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

IF 2.8 4区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Environmental Earth Sciences Pub Date : 2025-05-26 DOI:10.1007/s12665-025-12333-x

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

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Abstract

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.

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热老化对GMZ膨润土膨胀性能影响的研究

为了研究热老化对膨润土膨胀压力的影响，将高庙子（GMZ）膨润土压实样品在90℃和150℃下热老化60-360天，然后用等体积法测试膨胀压力。结果表明，热老化显著降低了GMZ膨润土的膨胀压力。膨胀压力随温度升高和老化时间延长而逐渐降低，表现出明显的温度和时间依赖性。90℃时效360天和150℃时效300天后，最大膨胀压力分别下降了47%和50%。显微结构分析表明，热老化改变了GMZ膨润土的孔隙结构，减少了团聚间孔隙，增加了团聚内孔隙和极小孔隙的比例。升高的温度加速了水在压实的膨润土中的再分配。这种加速的水分再分配被认为是热老化后膨胀压力降低的主要机制。

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来源期刊

Environmental Earth Sciences 环境科学-地球科学综合

CiteScore

5.10

自引率

3.60%

发文量

494

审稿时长

8.3 months

期刊介绍： Environmental Earth Sciences is an international multidisciplinary journal concerned with all aspects of interaction between humans, natural resources, ecosystems, special climates or unique geographic zones, and the earth: Water and soil contamination caused by waste management and disposal practices Environmental problems associated with transportation by land, air, or water Geological processes that may impact biosystems or humans Man-made or naturally occurring geological or hydrological hazards Environmental problems associated with the recovery of materials from the earth Environmental problems caused by extraction of minerals, coal, and ores, as well as oil and gas, water and alternative energy sources Environmental impacts of exploration and recultivation – Environmental impacts of hazardous materials Management of environmental data and information in data banks and information systems Dissemination of knowledge on techniques, methods, approaches and experiences to improve and remediate the environment In pursuit of these topics, the geoscientific disciplines are invited to contribute their knowledge and experience. Major disciplines include: hydrogeology, hydrochemistry, geochemistry, geophysics, engineering geology, remediation science, natural resources management, environmental climatology and biota, environmental geography, soil science and geomicrobiology.