Rheological properties of different minerals and clay soils

Authors : Dolgor KHAYDAPOVA, Evgeny MİLANOVSKİY, Evgeny SHEİN

Pages : 198-202

Doi:10.18393/ejss.2015.3.198-202

View : 13 | Download : 7

Publication Date : 2015-07-15

Article Type : Research Paper

Abstract :Rheological properties of kaolinite, montmorillonite, ferralitic soil of the humid subtropics insert ignore into journalissuearticles values(Norfolk island, southwest of Oceania);, alluvial clay soil of arid subtropics insert ignore into journalissuearticles values(Konyaprovince, Turkey); and carbonate loess loam of Russian forest-steppe zone were determined. A parallel plate rheometer MCR-302 insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(G’, Pa);, viscosity modulus insert ignore into journalissuearticles values(G`, Pa);, linear viscoelasticity range insert ignore into journalissuearticles values(G’>>G”);, and point of destruction of structure at which the elastic modulus becomes equal to the viscosity modulus insert ignore into journalissuearticles values(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 10 5 Pa. Montmorillonit had a minimum strength - 10 4 Pa and ferrallitic soil of Norfolk island [has] - a maximum one -10 6 Pa. At the same time montmorillonite and ferralitic soil were characterized by the greatest plasticity. Destruction of their structure insert ignore into journalissuearticles values(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