Water distribution variation in partially saturated granular materials using neutron imaging / Felix H. Kim in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 2 (Fevrier 2012)  

Public ISBD [article]  inJournal of geotechnical and geoenvironmental engineering > Vol. 138 N° 2 (Fevrier 2012) . - pp. 147-154 Titre : Water distribution variation in partially saturated granular materials using neutron imaging Type de document : texte imprimé Auteurs : Felix H. Kim, Auteur ; Penumadu, Dayakar, Auteur ; Daniel S. Hussey, Auteur Année de publication : 2012 Article en page(s) : pp. 147-154 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Imaging Sand Water Partially Saturated Neutrons X-rays Tomography Three dimensional Quantification Résumé : The use of neutron imaging is demonstrated for visualizing and quantifying water distribution in partially saturated granular porous media. Because of the unique difference in the total neutron cross sections of water, sand, and air, a significant contrast for the three phases is observed in a neutron transmission image, and a quantitative analysis provides detailed information on the arrangement and distribution of particles, voids, and water. The experiments in this study are performed at the Neutron Imaging Facility (NIF) at the National Institute of Standard and Technology (NIST). An amorphous silicon flat panel detector was used in this research with a spatial resolution of approximately 250 μm (127  μm/pixel). The effect of particle morphology on water distribution in compacted granular columns is investigated by using round and angular silica sand. Silica sand specimens with different bulk gravimetric water contents (0%, 6%, 9%, and 12%) are studied for evaluating the water phase-distribution spatially for compacted sand specimens in an aluminum cylinder. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v138/i2/p147_s1?isAuthorized=no [article] Water distribution variation in partially saturated granular materials using neutron imaging [texte imprimé] / Felix H. Kim, Auteur ; Penumadu, Dayakar, Auteur ; Daniel S. Hussey, Auteur . - 2012 . - pp. 147-154. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 2 (Fevrier 2012) . - pp. 147-154 Mots-clés : Imaging Sand Water Partially Saturated Neutrons X-rays Tomography Three dimensional Quantification Résumé : The use of neutron imaging is demonstrated for visualizing and quantifying water distribution in partially saturated granular porous media. Because of the unique difference in the total neutron cross sections of water, sand, and air, a significant contrast for the three phases is observed in a neutron transmission image, and a quantitative analysis provides detailed information on the arrangement and distribution of particles, voids, and water. The experiments in this study are performed at the Neutron Imaging Facility (NIF) at the National Institute of Standard and Technology (NIST). An amorphous silicon flat panel detector was used in this research with a spatial resolution of approximately 250 μm (127  μm/pixel). The effect of particle morphology on water distribution in compacted granular columns is investigated by using round and angular silica sand. Silica sand specimens with different bulk gravimetric water contents (0%, 6%, 9%, and 12%) are studied for evaluating the water phase-distribution spatially for compacted sand specimens in an aluminum cylinder. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v138/i2/p147_s1?isAuthorized=no

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