Université Paris-Est , Laboratoire Navier (UMR 8205), CNRS, ENPC, IFSTTAR, 6 & 8 Avenue Blaise Pascal, 77455 Marne-la-Vallée, France.
Langmuir. 2017 Nov 7;33(44):12766-12776. doi: 10.1021/acs.langmuir.7b03198. Epub 2017 Oct 26.
Adsorption plays a fundamental role in the behavior of clays. Because of the confinement between solid clay layers on the nanoscale, adsorbed water is structured in layers, which can occupy a specific volume. The transition between these states is intimately related to key features of clay thermo-hydro-mechanical behavior. In this article, we consider the hydration states of clays as phases and the transition between these states as phase changes. The thermodynamic formulation supporting this idea is presented. Then, the results from grand canonical Monte Carlo simulations of sodium montmorillonite are used to derive hydration phase diagrams. The stability analysis presented here explains the coexistence of different hydration states at clay particle scale and improves our understanding of the irreversibilities of clay thermo-hydro-mechanical behavior. Our results provide insights into the mechanics of the elementary constituents of clays, which is crucial for a better understanding of the macroscopic behavior of clay-rich rocks and soils.
吸附在粘土的行为中起着基础性的作用。由于固体粘土层在纳米尺度上的限制，吸附水在层中被结构化，这会占据特定的体积。这些状态之间的转变与粘土热-水-力学行为的关键特征密切相关。在本文中，我们将粘土的水合状态视为相态，而这些状态之间的转变视为相变。提出了支持这一观点的热力学公式。然后，使用对钠蒙脱石的巨正则蒙特卡罗模拟的结果来推导水合相图。本文的稳定性分析解释了粘土颗粒尺度上不同水合状态的共存，并提高了我们对粘土热-水-力学行为不可逆性的理解。我们的研究结果提供了对粘土基本组成部分力学行为的深入了解，这对于更好地理解富含粘土的岩石和土壤的宏观行为至关重要。
