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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Thermal and electrical conduction in unsaturated sand controlled by surface wettability
Abstract Water repellency has significant implications on the thermal and electrical conduction properties of unsaturated soils, but less understood. This study presents the results of a laboratory study that show the evolution of thermal and electrical conductivity of unsaturated hydrophilic and hydrophobic soils with degree of water saturation using surface synthesized soils. Sand particles were chemically grafted with a thermal-sensitive polymer to make their surfaces hydrophobic at a critical elevated temperature. A transient line source heating method and two-terminal electrode system were used to obtain the thermal and electrical conductivities of the hydrophilic and hydrophobic specimens. A controlled drying process was used to change the degree of saturation while capturing the intended properties. The different capillarity and the corresponding distribution of the water phase in pore space driven by the surface wettability greatly influenced the thermal and electrical conduction behaviors of the sands at unsaturated conditions.
Thermal and electrical conduction in unsaturated sand controlled by surface wettability
Abstract Water repellency has significant implications on the thermal and electrical conduction properties of unsaturated soils, but less understood. This study presents the results of a laboratory study that show the evolution of thermal and electrical conductivity of unsaturated hydrophilic and hydrophobic soils with degree of water saturation using surface synthesized soils. Sand particles were chemically grafted with a thermal-sensitive polymer to make their surfaces hydrophobic at a critical elevated temperature. A transient line source heating method and two-terminal electrode system were used to obtain the thermal and electrical conductivities of the hydrophilic and hydrophobic specimens. A controlled drying process was used to change the degree of saturation while capturing the intended properties. The different capillarity and the corresponding distribution of the water phase in pore space driven by the surface wettability greatly influenced the thermal and electrical conduction behaviors of the sands at unsaturated conditions.
Thermal and electrical conduction in unsaturated sand controlled by surface wettability
Dong, Yi (Autor:in) / Pamukcu, Sibel (Autor:in)
Acta Geotechnica ; 10 ; 821-829
01.05.2014
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Electrical conductivity , Hydrophobic soil , Pore water distribution , Reversible wettability , Thermal conductivity , Thermal-sensitive polymer , Unsaturated soil Engineering , Geoengineering, Foundations, Hydraulics , Continuum Mechanics and Mechanics of Materials , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics , Structural Mechanics
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