利用二氧化碳诱导的碳酸镁改变塑料粘土的性能

IF 2.2 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Minerals Pub Date : 2024-08-28 DOI:10.3390/min14090876
Hadi Mohamadzadeh Romiani, Hamed Abdeh Keykha, Saeed Chegini, Afshin Asadi, Satoru Kawasaki
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引用次数: 0

摘要

高塑性粘土给工程项目带来了巨大挑战。尽管许多技术在实施和环境影响方面都面临困难,但人们还是采用了各种技术来提高它们的性能。本研究探讨了二氧化碳诱导碳酸镁对改善可塑粘土岩土行为的影响。二氧化碳诱导碳酸镁是通过矿物碳化产生的,用于改善高塑性天然粘土的性能。将二氧化碳气体注入氢氧化钠溶液,产生碳酸根离子(CO32-)。在碳酸根离子溶液中加入硫酸镁溶液,在实验室规模上沉淀出碳酸镁。粘土样本取自伊朗阿拉克附近梅甘平原的试验坑。粘土样本用不同比例的生成碳酸镁处理。研究了经处理和未处理样本的各种参数,包括指数特性、非压缩强度、固结行为和膨胀潜力。研究发现,随着碳酸镁含量的增加,处理过的粘土的液限和塑性指数都有所下降。在高塑性粘土中添加 15%的碳酸镁后,土壤分类从高塑性粘土(CH)变为低塑性粉土(ML)。处理过的粘土的非收缩抗压强度增加了。此外,随着碳酸镁含量的增加,处理过的粘土的固结行为和膨胀指数也得到了改善。这项研究证实,二氧化碳诱导碳酸镁是一种很有前途的材料,可改善高塑性粘土的行为,为环境管理提供了一种可持续的方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Utilizing Magnesium Carbonate Induced by CO2 to Modify the Performance of Plastic Clay
Highly plastic clays pose significant challenges in engineering projects. Various techniques have been employed to enhance their properties, though many face difficulties related to implementation and environmental impact. This study examines the effect of CO2-induced magnesium carbonate on improving the geotechnical behavior of plastic clay. CO2-induced magnesium carbonate was produced via mineral carbonation and used to improve the behavior of highly plastic natural clay. CO2 gas was injected into a sodium hydroxide solution to produce carbonate ions (CO32−). Magnesium carbonate was precipitated on a laboratory scale by adding magnesium sulfate solution to the carbonate ion solution. Clayey soil samples were obtained from test pits in the Meyghan Plain near Arak, Iran. The clay samples were treated with different percentages of the produced magnesium carbonate. Various parameters of the treated and untreated samples, including index properties, unconfined compressive strength, consolidation behavior, and swelling potential, were studied. It was found that the liquid limit and plasticity index of the treated clay decreased as the magnesium carbonate content increased. The soil classification changed from high plastic clay (CH) to low plastic silt (ML) with the addition of 15% magnesium carbonate to the highly plastic clay. The unconfined compressive strength of the treated clay increased. Additionally, the consolidation behavior and swelling index of the treated clay improved as the magnesium carbonate content increased. This study confirms that CO2-induced magnesium carbonate is a promising material for improving the behavior of highly plastic clays, offering a sustainable approach to environmental management.
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来源期刊
Minerals
Minerals MINERALOGY-MINING & MINERAL PROCESSING
CiteScore
4.10
自引率
20.00%
发文量
1351
审稿时长
19.04 days
期刊介绍: Minerals (ISSN 2075-163X) is an international open access journal that covers the broad field of mineralogy, economic mineral resources, mineral exploration, innovative mining techniques and advances in mineral processing. It publishes reviews, regular research papers and short notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.
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