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<p>In the modern world, the question of ensuring the safety of radioactive waste storage and disposal facilities has generated a lot of discussion in the scientific community. One of the most promising approaches to solving this problem is creating disposal in deep geological formations. Bentonite, due to its wide range of properties, is considered a promising material for creating engineering barrier system for radioactive waste disposal. The creation of engineering barrier systems defines the importance of studying the properties of barrier materials under model burial conditions, including at elevated temperatures. Features of changes in the strength properties of clays during heating are largely determined by the parameters of the double layer, which strongly depend on the mineral composition. Research was conducted to study the microstructure and strength properties of samples based on clay minerals – kaolinite and smectite. Some tests were conducted at a temperature of 80&#xa0;°C to simulate the most expected conditions of radioactive waste disposal. Under the influence of elevated temperatures, an increase in aggregation is observed, which leads to an increase in the heterogeneity of the structure and a decrease in strength properties. This transformation is due to the thermal evolution of double layers caused by the distribution of forces under the influence of a temperature gradient. The results obtained in the course of the research can be used from a practical point of view when considering the issue of ensuring the safety of the operation of radioactive waste deep geological disposal. The presented work can be considered as a continuation of previous well-known research on the influence of high temperature on clay properties based on the DLVO (Derjaguin, Landau, Verwey, Overbeek) theory.</p>

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Effect of temperature increase from 20 to 80 °C on the structure and strength properties of model clay soils

  • 期刊论文

  • 发表日期：

    2026年6月19日

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  • A. D. Kutkhudzhina,
  • A.B. Ermolinskiy,
  • M.S. Chernov,
  • T.A. Koroleva,
  • O.V. Razgulina,
  • V. V. Krupskaya

摘要

In the modern world, the question of ensuring the safety of radioactive waste storage and disposal facilities has generated a lot of discussion in the scientific community. One of the most promising approaches to solving this problem is creating disposal in deep geological formations. Bentonite, due to its wide range of properties, is considered a promising material for creating engineering barrier system for radioactive waste disposal. The creation of engineering barrier systems defines the importance of studying the properties of barrier materials under model burial conditions, including at elevated temperatures. Features of changes in the strength properties of clays during heating are largely determined by the parameters of the double layer, which strongly depend on the mineral composition. Research was conducted to study the microstructure and strength properties of samples based on clay minerals – kaolinite and smectite. Some tests were conducted at a temperature of 80 °C to simulate the most expected conditions of radioactive waste disposal. Under the influence of elevated temperatures, an increase in aggregation is observed, which leads to an increase in the heterogeneity of the structure and a decrease in strength properties. This transformation is due to the thermal evolution of double layers caused by the distribution of forces under the influence of a temperature gradient. The results obtained in the course of the research can be used from a practical point of view when considering the issue of ensuring the safety of the operation of radioactive waste deep geological disposal. The presented work can be considered as a continuation of previous well-known research on the influence of high temperature on clay properties based on the DLVO (Derjaguin, Landau, Verwey, Overbeek) theory.