Three-dimensional quantification of pore structure in coal ash-based geopolymer using conventional electron tomography SCIE SCOPUS

Cited 22 time in WEB OF SCIENCE Cited 25 time in Scopus
Title
Three-dimensional quantification of pore structure in coal ash-based geopolymer using conventional electron tomography
Author(s)
Lee, Sujeong; Jou, Hyeong-Tae; van Riessen, Arie; Rickard, William D. A.; Chon, Chul-Min; Kang, Nam-Hee
KIOST Author(s)
Jou, Hyeong Tae(주형태)
Publication Year
2014-02-15
Abstract
X-ray tomography, mercury intrusion porosimetry, and gas adsorption are used to characterize the nano-scale pore structure of geopolymers with little success. This is because X-ray tomography still lacks high resolution for nanometer-sized pores and the other techniques use the incorrect assumptions of regular pore geometry and interconnected pore systems. To reveal the three-dimensional structure of nanometer-sized pores in coal ash-based geopolymer, conventional bright field electron tomography is used in this study for the first time. Because artifacts resulting from diffraction effects of newly-formed zeolite-like phases are introduced only in the matrix surrounding the pores, the pore size distribution has been investigated successfully. Most of the pores had irregular geometry and were found to range from 20 to 60 nm in equivalent perimeter diameter. The porosity was determined to be 7.15% for the volume of interest, 0.00748 mu m(3). The first successful outcome of the reported experiment indicates that electron tomography will play an important role in the future for measuring the porosity and pore connectivity of geopolymers enabling predictions of durability and optimization of material properties. (C) 2013 The Authors. Published by Elsevier Ltd. All rights reserved.
ISSN
0950-0618
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/2863
DOI
10.1016/j.conbuildmat.2013.10.072
Bibliographic Citation
CONSTRUCTION AND BUILDING MATERIALS, v.52, pp.221 - 226, 2014
Publisher
ELSEVIER SCI LTD
Subject
CEMENT-BASED MATERIALS; X-RAY MICROTOMOGRAPHY; FLY-ASH; MECHANICAL-PROPERTIES; MATERIALS SCIENCE; NANOMETER-SCALE; IMAGE-ANALYSIS; MICROSTRUCTURE; MICROSCOPY; CONCRETE
Keywords
Geopolymer; Electron tomography; Porosity; Pore connectivity
Type
Article
Language
English
Document Type
Article
Publisher
ELSEVIER SCI LTD
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