BEHAVIOR OF NATURAL FINE SOIL PARTICLES DISPERSIONS IN NON-AQUEOUS PHASE LIQUIDS

FRANCISCA, FRANCO M.; MARCOS ALEXIS MONTORO

JOURNAL OF ENVIRONMENTAL ENGINEERING

ASCE-AMER SOC CIVIL ENGINEERS

Lugar: Reston, Virginia; Año: 2021

0733-9372

Understanding and quantifying particle-fluid interaction (PFI) is of fundamental importance for such geoenvironmental issues as polluted soil behavior, transport of organic contaminant in porous media, and the behavior of slurries in contact with non-aqueous phase liquids (NAPLs). NAPLs have a very low dielectric permittivity in comparison to water, and therefore significant changes in soil properties can be expected as a consequence of PFI. This study evaluates interactions between soil particles and NAPLs using the rheology measurement of loess silt, zeolite and bentonite particle concentrated dispersions. The dispersing liquids were kerosene, two paraffin oils with different viscosities and deionized water (DIW) as a reference liquid. The results show the influence of the volumetric content of particles on the undrained shear strength of dispersions. The effect of suspending fluid viscosity and the magnitude of PFI was analyzed in a novel way by comparing the volume of particles for which the dispersion presents an undrained shear stress of 1 Pa determined for two different fluids. These results highlight the importance of PFI in the macroscopic properties of soils, hydraulic conductivity and liquid limit.