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Thermochemical effects on the smectite alteration of GMZ bentonite for deep geological repository

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Abstract

Gaomiaozi (GMZ) bentonite has been recognized as the first choice for using as buffer/backfill material in deep geological repository for the disposal of high-level nuclear waste in China. High salinity and high pH of the pore solutions may cause changes in the mineralogical composition, and the swelling capacity of the bentonite results in affecting the long-term performance of the engineering barrier system. In the present work, a series of hydrothermal reactivity experiments were performed using batch reactors at 20, 35 and 80 °C for evaluating the chemical and mineralogical responses of GMZ bentonites. The results show that the dissolution of smectite releases Si and Al under the conditions of 1 M KOH at 35 and 80 °C and the released Si and Al may work as a cementing agent in GMZ bentonite. XRD pattern results show that alteration of the GMZ bentonite is expected to be insignificant for reaction with NaCl, KCl and NaOH solutions under low temperatures. However, it is obviously reacted with KOH solutions especially at 80 °C, during which cementitious material was produced leading to kaolinitization. When contacted with KOH solutions, the basal spacing (d001) of the main primary diffraction peaks (001) value of GMZ bentonite increases with increasing temperature. Salinity also can influence the smectite stability and accordingly loss of swelling capacity. This conclusion could be explained by the diffusing double-layer effects induced by salt solutions and ion exchange.

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Acknowledgments

The authors are grateful to China Atomic Energy Authority [Project (2011)1051], the National Natural Science Foundation of China (Projects No. 41272287, 41030748), for the financial supports.

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Authors and Affiliations

  1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai, 200092, China

    W. M. Ye, Y. He, Y. G. Chen, B. Chen & Y. J. Cui

  2. United Research Center for Urban Environment and Sustainable Development, The Ministry of Education, Shanghai, 200092, China

    W. M. Ye

  3. Laboratoire Navier, Ecole des Ponts Paris Tech, Paris, France

    Y. J. Cui

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Ye, W.M., He, Y., Chen, Y.G. et al. Thermochemical effects on the smectite alteration of GMZ bentonite for deep geological repository. Environ Earth Sci 75, 906 (2016). https://doi.org/10.1007/s12665-016-5716-0

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