Abstract
Rheological properties of kaolinite, montmorillonite, ferralitic soil of the humid subtropics (Norfolk island, southwest of Oceania), alluvial clay soil of arid subtropics (Konyaprovince, Turkey) and carbonate loess loam of Russian forest-steppe zone were determined. A parallel plate rheometer MCR-302 (Anton Paar, Austria) was used in order to conduct amplitude sweep test. Rheological properties allow to assess quantitatively structural bonds and estimate structural resistance to a mechanical impact. Measurements were carried out on samples previously pounded and capillary humidified during 24 hours. In the amplitude sweep method an analyzed sample was placed between two plates. The upper plate makes oscillating motions with gradually extending amplitude. Software of the device allows to receive several rheological parameters such as elastic modulus (G’, Pa), viscosity modulus (G", Pa), linear viscoelasticity range (G’>>G”), and point of destruction of structure at which the elastic modulus becomes equal to the viscosity modulus (G’=G”- crossover). It was found out that in the elastic behavior at G '>> G " strength of structural links of kaolinite, alluvial clay soil and loess loam constituted one order of 105 Pa. Montmorillonit had a minimum strength - 104 Pa and ferrallitic soil of Norfolk island [has] - a maximum one -106 Pa. At the same time montmorillonite and ferralitic soil were characterized by the greatest plasticity. Destruction of their structure (G '= G") took place only in the cases when strain was reaching 11-12%. Destraction of the kaolinite structure happened at 5% of deformation and of the alluvial clay soil and loess loam - at 4.5%.
Keywords
soil mechanics soil structure rheology storage modulus loss modulus linear viscoelastic range
References
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Abstract
References
- Gorbunov. N.I. 1974. Colloid chemistry and mineralogy of soils. Moscow, "Nauka", p.313
- Gummatov, N.G., Pachepsky, I.A., 1991. Modern ideas about the structure of the soil and structure, mechanisms and models. Pushchino, Russia. p.32
- Khaydapova, D., Milanovskiy, E.Yu., Shein, E.V., 2013 Impact of Antropogenic Load on Rheological Properties of Typical Chernozems (Kursk region, Russia) Soil Degradation. Advances in Geoecology 42, Catena VERLAG GMBH, Germany, p.62-71
- Loze, Zh., Mate, K., 1998. Glossary of Soil Science, Wiley, "Mir" p.398
- Markgraf, W., Horn, R., Peth, S., 2006. An approach to rheometry in soil mechanics-structural changes in bentonite, clayey and silty soils. Soil and Tillage Research 91: 1-14
- Mezger, T.G., 2011. The Rheology Handbook. Hanover: Vincentz Network, Germany, p.432
- Milanovskiy, E.Yu., 2009. Soil humic substances as natural hydrophobic-hydrophilic compounds. Moscow publishing house "Geos" p.185
- Shein, E.V., Milanovskii, E.Y., 2003. The role of organic matter in the formation and stability of soil aggregates. Eurasian Soil Science 36: 51-59.
- Sokolov, V.N., 1973. Influence of mineralogical composition on the strength of the structural bonds of clay particles. Vestnik, ser. geologiya, No. 4, p. 114-117
Details
| Primary Language | English |
|---|---|
| Journal Section | Articles |
| Authors | |
| Publication Date | July 15, 2015 |
| Published in Issue | Year 2015 Volume: 4 Issue: 3 |