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Title: The impact of carbonation on bulk and ITZ porosity in microconcrete materials with fly ash replacement

Abstract

Scanning electron microscopy was used to evaluate the porosity patterns found in microconcrete materials to better understand the gaseous diffusion pathways and reaction of CO{sub 2} within the bulk cement paste and interfacial transition zone (ITZ) of microconcrete materials containing different fly ash replacement types. Image segmentation was applied to evaluate the porosity as a function of distance from an exposed surface in the bulk cement paste and from aggregate boundaries in the ITZ in both carbonated and non-carbonated microconcrete materials. The ITZ region remained more porous compared to the bulk cement paste for all microconcrete types after carbonation despite a change in the porosity profile across the ITZ region. Results indicate that both the carbonation reaction capacity and porosity before carbonation impact the decrease in porosity observed as a result of carbonation in the ITZ and bulk cement paste regions.

Authors:
;
Publication Date:
OSTI Identifier:
22806450
Resource Type:
Journal Article
Journal Name:
Cement and Concrete Research
Additional Journal Information:
Journal Volume: 103; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0008-8846
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CARBON DIOXIDE; CARBONIZATION; CEMENTS; FLY ASH; GASEOUS DIFFUSION; IMAGES; MICROSTRUCTURE; POROSITY; POROUS MATERIALS; SCANNING ELECTRON MICROSCOPY

Citation Formats

Branch, J. L., Epps, R., and Kosson, D.S., E-mail: david.kosson@vanderbilt.edu. The impact of carbonation on bulk and ITZ porosity in microconcrete materials with fly ash replacement. United States: N. p., 2018. Web. doi:10.1016/J.CEMCONRES.2017.10.012.
Branch, J. L., Epps, R., & Kosson, D.S., E-mail: david.kosson@vanderbilt.edu. The impact of carbonation on bulk and ITZ porosity in microconcrete materials with fly ash replacement. United States. doi:10.1016/J.CEMCONRES.2017.10.012.
Branch, J. L., Epps, R., and Kosson, D.S., E-mail: david.kosson@vanderbilt.edu. Mon . "The impact of carbonation on bulk and ITZ porosity in microconcrete materials with fly ash replacement". United States. doi:10.1016/J.CEMCONRES.2017.10.012.
@article{osti_22806450,
title = {The impact of carbonation on bulk and ITZ porosity in microconcrete materials with fly ash replacement},
author = {Branch, J. L. and Epps, R. and Kosson, D.S., E-mail: david.kosson@vanderbilt.edu},
abstractNote = {Scanning electron microscopy was used to evaluate the porosity patterns found in microconcrete materials to better understand the gaseous diffusion pathways and reaction of CO{sub 2} within the bulk cement paste and interfacial transition zone (ITZ) of microconcrete materials containing different fly ash replacement types. Image segmentation was applied to evaluate the porosity as a function of distance from an exposed surface in the bulk cement paste and from aggregate boundaries in the ITZ in both carbonated and non-carbonated microconcrete materials. The ITZ region remained more porous compared to the bulk cement paste for all microconcrete types after carbonation despite a change in the porosity profile across the ITZ region. Results indicate that both the carbonation reaction capacity and porosity before carbonation impact the decrease in porosity observed as a result of carbonation in the ITZ and bulk cement paste regions.},
doi = {10.1016/J.CEMCONRES.2017.10.012},
journal = {Cement and Concrete Research},
issn = {0008-8846},
number = ,
volume = 103,
place = {United States},
year = {2018},
month = {1}
}