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Journal of Materials Science
Published in: Journal of Materials Science 10/2015

01-05-2015 | Original Paper

Effects of incorporating nanosilica on carbonation of cement paste

Authors: Seungmin Lim, Paramita Mondal

Published in: Journal of Materials Science | Issue 10/2015

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Abstract

An accelerated carbonation test (at 5 % CO2, 22 °C and 55 % RH) was carried out on bulk and powdered cement paste samples incorporating two different supplementary cementitious materials: microsilica and nanosilica. Extensive characterization using thermogravimetric analysis, scanning electron microscopy with X-ray microanalysis, and image analysis was performed at various degrees of carbonation, to study the fundamental effects of nanosilica on carbonation of main hydration products, calcium hydroxide (CH) and calcium silicate hydrate (C–S–H). Results at every stage were compared with the effects of microsilica addition to cement paste. Results suggested that incorporation of small amounts of micro or nanosilica can decrease the total carbonation of cement paste. In particular, nanosilica could reduce carbonation (decalcification) of C–S–H and the depth of carbonation significantly.
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Metadata
Title
Effects of incorporating nanosilica on carbonation of cement paste
Authors
Seungmin Lim
Paramita Mondal
Publication date
01-05-2015
Publisher
Springer US
Published in
Journal of Materials Science / Issue 10/2015
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-015-8910-7

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