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Formation and development of salt crusts on soil surfaces
Authors:Sheng Dai  Hosung Shin  J Carlos Santamarina
Institution:1.School of Civil and Environmental Engineering,Georgia Institute of Technology,Atlanta,USA;2.School of Civil and Environmental Engineering,University of Ulsan,Ulsan,South Korea;3.Earth Science and Engineering,King Abdullah University of Science and Technology,Thuwal,Saudi Arabia
Abstract:The salt concentration gradually increases at the soil free surface when the evaporation rate exceeds the diffusive counter transport. Eventually, salt precipitates and crystals form a porous sodium chloride crust with a porosity of 0.43 ± 0.14. After detaching from soils, the salt crust still experiences water condensation and salt deliquescence at the bottom, brine transport across the crust driven by the humidity gradient, and continued air-side precipitation. This transport mechanism allows salt crust migration away from the soil surface at a rate of 5 μm/h forming salt domes above soil surfaces. The surface characteristics of mineral substrates and the evaporation rate affect the morphology and the crystal size of precipitated salt. In particular, substrate hydrophobicity and low evaporation rate suppress salt spreading.
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