Microstructure Characterization by Means of X-ray Micro-CT and Nanoindentation Measurements

Rajczakowska, Magdalena; Stefaniuk, Damian; Łydżba, Dariusz

doi:10.1515/sgem-2015-0009

Cited by 18 publications

(7 citation statements)

References 15 publications

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“…[13], [26]. XμCT possibilities of microstructure analysis of composite material were presented in [11]. Furthermore, grey value images generated by the XμCT technique can serve as a basis for finite element models and following numerical simulations of, e.g., compression ([19], [32]).…”

Section: Microtomography Overexposurementioning

confidence: 99%

Preliminary Investigations of Creep Strain of Neogene Clay from Warsaw in Drained Triaxial Tests Assisted by Computed Microtomography

Kaczmarek

Dobak

Kiełbasiński

2017

Studia Geotechnica Et Mechanica

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Abstract:The study concerns soil creep deformation in multistage triaxial stress tests under drained conditions. High resolution X-ray computed microtomography (XμCT) was involved in structure recognition before and after triaxial tests. Undisturbed Neogene clay samples, which are widespread in central Poland, were used in this study. XμCT was used to identify representative sample series and informed the detection and rejection of unreliable ones. Maximum deviatoric stress for in situ stress confining condition was equal 95.1 kPa. This result helped in the design of further multistage investigations. The study identified the rheological strain course, which can be broken down into three characterizations: decreasing creep strain rate, transitional constant creep velocity, and accelerating creep deformation. The study found that due to multistage creep loading, the samples were strengthened. Furthermore, there is a visibly "brittle" character of failure, which may be the consequence of the microstructure transformation as a function of time as well as collapse of voids. Due to the glacial tectonic history of the analyzed samples, the reactivation of microcracks might also serve as an explanation. The number of the various sizes of shear planes after failure is confirmed by XμCT overexposure.

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Section: Microtomography Overexposurementioning

confidence: 99%

Preliminary Investigations of Creep Strain of Neogene Clay from Warsaw in Drained Triaxial Tests Assisted by Computed Microtomography

Kaczmarek

Dobak

Kiełbasiński

2017

Studia Geotechnica Et Mechanica

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“…In addition, the mathematical reconstruction process is necessary to obtain cross-sections of the sample. 33 5.2. Nanoindentation technique.…”

Section: Micro-structural Analysesmentioning

confidence: 99%

Synthesis and microstructural properties of the scaffold based on a 3-(trimethoxysilyl)propyl methacrylate–POSS hybrid towards potential tissue engineering applications

et al. 2016

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“…The non-destructive technique of micro-computed tomography (µCT) was used to characterise pore space variation. The adopted approach was similar to those presented in [37,38,39,40]. The sample was trimmed to a rectangular prism whose dimensions ensured the analytical resolution of 10 µm/pix.…”

Section: Analysis Of Distribution Of Pores Across Wallmentioning

confidence: 99%

Application of Nanoindentation and 2D and 3D Imaging to Characterise Selected Features of the Internal Microstructure of Spun Concrete

2019

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The spinning of concrete is a process in which concrete mixture is moulded and compacted under the action of the centrifugal force arising during the fast rotational motion of the mould around its longitudinal axis. As a result of the spinning of the liquid concrete mixture, an element annular in cross section, characterised by an inhomogeneous layered wall structure, is produced. The heavier constituents tend towards the cross-section wall’s outer side, while the lighter components tend towards its inner side. The way in which the particular constituents are distributed in the element’s cross section is of key importance for the macro properties of the manufactured product. This paper presents procedures for investigating spun concrete and interpreting the results of such investigations, which make it possible to characterise the microstructure of the concrete. Three investigative methods were used to assess the distribution of the constituents in the cross section of the element: micro-computed tomography (µCT), 2D imaging (using an optical scanner) and nanoindentation. A procedure for interpreting and analysing the results is proposed. The procedure enables one to quantitatively characterise the following features of the microstructure of spun concrete: the mechanical parameters of the mortar, the aggregate content, the pore content, the cement paste content, the aggregate grading and the size (dimensions) of the pores. Special attention is devoted to the determination of the variation of the analysed quantities in the cross section of the element. The result of the application of the investigative procedures is presented for an exemplary spun concrete element. The proposed procedures constitute a valuable tool for evaluating the process of manufacturing spun concrete elements.

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Microstructure Characterization by Means of X-ray Micro-CT and Nanoindentation Measurements

Cited by 18 publications

References 15 publications

Preliminary Investigations of Creep Strain of Neogene Clay from Warsaw in Drained Triaxial Tests Assisted by Computed Microtomography

Preliminary Investigations of Creep Strain of Neogene Clay from Warsaw in Drained Triaxial Tests Assisted by Computed Microtomography

Synthesis and microstructural properties of the scaffold based on a 3-(trimethoxysilyl)propyl methacrylate–POSS hybrid towards potential tissue engineering applications

Application of Nanoindentation and 2D and 3D Imaging to Characterise Selected Features of the Internal Microstructure of Spun Concrete

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