3D Monte Carlo simulation of backscattered electron signal variation across pore-solid boundaries in cement-based materials

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Title: 3D Monte Carlo simulation of backscattered electron signal variation across pore-solid boundaries in cement-based materials
Author(s): Yio, MHN
Wong, HS
Buenfeld, NR
Item Type: Journal Article
Abstract: Three-dimensional (3D) Monte Carlo simulation was used to study the variation of backscattered electron (BSE) signal across pore-solid boundaries in cement-based materials in order to enhance quantitative analysis of pore structure. The effects of pore size, depth and boundary inclination angle were investigated. It is found that pores down to 1 nm can generate sufficient contrast to be detected. Visibility improves with larger pore size, smaller beam probe size and lower acceleration voltage. However, pixels in shallow pores or near pore boundaries display higher grey values (brightness) than expected due to sampling sub-surface or neighbouring solid material. Thus, cement-based materials may appear less porous or the pores appear smaller than they actually are in BSE images. Simulated BSE images were used to test the accuracy of the Overflow pore segmentation method. Results show the method is generally valid and gives low errors for pores that are 1 μm and greater.
Publication Date: 16-Sep-2016
Date of Acceptance: 9-Sep-2016
URI: http://hdl.handle.net/10044/1/40005
DOI: https://dx.doi.org/10.1016/j.cemconres.2016.09.008
ISSN: 0008-8846
Publisher: Elsevier
Start Page: 320
End Page: 331
Journal / Book Title: Cement and Concrete Research
Volume: 89
Copyright Statement: © 2016, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/K030760/1
Keywords: Building & Construction
0905 Civil Engineering
1202 Building
Publication Status: Published
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering



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