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<p>To investigate the effects of thermal aging on the swelling pressure of bentonite, compacted Gaomiaozi (GMZ) bentonite samples were thermally aged at 90&#xa0;°C and 150&#xa0;°C for durations of 60–360 days and then tested for swelling pressure using the constant-volume method. The results demonstrated that thermal aging significantly reduced the swelling pressure of GMZ bentonite. The swelling pressure decreased progressively with elevated temperature and prolonged aging time, exhibiting distinct temperature- and time-dependent behavior. After 360 days of aging at 90&#xa0;°C and 300 days at 150&#xa0;°C, the maximum swelling pressure declined by 47% and 50%, respectively. Microstructural analysis revealed that thermal aging modified the pore structure of GMZ bentonite, reducing inter-aggregate pores while increasing the proportions of intra-aggregate and extremely small pores. Elevated temperatures accelerated water redistribution within the compacted bentonite. This accelerated water redistribution is identified as the dominant mechanism underlying the reduction in swelling pressure after thermal aging.</p>

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Study on the influence of thermal aging on the swelling properties of GMZ bentonite

  • 期刊论文

  • 发表日期：

    2025年5月26日

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  • Wei Liu,
  • Dong Liang,
  • Zhongtian Yang,
  • Chao Gao,
  • Jingli Xie

摘要

To investigate the effects of thermal aging on the swelling pressure of bentonite, compacted Gaomiaozi (GMZ) bentonite samples were thermally aged at 90 °C and 150 °C for durations of 60–360 days and then tested for swelling pressure using the constant-volume method. The results demonstrated that thermal aging significantly reduced the swelling pressure of GMZ bentonite. The swelling pressure decreased progressively with elevated temperature and prolonged aging time, exhibiting distinct temperature- and time-dependent behavior. After 360 days of aging at 90 °C and 300 days at 150 °C, the maximum swelling pressure declined by 47% and 50%, respectively. Microstructural analysis revealed that thermal aging modified the pore structure of GMZ bentonite, reducing inter-aggregate pores while increasing the proportions of intra-aggregate and extremely small pores. Elevated temperatures accelerated water redistribution within the compacted bentonite. This accelerated water redistribution is identified as the dominant mechanism underlying the reduction in swelling pressure after thermal aging.