Multi-scale characteristics of coal structure by x-ray computed tomography (x-ray CT), scanning electron microscope (SEM) and mercury intrusion porosimetry (MIP)

Microstructural properties have been studied in cementitious materials, which were subjected to cyclic sulfate exposure, through x-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and mercury intrusion porosimetry (MIP). Results indicate that portlandite in OPC concrete and OPC-FA concrete is mainly converted to gypsum. Portlandite in OPC-GBFS concrete is mainly converted to gypsum and ettringite. Concrete subjected to the cyclic sulfate attack has a lower porosity and the higher amount of macro-pores than that before exposure. Concretes incorporating FA or GBFS had lower porosity and higher amount of micro-pores than OPC concrete.

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Use of Imaging Techniques for Viewing the Internal Structure of Rubberised Asphalt Mixtures

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.695.8 ◽

2014 ◽

Vol 695 ◽

pp. 8-11 ◽

Cited By ~ 1

Author(s):

Norhidayah Abdul Hassan ◽

Gordon Airey ◽

Ramadhansyah Putra Jaya ◽

Mohd Zul Hanif Mahmud ◽

Nordiana Mashros

Keyword(s):

Computed Tomography ◽

Electron Microscope ◽

Internal Structure ◽

Imaging Techniques ◽

Asphalt Mixture ◽

Asphalt Mixtures ◽

X Ray ◽

X Ray Computed ◽

Rubberized Asphalt Mixture ◽

Scanning Electron

This paper presents the application of different imaging techniques for viewing the internal structure of rubberized asphalt mixture as road materials. Two imaging techniques were used to capture the internal structure images of its compacted samples i.e. X-ray Computed Tomography (non-destructive method) and Scanning Electron Microscope, SEM (destructive method). Since a lot of previous researchers have produced extensive works on the mechanical properties, therefore, this study is an attempt to introduce the microstructure of rubberized asphalt mixtures produced using dry process method. Two types of dry mixed rubberized asphalt mixture were prepared by modifying a Hot Rolled Asphalt Mixture (HRA 60/20) with different crumb rubber sizes. A mixture of conventional HRA 60/20 was also scanned for comparison. The illustrations are aimed to provide the researchers more information regarding their internal structure distribution.Keywords: Imaging techniques, X-ray Computed Tomography, Scanning Electron Microscope, Rubberised Asphalt Mixture

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Characterizing soil pore structure using nitrogen adsorption, mercury intrusion porosimetry, and synchrotron-radiation-based X-ray computed microtomography techniques

Journal of Soils and Sediments ◽

10.1007/s11368-014-0995-0 ◽

2014 ◽

Vol 15 (2) ◽

pp. 302-312 ◽

Cited By ~ 27

Author(s):

Yutong Zong ◽

Xiuling Yu ◽

Minxiang Zhu ◽

Shenggao Lu

Keyword(s):

Synchrotron Radiation ◽

Pore Structure ◽

Mercury Intrusion Porosimetry ◽

Nitrogen Adsorption ◽

X Ray ◽

Mercury Intrusion ◽

Computed Microtomography ◽

X Ray Computed

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Automatic Knot Detection in Coarse-Resolution Cone-Beam Computed Tomography Images of Softwood Logs

Forest Products Journal ◽

10.13073/fpj-d-19-00008 ◽

2019 ◽

Vol 69 (3) ◽

pp. 185-187

Author(s):

Magnus Fredriksson ◽

Julie Cool ◽

Stavros Avramidis

Keyword(s):

Computed Tomography ◽

Exploratory Study ◽

Ct Scanning ◽

Detection Algorithm ◽

Cone Beam ◽

X Ray ◽

Coarse Resolution ◽

Computed Tomography Images ◽

X Ray Computed ◽

Accurate Position

Abstract X-ray computed tomography (CT) scanning of sawmill logs is associated with costly and complex machines. An alternative scanning solution was developed, but its data have not been evaluated regarding detection of internal features. In this exploratory study, a knot detection algorithm was applied to images of four logs to evaluate its performance in terms of knot position and size. The results were a detection rate of 67 percent, accurate position, and inaccurate size. Although the sample size was small, it was concluded that automatic knot detection in coarse resolution CT images of softwoods is feasible, albeit for knots of sufficient size.

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Multi-scale X-ray computed tomography to detect and localize metal-based nanomaterials in lung tissues of in vivo exposed mice

Scientific Reports ◽

10.1038/s41598-018-21862-4 ◽

2018 ◽

Vol 8 (1) ◽

Cited By ~ 7

Author(s):

Perrine Chaurand ◽

Wei Liu ◽

Daniel Borschneck ◽

Clément Levard ◽

Mélanie Auffan ◽

...

Keyword(s):

Computed Tomography ◽

X Ray ◽

Multi Scale ◽

X Ray Computed

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Pore Structure Damages in Cement-Based Materials by Mercury Intrusion: A Non-Destructive Assessment by X-Ray Computed Tomography

Materials ◽

10.3390/ma12142220 ◽

2019 ◽

Vol 12 (14) ◽

pp. 2220 ◽

Cited By ~ 8

Author(s):

Xiaohu Wang ◽

Yu Peng ◽

Jiyang Wang ◽

Qiang Zeng

Keyword(s):

Computed Tomography ◽

Pore Structure ◽

High Mass ◽

X Ray ◽

Quantitative Evidence ◽

Mercury Intrusion ◽

Pore Size Distributions ◽

Cement Based Materials ◽

Before And After ◽

X Ray Computed

Mercury intrusion porosimetry (MIP) is questioned for possibly damaging the micro structure of cement-based materials (CBMs), but this theme still has a lack of quantitative evidence. By using X-ray computed tomography (XCT), this study reported an experimental investigation on probing the pore structure damages in paste and mortar samples after a standard MIP test. XCT scans were performed on the samples before and after mercury intrusion. Because of its very high mass attenuation coefficient, mercury can greatly enhance the contrast of XCT images, paving a path to probe the same pores with and without mercury fillings. The paste and mortar showed the different MIP pore size distributions but similar intrusion processes. A grey value inverse for the pores and material skeletons before and after MIP was found. With the features of excellent data reliability and robustness verified by a threshold analysis, the XCT results characterized the surface structure of voids, and diagnosed the pore structure damages in terms of pore volume and size of the paste and mortar samples. The findings of this study deepen the understandings in pore structure damages in CBMs by mercury intrusion, and provide methodological insights in the microstructure characterization of CBMs by XCT.

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Microstructural characterization of biobased carbon foam by means of X-ray microtomography and compared to conventional techniques

RSC Advances ◽

10.1039/c6ra16969d ◽

2016 ◽

Vol 6 (98) ◽

pp. 96057-96064 ◽

Cited By ~ 3

Author(s):

Juliette Merle ◽

Pascale Sénéchal ◽

Fabrice Guerton ◽

Peter Moonen ◽

Pierre Trinsoutrot ◽

...

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Mercury Intrusion Porosimetry ◽

Microstructural Characterization ◽

Carbon Foam ◽

X Ray ◽

Mercury Intrusion ◽

Scanning Electron

The objective of this work is to compare three techniques for characterizing the morphology of porous bio-based carbon foam, namely mercury intrusion porosimetry, scanning electron microscopy and X-ray microtomography.

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