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

doi:10.24425/agp.2019.126442

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Tytuł artykułu

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

Autorzy

Wójcik Emilia , Trzciński Jerzy , Łądkiewicz-Krochmal Katarzyna

Treść / Zawartość

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DOI

10.24425/agp.2019.126442

Warianty tytułu

Języki publikacji

Abstrakty

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.

Słowa kluczowe

clay pastes quantitative image analysis pore space soil-water curve

pasty gliniane analiza ilościowa obrazów rozkład porów gleba woda

Wydawca

Faculty of Geology of the University of Warsaw
Komitet Nauk Geologicznych PAN

Czasopismo

Acta Geologica Polonica

Rocznik

2019

Tom

Vol. 69, no. 3

Strony

465--488

Opis fizyczny

Bibliogr. 91 poz., rys., tab., wykr.

Twórcy

autor

Wójcik Emilia

wojcike@uw.edu.pl

Faculty of Geology, University of Warsaw, Żwirki i Wigury 93, PL-02-089 Warszawa, Poland

autor

Trzciński Jerzy

jerzy.trzcinski@uw.edu.pl

Wroclaw Research Centre EIT+, Stabłowicka 147, PL-54-066 Wrocław, Poland

autor

Łądkiewicz-Krochmal Katarzyna

katarzyna_ladkiewicz@wp.pl

Faculty of Geology, University of Warsaw, Żwirki i Wigury 93, PL-02-089 Warszawa, Poland

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Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).

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