Abstract
Bentonite is used as a buffer material in the deep geological repository for the safe disposal of high-level nuclear waste (HLW). The repository consists of a natural barrier system and an engineered barried system. Natural barrier system consists of a host rock and its surroundings and engineered barrier system consists of a buffer material as well as a waste canister. Bentonite is compacted around the waste canister to isolate it from the atmosphere as well as to provide long-term stability to the barrier. The high temperature (150–250 °C) of the waste canister reduces over thousands of years till the radioactivity of the waste degrades as well as while the long-term operation of the repository, the concrete components will deteriorate and produce alkaline fluids having pH > 12. This long-term influence of high temperature may create a thermal history on the compacted bentonite, and the highly alkaline solution may alter the bentonite near the concrete affecting the physical and chemical properties of compacted bentonite. Hence, it is necessary to investigate the influence of alkaline environment along with the induced thermal history on the swelling pressure of compacted bentonite. The paper discusses an assessment of swell pressures of compacted bentonite [Barmer 1 (B1)] from Barmer district of Rajasthan, India, with an initial dry density of 1.5 Mg/m3 and subjected to 110 °C, hydrated with cement solution and distilled water. The swelling load is recorded with the help of digital load frame and compared with non-heated samples of the same density. The swelling time data of compacted bentonite is presented and compared. Experimental evidence indicated that the swelling pressure of compacted bentonite was less when hydrated with cement water as compared to distilled water. But the time taken for saturation was more when hydrated with cement water as compared to distilled water. However, further investigation is required to understand the swelling mechanism under highly alkaline solutions.
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References
Gaucher, E., Blanc, P.: Cement/clay interactions–a review: experiments, natural analogues, and modeling. Waste Manage. 26(7), 776–788 (2006)
Karnland, O., Birgersson, M.: Montmorillonite stability with special respect to KBS-3 conditions. In: Technical Report TR-06–11 Clay Technology AB (2006)
Lee, J.O., Cho, W.J., Chun, K.S.: Swelling pressures of a potential buffer material for a high-level waste repository. J. Korean Nucl. Soc. 31(2), 139–150 (1999)
He, Y., Cui, Y.J., Ye, W.M., Conil, N.: Effects of wetting-drying cycles on the air permeability of compacted Téguline clay. Eng. Geol. 228, 173–179 (2017)
Cui, Y.: On the hydro-mechanical behavior of MX80 bentonite-based materials. J. Rock Mech. Geotech. Eng 9(3), 565–574 (2017)
Karnland, O., Olsson, S., Nilsson, U.: Mineralogy and sealing properties of various bentonites and smectite-rich clay materials. In: SKB TR-06–30. Swedish Nuclear Fuel and Waste Management Co, Stockholm, Sweden (2006).
Rao, S., Ravi, K.: Influence of initial degree of saturation on swell pressures of compacted Barmer bentonite specimens. Ann. Nuc. Energy 80, 303–311 (2015)
Saba, S., Barnichon, J., Cui, Y., Tang, A., Delage, P.: Microstructure and anisotropic swelling behavior of compacted bentonite/sand mixture. J. Rock Mech. Geotech. Eng. 6(2), 126–132 (2014)
Kale, R., Ravi, K.: Influence of thermal history on swell pressures of compacted bentonite. Process Saf. Environ. Prot. 123, 199–205 (2019)
Abuel-Naga, H., Bergado, D., Ramana, G., Grino, L., Rujivipat, P., Thet, Y.: Experimental evaluation of the engineering behavior of soft Bangkok clay under elevated temperature. J. Geotech. Geoenviron. 132(7), 902–910 (2006)
Pusch, R., Muurinen, A., Lehikoinen, J., Bors, J., Eriksen, T.: Microstructural and chemical parameters of bentonite as determinants of waste isolation efficiency. In: Project Report EUR 18950 EN. European Commission, Nuclear Science, and Technology (1999)
Cho, W., Lee, J., Kang, C.: Influence of temperature elevation on the sealing performance of the potential buffer material for a high-level radioactive waste repository. Ann. Nuc. Energy 27, 1271–1284 (2000)
Romero, E., Villar, M., Lloret, A.: Thermo-hydromechanical behavior of heavily overconsolidated clays. Eng. Geol. 81, 255–268 (2005)
Herbert, H., Kasbohm, J., Moog, H., Henning, K.: Long term behavior of the Wyoming bentonite MX-80 in high saline solutions. Appl. Clay Sci. 26, 275–291 (2003)
Jenni, A., Gimmi, T., Alt-Epping, P., Mäder, U., Cloet, V.: Interaction of ordinary Portland cement and Opalinus Clay: dual porosity modelling compared to experimental data. Phys. Chem. Earth Parts A/B/C 99, 22–37 (2017)
Estabragh, A., Khosravi, F., Javadi, A.: Effect of thermal history on the properties of bentonite. Environ. Earth Sci. 75–8, 657 (2016)
Chen, Y., Cui, Y., Tang, A., Wang, Q., Ye, W.: A preliminary study on hydraulic resistance of bentonite/host-rock seal interface. Géotechnique 64(12), 997–1002 (2014)
Torres, E., Turrero, M., Escribano, A., Martín, P.: Geochemical interactions at the concrete-bentonite interface of column experiments. PEBS, FP7–249681, 73 (2013)
Zhu, C., Ye, W., Chen, Y., Chen, B., Cui, Y.: Influence of salt solutions on the swelling pressure and hydraulic conductivity of compacted GMZ01 bentonite. Eng. Geol. 166, 74–80 (2013)
Kale, R., Ravi, K.: Influence of thermal loading on the index and physicochemical properties of Barmer bentonite. Appl. Clay Sci. 165, 22–39 (2018)
Pusch, R.: Swelling pressure of highly compacted bentonite. In: SKB Technical Reports TR-80–13 (1980a).
Komine, H.: Simplified evolution on hydraulic conductivities of sand-bentonite mixture backfill. Appl. Clay Sci. 26, 13–19 (2004)
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Kale, R.C., Bhanwariwal, K., Ravi, K. (2021). Effect of Alkaline Environment on the Swell Pressures of Compacted Bentonite Under Thermal History. In: Patel, S., Solanki, C.H., Reddy, K.R., Shukla, S.K. (eds) Proceedings of the Indian Geotechnical Conference 2019 . Lecture Notes in Civil Engineering, vol 134. Springer, Singapore. https://doi.org/10.1007/978-981-33-6370-0_4
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