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Journal of Shanghai University >

2022 , Vol. 28 >Issue 1: 132 - 144

DOI: https://doi.org/10.12066/j.issn.1007-2861.2238

Research Articles

Swelling characteristics of a mixture of crushed granite and bentonite under the condition of alkali-thermo coupling

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  • School of Civil Engineering, Shanghai University, Shanghai 200444, China

Received date: 2020-02-26

  Online published: 2020-07-06

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Abstract

During the life of a high-level radioactive waste repository, the decay heat of nuclear waste and alkaline pore water produced by the aging of concrete affect the working performance of the buffer material. To study the effects of alkali-thermo coupling on the swelling characteristics of buffer materials, NaOH solution is used in this study to simulate alkaline pore water, and a water bath pot is used to provide a constant temperature solution, where the solution is continuously circulated in a self-developed corrosion-resistant consolidator. The evolution curves of the swelling force are obtained through swelling force experiments under concentrations of 0.1, 0.5, and 1.0 mol/L and temperatures of 25 $^\circ$C and 50 $^\circ$C. Results showed that at the same temperature, the maximum and final swelling force of the sample decreased with an increase in the solution concentration. In addition, at the same concentration of alkaline solution infiltration, the maximum and final swelling force of the sample decreased with an increase in the granite mixing rate. Under the same granite mixing rate and same infiltration solution, the maximum and final swelling force of the sample decreased with an increase in temperature. The attenuation degree of swelling force increased with increases in solution concentration and temperature. For the mixture of crushed granite and bentonite, under the same temperature and same infiltration solution, the attenuation degree of swelling force decreased with an increase in the granite mixing rate.

Key words： alkali-thermo coupling; bentonite; crushed granite; swelling force; granite mixing rate

Cite this article

QIN Aifang, HU Hongliang . Swelling characteristics of a mixture of crushed granite and bentonite under the condition of alkali-thermo coupling[J]. Journal of Shanghai University, 2022 , 28(1) : 132 -144 . DOI: 10.12066/j.issn.1007-2861.2238

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