Data/hora: 26/06/2024 15:08:58

Biblioteca(s): | Epagri-Sede.
Data corrente: | 21/07/2011
Data da última atualização: | 21/07/2011
Autoria: | MARKGRAF, W.; HORN, R.; REICHERT, J. M.; REINERT, D. J.; VEIGA, M. da; FLEIGE, H.; GEBHARDT, H.; STRECK, C. A.
Afiliação: | Epagri
Título: | Rheological investigations of four brazilian oxisols and a vertisol.
Ano de publicação: | 2006
Fonte/Imprenta: | In: REUNIÃO BRASILEIRA DE MANEJO E CONSERVAÇÃO DO SOLO E DA ÁGUA, 16., 2006, Aracajú, SE. Resumos e palestras... Aracajú, SE: SBCS, 2006. p. 1-5.
Idioma: | Português
Conteúdo: | Rheological investigations of bentonite suspensions (Ibeco Seal-80), silt- and clay-rich substrates corroborate the hypothesis, that the application of a parallel-plate-rheometer (MCR 300, Anton Paar) is appropriate for a description and quantification of microstructural changes on a particle-particle-scale. Amplitude sweep tests with controlled shear deformation (CSD) have been conducted on homogenised substrates deriving from four montmorillonitic, Fe-oxide-rich Brazilian Oxisols and a kaolinitic Vertisol confirm the applicability of such measuring device in soil mechanics. The influence of soil organic matter (SOM), Fe-oxides, and clay minerals on micromechanical shear behaviour under oscillation has been tested under saturated and drained (@-60hPa) conditions. From collected data, which include parameters as G? (storage modulus), G? (loss modulus), linear viscoelastic (LVE) range and a deformation limit (gL), the dissipation of elasticity in a viscoelastic substance i.e. soil, can be retraced. A comparison of this data has led to the assumption that Fe-oxides are supposed to have a more stabilising effect (s. occurance of pseudosand) than SOM.
Palavras-Chave: | Amplitude sweep tests; Microstructure; Rheology.
Categoria do assunto: | --
URL: | http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_4952.pdf
Registro original: | Epagri-Sede (Epagri-Sede)
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