Compressibility of Four Types of Granular Bentonite Materials
Granular bentonite materials are some types of buffer/backfill materials with good performance, which are constituted by bentonite pellets or by pellets and bentonite powder. The dry density is the key parameter which controls the engineering properties of buffer/backfill materials. The grain size distribution will influence compressibility and dry density of the compressed granular bentonite materials. In the present work, four types of granular bentonite materials and bentonite powder had been selected and the compressibility and the degree of compaction of these packing materials had been studied. The results showed that the granular bentonite material contains 30% (in weight) powder and 70% (in weight) pellets sized between 2 and 5 mm had the best cost performance, such as, higher dry density, higher compacted dry density, easy to produce.
KeywordsHLW disposal Granular bentonite materials Compressibility Compacted dry density
The authors want to acknowledge the financial support provided by Project 41672261 supported by National Natural Science Foundation of China and the financial support provided by Project 2007-834 supported by the State Administration of Science, Technology and Industry for National Defence, PRC.
- 5.Tang C, Cui Y, Tang A (2009) Compression behaviors of crushed COx argillite used as backfilling material in HLW repository. Chin J Rock Mech Eng 23(12):2459–2465 (in Chinese)Google Scholar
- 7.NHRI (1999) Specification of soil test. The ministry of water resources of the People’s Republic of China, Beijing (in Chinese)Google Scholar
- 8.Mayor J, Garcia-Sineriz J, Alonso E (2005) Engineered barrier emplacement experiment in Opalinus Clay for the disposal of radioactive waste in underground repositories. Enresa Publications, TecnicasGoogle Scholar
- 9.Zhang H, Wang X, Liu P (2016) Sealing and healing of compacted bentonite block joints in HLW disposal. Chin J Rock Mech Eng 35(Suppl 2):3605–3614 (in Chinese)Google Scholar
- 10.Zhang M, Zhang H, Jia L (2012) Method for sample preparation of buffer/backfilling materials in laboratory. J Build Mater 15(5):638–643 (in Chinese)Google Scholar