| 土性对工程泥浆固化强度影响规律及微观机理 |
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| 关键词:super-absorbent polymer liquid limit kaolin clay microscopic mechanism unconfined compressive strength |
| 基金项目:国家自然科学基金项目(编号: 52178328);中国矿业大学深部岩土力学与地下工程国家重点实验室开放基金课题(编号: SKLGDUEK2114) |
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| 摘要: |
| The Influence of Soil Properties on the Stabilization Strength of Engineering Slurry and Its Micro-mechanism |
| A series of unconfined compressive strength tests were carried out on engineering slurries stabilized with super-absorbent polymer at different liquid limits. The influence of the liquid limit of slurry on the stabilization efficiency is discussed. Furthermore, the impact of kaolin clay on the stabilization efficiency at the same liquid limit was compared. Finally, based on XRD and SEM microscopic observations, the micro-mechanism of the influence of liquid limit and kaolin on the strength improvement was revealed. The results showed that when the liquid limit of the slurry increased, the unconfined compressive strength (qu) of stabilized soil gradually decreased, i.e., the solidification efficiency significantly decreased with the increase in slurry liquid limit. When the liquid limit increased by 10%, qu decreased by 48.2% on average. In contrast, qu of stabilized soil significantly increased by adding kaolin clay. This effect on the strength enhancement was greatly enhanced with increased curing times. By adding 40% kaolin clay at 90 days of curing, qu increased by 1.17 times. The microscopic test results demonstrated that the change of liquid limit had little effect on the magnitude of hydration product. The main reason for qu decreasing with liquid limit was that the micropores of stabilized soil increased with increased liquid limit, resulting in a loose fabric with increased slurry liquid limit. In contrast, the amount of hydration products significantly increased for stabilized soil after adding kaolin clay, leading to the enhancement of the cementation structure of the stabilized soil, eventually resulting in improvement of its strength. These behaviors suggested that for the utilization of engineering slurry in actual projects, the adjustment of liquid limit of slurry onsite can be used to improve the stabilization efficiency. Meanwhile, kaolin-based wastes (such as kaolin tailings) can be added as an additional binder to improve stabilization efficiency, thereby contributing to a green and environmentally sustainable strategy. |
| BIAN Xia,YE Yingchun,LIU Kai,LI Xiaozhao,FAN Zhuyi,GUO Guangze,ZHANG Wei.2024.The Influence of Soil Properties on the Stabilization Strength of Engineering Slurry and Its Micro-mechanism[J].Acta Geoscientica Sinica,45(1):123-130. |
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