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Estimation of water retention behaviour of bentonite based on mineralogy and mercury intrusion porosimetry tests
Géotechnique ( IF 5.8 ) Pub Date : 2020-12-14 , DOI: 10.1680/jgeot.18.p.220
Ayman A. Abed 1 , Wojciech T. Sołowski 1
Affiliation  

In this paper a water retention model is developed based on soil mineralogy and microscopic features of material behaviour. The model estimates the water content at a given total suction as the sum of the bentonite minerals’ interlayer water and water in the interparticle pores. The paper proposes simple formulae to estimate the interlayer water content and interlayer void ratio based on mineralogical properties. Additionally, the model uses mercury intrusion porosimetry (MIP) measurements to approximate the water content in the larger pores. The validation of the proposed procedure relies on published data for MX-80 and GMZ bentonites and yields promising results. Even though the discussion and the validation are restricted to bentonite here, the procedure is generic in nature and can be modified easily for other geomaterials. The paper also offers insights into the links between a soil's microstructure and its macroscopic behaviour. The contribution provides a new tool for quick indirect estimation of the water retention behaviour of porous materials with known mineral composition and available microstructural data – for example, based on the MIP tests. Such a tool is of great practical interest in design – for example, nuclear waste repositories, where a large material pool may be considered initially.

中文翻译:

基于矿物学和压汞法测试膨润土的保水性能

本文基于土壤矿物学和物质行为的微观特征建立了保水模型。该模型将给定的总吸力下的水含量估算为膨润土矿物的夹层水和颗粒间孔隙中水的总和。本文提出了基于矿物学性质估算层间含水量和层间空隙率的简单公式。此外,该模型使用压汞法(MIP)进行测量,以近似较大孔隙中的水含量。所提议程序的验证依赖于MX-80和GMZ膨润土的公开数据,并产生了可喜的结果。尽管此处的讨论和验证仅限于膨润土,但该程序本质上是通用的,可以轻松地针对其他土工材料进行修改。本文还提供了对土壤微观结构与其宏观行为之间联系的见解。该贡献提供了一种新的工具,可以快速间接地评估具有已知矿物成分和可用的微结构数据的多孔材料的保水性能,例如,基于MIP测试。这种工具在设计中具有极大的实际意义,例如,核废料储存库,最初可能会考虑使用大量的材料库。
更新日期:2020-12-14
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