Wyniki wyszukiwania - BazTech

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Fajans ze starożytnego Egiptu – pierwsza w dziejach ludzkości ceramika typu high-tech – tajemnice technologii produkcji

Trzciński Jerzy, Zaremba Małgorzata, Nachyła Olga

Szkło i Ceramika

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2021

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R. 72, nr 3

17--22

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Wpływ zanieczyszczenia olejem napędowym na uziarnienie i plastyczność mad z rejonu Warszawa-Siekierki

Izdebska-Mucha Dorota, Trzciński Jerzy, Klein Marta

Przegląd Geologiczny

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2021

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Vol. 69, nr 12

800-810

EN

The paper presents the results of testing flood facies sediments - muds. The term “‘muds” refers to a genetic type of deposits, regardless of their variability in particle size composition and organic matter content. Due to the poor geological engineering properties, such as, high lithological variability, low degree of diagenesis, as well as high moisture content and organic matter content, muds are classified as weak soils and river valleys are the areas of complicated ground conditions. The paper presents lithological, physical and chemical properties of muds from the floodplain of the Vistula River valley in the area of Warsaw-Siekierki. A series of mud samples contaminated with diesel fuel in the range of 2-16%wereprepared. The microaggregate analyses as well as the plastic and liquid limit tests showed a significant effect of contamination on the soil index properties. The increase in diesel fuel content resulted in the loss of soil plasticity and cohesion. The aggregation of clay particles and the increase in the silt fraction content was observed. The most significant changes of properties were obtained for the mud samples containing 6-16% of diesel fuel. The research of soils contaminated with petroleum products is of great importance in determining the geological engineering conditions of the subsoil for foundation purposes.

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Microstructural changes of expansive clays during dehydration caused by suction pressure - a case study of Miocene to Pliocene clays from Warsaw (Poland)

Wójcik Emilia, Trzciński Jerzy, Łądkiewicz-Krochmal Katarzyna

Acta Geologica Polonica

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2019

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Vol. 69, no. 3

465--488

EN

This paper presents the qualitative and quantitative characteristics of microstructures of Neogene clays from Warsaw, Poland. Scanning Electron Microscope (SEM) studies were used for the microstructural analysis of natural clays and clay pastes. Qualitative microstructural changes were observed: from a honeycomb microstructure for the initial clay paste to a turbulent microstructure for the dried paste. It was also noticed that water loss caused by the increase of the suction pressure had a significant impact on the microstructural transformations. Significant changes in the quantitative values of the pore space parameters were also observed. Increase of suction pressure and water loss caused a decrease in porosity and changes in the values of morphometric parameters, such as pore distribution; for example, a significant increase of the number of pores of 0−10 μm size and changes in the geometric parameters of the pore space were noticed with the increase of suction pressure. The pore space with larger isometric pores was modified into a pore space with the dominance of small anisometric and fissure-like pores. The increased degree of anisotropy from a poorly-oriented to a highly-oriented microstructure was also observed. After rapid shrinkage the reduction in the number of pores, maximum pore diameter, and total pore perimeter was recorded. The process of rapid water loss induced the closure of very small pores. A similar effect was observed during the increase of the suction pressure, where the closure of pore space of the clay pastes was observed very clearly.

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Zmiany mikrostrukturalne gliny lodowcowej spowodowane zanieczyszczeniem olejem napędowym

Izdebska-Mucha Dorota, Trzciński Jerzy

Geologos

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2007

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Vol. 11

463--472

PL

W artykule przedstawiono analizę zmian mikrostruktury gliny lodowcowej zanieczyszczonej in situ olejem napędowym. Badania zostały wykonane z zastosowaniem skaningowego mikroskopu elektronowego oraz programu komputerowego STIMAN do ilościowej analizy zdjęć mikroskopowych. Wstępne wyniki badań dowiodły, że mikrostruktura gliny uległa wyraźnym zmianom na skutek zanieczyszczenia olejem napędowym. Stwierdzono wzrost porowatości, liczby mezoporów, średnich i maksymalnych wartości obwodu, powierzchni i średnicy porów. Mikrostruktura gliny zanieczyszczonej stała się bardziej izotropowa, na co wskazuje spadek wartości wskaźnika anizotropii mikrostruktury i liczby porów szczelinowatych oraz wzrost średniej wartości współczynnika formy porów. Zaobserwowane zmiany są wynikiem redukcji sił wzajemnego oddziaływania pomiędzy cząstkami ilastymi po zanieczyszczeniu gruntu cieczą o niskiej wartości stałej dielektrycznej.

EN

In this study the effects of petroleum pollution on microstructure of glacial till were investigated. Undisturbed samples of the unaltered soil and the soil contaminated in situ by diesel oil were tested using skanning electron microscope. Quantitative analysis of microscopic photographs was conducted using STIMAN software. Results obtained show that the microstructure of the contaminated till changed significantly. The analysis revealed increase in such micromorphological parameters as: total porosity, number of mezopores, pore diameter, pore area and pore perimeter. The microstructure converted to more isotropic, which was supported by decrease in coefficient of anisotropy and number of fissure pores. Variations in the soil microstructure were attributed to diminution of repulsive interparticle forces due to low dielectric constant of diesel oil.