Properties of the Loess Sediments in Ostrava Region (Czech Republic) and Comparison with Some Other Loess Sediments

Marschalko, Marián; Yilmaz, Işık; Fojtová, Lucie; Lamich, David; Bednařík, Martin

doi:10.1155/2013/529431

Cited by 3 publications

(1 citation statement)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Loessial soils cover approximately 10% of the continents, including North America, Europe, Asia and South America (Rinaldi et al, 2007). The most significant loess formations are found in Argentina (Iriondo, 1997;Zárate, 2003), the Czech Republic (Marschalko et al, 2013), China (Kukla and An, 1989), Russia (Little et al, 2002), Spain (Günster et al, 2001) and the USA (Leighton and Willman, 1950). All these formations are characterised by a macroporous structure with very high void ratio (typically from 0·9 to 1·25), predominantly fine granulometry mainly composed of silt-and clay-size particles and poorly accommodated structure.…”

Section: Main Characteristics Of Loessmentioning

confidence: 99%

Geothermal energy in loess

BidarmaghzAsal

Makasis

NarsilioGuillermo

et al. 2016

Environmental Geotechnics

View full text Add to dashboard Cite

Ground-source heat pump (GSHP) systems efficiently heat and cool buildings by using sustainable geothermal energy accessed by way of ground heat exchangers (GHEs). Loess covers vast parts of the world, about 10% of the landmass; therefore, the use of piles or 'micropiles' is extensive in these areas, particularly where the thickness of loessic soils is significant. These deep foundations have the potential to be used as 'energy piles' in GSHP systems, with a minimal additional cost. This paper presents a case study of a representative real building in Córdoba, Argentina, where foundations are also used as GHEs. The thermal properties of local soils were experimentally measured and used in recently developed detailed state-of-the-art finite-element models. Results from the realistic simulations show that the partial substitution of electrical heating and cooling systems with geothermal systems could significantly reduce energy consumption and the size of associated infrastructure, despite the relatively low thermal conductivity of local loess. Moreover, the effects of surface air temperature fluctuations, which are routinely ignored in GHE design, are accounted for in these simulations. This case study shows the potential of GSHP technology in loessic environments and gives incentives to engineers to start considering the technology in their designs and practices.

show abstract

Section: Main Characteristics Of Loessmentioning

confidence: 99%

Geothermal energy in loess

BidarmaghzAsal

Makasis

NarsilioGuillermo

et al. 2016

Environmental Geotechnics

View full text Add to dashboard Cite

show abstract

Surface runoff on loess: an example of a commonly overlooked hazardous process from northeast Czech Republic

Niemiec

Marschalko

Yilmaz

et al. 2019

Bull Eng Geol Environ

View full text Add to dashboard Cite

Improvement of Physical-Chemical and Rheological Properties of Ghardaïa Loess (Southern Algeria) Using Bentonite Clay and Lime

Rahmani

Hazzab

Aimer

et al. 2020

Clays and clay miner.

View full text Add to dashboard Cite

Loess is a collapsible soil; when it collapses, it can cause significant damage to structures built on it. Improvement in the stability and strength performance of loess is necessary to meet engineering needs. In the present study, the effects on the physical-chemical and rheological characteristics of Ghardaïa loess of adding bentonite and lime (southern Algeria) were examined. Rheological characterization of suspensions was implemented to assess the mechanical sensitivity of the bonds and the structural inter-particle resistance to both the chemical effect and mechanical impact. By analyzing the viscosity results and the evolution of the rheological parameters, the improvements needed in terms of the resistance characteristics of the loess-bentonite and loess-lime mixtures were evaluated and confirmed. The loess physical sensitivity was examined through grain-size distribution and plasticity properties. The pH and electrical conductivity of the mixtures were also used to explore structural modifications. Physical test results showed that introduction of the additives changed the loess texture and improved the plasticity of mixtures. Chemical examination (via change in pH and electrical conductivity) revealed the structural changes in the mixtures studied. Rheological test results showed that increasing concentrations of bentonite and lime improves the mechanical strength and increased the yield stress, consistency, and viscosity of the suspensions. The creation of cement interactions between mixture particles explained the increase in those parameters. Hydration, agglomeration, and inter-particle flocculation induced by the additives promoted these interactions. The experimental results led to the conclusion that bentonite and lime may represent an effective means to improve the performance in terms of preventing loess collapse and to increase its resistance to mechanical impact. The results presented in the present study may provide a geotechnical and rheological working database for the control and treatment of loess collapse and landslides in the region under study. Technical data related to loess may, therefore, be beneficial in terms of civil engineering, public works, hydraulics, and the manufacture of construction materials.

show abstract

Properties of the Loess Sediments in Ostrava Region (Czech Republic) and Comparison with Some Other Loess Sediments

Cited by 3 publications

References 19 publications

Geothermal energy in loess

Geothermal energy in loess

Surface runoff on loess: an example of a commonly overlooked hazardous process from northeast Czech Republic

Improvement of Physical-Chemical and Rheological Properties of Ghardaïa Loess (Southern Algeria) Using Bentonite Clay and Lime

Contact Info

Product

Resources

About