Estimation of water retention behaviour of bentonite based on mineralogy and mercury intrusion porosimetry tests

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.

Automated summary

A water retention model based on soil mineralogy and microscopic features of material behavior is developed in this paper, with simple formulae proposed to estimate water content and interparticle void ratio. The model's validation using published data for bentonites shows promising results, indicating its potential applicability to other geomaterials. The insights provided into the links between microstructure and macroscopic behavior offer a valuable tool for indirect estimation of water retention behavior in porous materials with known mineral composition and microstructural data.