Wyniki wyszukiwania - BazTech

1

Determination of the Atterberg Limits of Eemian Gyttja on Samples With Different Composition

Goławska Katarzyna, Lechowicz Zbigniew, Matusiewicz Władysław, Sulewska Maria Jolanta

Studia Geotechnica et Mechanica

|

2020

|

Vol. 42, nr 2

168--178

EN

The paper presents the results of laboratory tests of plastic limit wp and liquid limit wL of Eemian gyttja characterized by different organic matter content Iom and calcium carbonate content CaCO3. Comparison of the liquid limit wL determined with the use of the Casagrande apparatus wLC and a cone penetrometer with cones having apex angles of 60° wL60 and 30° wL30 is shown. Based on statistical analysis of the test results, single- and two-factor empirical relationships for evaluating the plastic limit wP and liquid limit wL of Eemian gyttja depending on the organic matter content Iom and/or calcium carbonate content CaCO3 are presented in this study.

2

The Amounts of Water Adsorbed to the Surface of Clay Minerals at the Plastic Limit

Gorączko A., Olchawa A.

Archives of Hydro-Engineering and Environmental Mechanics

|

2017

|

Vol. 64, nr 3-4

155--162

EN

The paper presents results of a study on the amount of water associated with the solid phase of the clay water system at the plastic limit. Two model monomineral clays, namely kaolinite, and montmorillonite, were used in the study. The latter was obtained by gravitational sedimentation of Na-bentonite (Wyoming). The calculated mean number of water molecule layers on the external surface of montmorillonite was 14.4, and water in interlayer spaces constituted 0.3 of the water mass at the plastic limit. The number of water layers on the external surface of kaolinite particles was 63, which was related to the higher density of the surface electrical charge of kaolinite compared to that of montmorillonite. The calculations were made on the basis of the external surface area of clays and the basal spacing at the plastic limit measured by an X-ray diffraction test. The external surface area of clays was estimated by measuring sorption at a relative humidity p/p0 = 0.5.

3

Ocena możliwości oznaczenia granicy plastyczności metodą penetrometru stożkowego

Jaśkiewicz K., Wszędyrówny-Nast M.

Przegląd Geologiczny

|

2014

|

Vol. 62, nr 10/2

588--593

EN

The plastic limit of soils was first described by Atterberg in 1911. The thread-rolling test became one of the standard tests of soil mechanics. In recent years this method has been the subject of much criticism. This paper reviews the original method of plastic limit determination as proposed by Atterberg and the fall cone methods for determining at the same time both the liquid and the plastic limits of soils. The tests were performed on 748 samples representing a wide range of soil type with different clay content ranging from 4 to 79%.

4

Badania fazy ciekłej dwufazowych modelowych iłów na granicy plastyczności

Olchawa A., Gorączko A., Ziółkowska D.

Przegląd Geologiczny

|

2014

|

Vol. 62, nr 10/2

654--56

EN

The paper presents investigations into the relationship between specific surface area of two monomineralic clays and their plastic limits. Two clays – sodium montmorillonite and calcium kaolinite were used to study. For montmorillonite, the quantity of interlayer water at plastic limit is approximately 30% of water content. The number of the layers of water molecules on the external surface area ne = 13÷14. For kaolinite (i.e. non- -swelling clay minerals which only contain water on external surface area), the number of layers of water molecules on the external surface area ne = 63.

5

Prediction of consistency parameters of fen soils by neural networks

Borowiec A., Wilk K.

Computer Assisted Methods in Engineering and Science

|

2014

|

Vol. 21, no. 1

67--75

EN

Determination of the bearing capacity of subsoil requires knowledge of the soil strength parameters. The standard way to determine the soil parameters is the use of direct research methods. In the case of less responsible buildings designed on a subsoil of simple structure it often seems reasonable to adopt basic soil parameters without performing complex analysis. Frequently, the geotechnical parameters are determined on the basis of correlation between physical and mechanical properties of the soil. This is why, it is necessary to research the relationships between different soil parameters in order to make the soil geotechnical identification faster and cheaper. This is very important for design of new structures, and, above all, it also facilitates verification of the substrate quality during execution of construction work.

6

Wpływ składu chemicznego, wariantowej obróbki cieplnej oraz plastycznej i cieplnej na charakter pękania stopów na osnowie fazy międzymetalicznej Ni3Al

Bojar Z., Zasada D., Jóźwik P.

Biuletyn Wojskowej Akademii Technicznej

|

2002

|

Vol. 51, nr 11

45-58

PL

W pracy przedstawiono wyniki badań fraktograficznych trzech stopów na osnowie fazy międzymetalicznej Ni3Al o różnej zawartości chromu, molibenu i cyrkonu. Stwierdzono, że budowa przełomów uzyskanych w efekcie statycznego rozciągania próbek opisywanych stopów, silnie zależy od składu fazowego i stopnia rozdrobnienia struktury w zakresie kształtowania parametrów wytrzymałościowych, poziomu plastyczności i mechanizmów pękania. Odnotowano między innymi, że w stanie bezpośrednio po odlewaniu lub wygrzewaniu ujednoradniającym (struktury grubokrystaliczne) stopy pękają krucho, tworząc przełomy śródkrystaliczne po przestrzeniach międzydendrytycznych lub śródkrystaliczne łupliwe. Natomiast stopy na osnowie fazy międzymetalicznej odkształcone plastycznie w stanie lanym lub po wcześniejszym wygrzewaniu ujednoradniającym, a następnie rekrystalizowane (materiały drobnoziarniste), charakteryzują się w statycznej próbie rozciągania przełomem makroskopowo ciągliwym śródkrystalicznym, z udziałem pękania łupliwego ograniczonego do wymiarów drobnych ziaren i przy dużym udziale odkształcenia plastycznego po granicach ziaren.

EN

The study results are presented of the influence of chemical composition and structure of alloys with the basis of Ni3Al intermetallic phase with alloy additions of born, zirconium, chromium and molybdenum on the selected mechanical properties. The essential influence was found of chemical composition as well as the structure (post casting state, after homogenization the coarse grain structure and post plastic and thermal treating the small grain structure) on the strength properties of alloys with the basis of Ni3Al phase.