Engineering Applications in Permafrost Areas 453 Electrical freezing potentials and the migration of moisture and ions in freezing soils
In continuation of work previously reported on freezing potentials, this paper reports voltages meas-ured at a constant freezing rate (interface advancing at 2.8 x 10-4 cm/s) and amounts of electric charge required to neutralize the displacement of charge produced by freezing, in sludges consisting...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.532.6108 http://pubs.aina.ucalgary.ca/cpc/CPC4-453.pdf |
| Summary: | In continuation of work previously reported on freezing potentials, this paper reports voltages meas-ured at a constant freezing rate (interface advancing at 2.8 x 10-4 cm/s) and amounts of electric charge required to neutralize the displacement of charge produced by freezing, in sludges consisting of silica, kaolin, and bentonite. For the freezing potential, a model is proposed which takes into account the diffusion of cations in the unfrozen portion of the sample, the separation of ions at the freezing front, and the migration of moisture and ions towards the freezing front. Results calculated from this model are compared with experimental values of the potential. In connection with the meas-urements of electric charge, in the order of 1 to 100 p Coul., a model is discussed based on the electrical double layer which forms at the surface of a mineral surrounded by water. Further studies should aid understanding of water migration and corrosion in freezing soils. Faisant suite aux travaw deja signalis concernant les potentiels de gel, la prksente etude signale les tensions mesurkes pour des vitesses d’engel constantes (progression de I’interface a 2,8 x cm/s) et la charge necessaire pour equilibrer le dkplacement de charge produit par l’engel dans des boues composkes de silice, de kaolin et de bentonite. On propose, pour le potentiel de gel, un modkle tenant compte de la diffusion de cations dans la partie non gel & de I’khantillon, de la skparation des ions au front de gel et de la migration de I’humiditk et des ions vers le front de gel: les rksultats calcules a I’aide de ce modkle sont comparks aux valeurs expkrimentales du potentiel. On mesure la charge electrique en fonction de la couche Clectrique double qui se forme a la surface d’un minkral entourk d’eau. On soutient que la poursuite de ces recherches devrait permettre d’approfondir nos connaissances sur la migration de I’eau et la corrosion dans les sols soumis au gel. Proc. 4th Can. Permafrost Conf. (1982) |
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