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

Materials ◽  
2019 ◽  
Vol 12 (14) ◽  
pp. 2220 ◽  
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.

scholarly journals Three-dimensional pore structure visualization and characterization of paper using X-ray computed tomography

TAPPI Journal ◽  
2017 ◽  
Vol 16 (09) ◽  
pp. 519-530 ◽  
Author(s):  
Yves Defrenne ◽  
Vasili Zhdankin ◽  
Sahana Ramanna ◽  
Shri Ramaswamy ◽  
Bandaru Ramarao
Keyword(s):  
Experimental Data ◽  
Computed Tomography ◽  
Pore Structure ◽  
3D Visualization ◽  
Complex Structure ◽  
Three Dimensional ◽  
Structure Characterization ◽  
X Ray ◽  
Pore Size Distributions ◽  
X Ray Computed

Porous biomaterials such as paper and board have a complex structure that influences their mechanical, optical, and transport properties and thereby their performance during manufacturing and end uses. Reconstruction of the three-dimensional (3D) pore spaces in paper was obtained by X-ray computed tomography and used to study the structure and its impact on properties. A set of laboratory-made paper samples of varying freeness was prepared, and the 3D structures of the samples were visualized and characterized. Tomographic reconstruction images were processed using techniques such as anisotropic diffusion, minimum error thresholding, and isolated voxel removal to enhance image quality. The pore structures were analyzed to determine porosity, fiber-pore interfacial surface area, geometric tortuosity, and pore size distributions (using a sphere growing algorithm). These properties were compared with experimental data and were found to be in good agreement. The results from 3D visualization and characterization were then compared with experimental data of various samples using conventional pore structure characterization techniques, such as mercury intrusion porosimetry.

scholarly journals Pore Structure Analysis of Mortar Under Freeze-Thaw Cycles Using X-Ray Computed Tomography

◽  
2016 ◽  
Author(s):  
Katsufumi Hashimoto ◽  
◽  
Hiroshi Yokota ◽  
Takafumi Sugiyama ◽  
◽  
...  
Keyword(s):  
Computed Tomography ◽  
Pore Structure ◽  
Structure Analysis ◽  
X Ray ◽  
Freeze Thaw ◽  
X Ray Computed ◽  
Pore Structure Analysis

scholarly journals Pore structure characterization of oak via X-ray computed tomography

BioResources ◽  
2020 ◽  
Vol 15 (2) ◽  
pp. 3053-3063
Author(s):  
Liangyan Guo ◽  
Hongchao Cheng ◽  
Junfeng Chen ◽  
Wentao Chen ◽  
Jingyao Zhao
Keyword(s):  
Computed Tomography ◽  
Pore Structure ◽  
Pore Size ◽  
Three Dimensional ◽  
Structure Characterization ◽  
X Ray ◽  
Volume Porosity ◽  
Pore Area ◽  
X Ray Computed ◽  
Area And Volume

The microscopic pore structure of wood is an important factor that affects its macroscopic properties. In this study, an oak sample was used for pore structure characterization. X-ray computed tomography imaging was carried out, and the scanning results (a multi-layer two-dimensional planar image) were rendered using Avizo software (a three-dimensional stereo image). A digital image processing method was used to identify the characteristics of the three-dimensional pore structure features and to calculate the characteristic parameters, i.e., the porosity (volume/surface), pore area and volume, pore size distribution, and the connectivity. The 27 mm3 oak sample had the following characteristics: a pore size which ranged from 8.56 µm to 1262.84 µm; a pore volume of 1.01 × 1010 µm3; a pore area and volume porosity of 1.12 × 109 µm2 and 37.6%, respectively; a surface porosity range of approximately 36.1% to 39.1%; a pore diameter for axial connection ranging from approximately 164.57 µm to 1262.84 µm; and had corresponding proportions of the pore area and volume of approximately 74.4% and 67.3%, respectively. This information provided useful structural data for the construction of future models.

3-D Analysis of Pore Structure of Porous Biomaterials Using Micro Focus X-Ray Computed Tomography

2006 ◽  
pp. 1095-1098
Author(s):  
Mitsuru Takemoto ◽  
Shunsuke Fujibayashi ◽  
B. Otsuki ◽  
Tomiharu Matsushita ◽  
Tadashi Kokubo ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Pore Structure ◽  
X Ray ◽  
X Ray Computed ◽  
Porous Biomaterials
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