with a multi-step soaking test showed no wetting procedure effect on the long term swelling behaviour. All the results are analysed by considering the physico-chemical interaction between the minerals of claystone, minerals of bentonite and different fluids involved.
Fichier principal
Vignette du fichier
Long-term effect of water chemistry on the swelling pressure.. Revision (1).pdf (234.19 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-00926946 , version 1 (23-02-2015)



Qiong Wang, Yu-Jun Cui, Anh Minh A.M. Tang, Pierre Delage, Behrouz Gatmiri, et al.. Long-term effect of water chemistry on the swelling pressure of a bentonite-based material. Applied Clay Science, 2014, 87, pp.157-162. ⟨10.1016/j.clay.2013.10.025⟩. ⟨hal-00926946⟩
317 Consultations
453 Téléchargements



Gmail Facebook Twitter LinkedIn More