Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 84: Issue 1
Simultaneous IR/TG study of calcium carbonate in two aged cement pastes
Author:
Ewa Stepkowska Institute of Hydro-Engineering PAS Gdansk Poland 80–953 Gdansk Poland 80–953

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Pages:
175–180
Online Publication Date:
14 Apr 2006
Publication Date:
14 Apr 2006
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-005-7179-5
Keywords:
calcium carbonate hydrates; calcium carbonate hydroxide hydrates; calcium carbonates; cement hydration and ageing; IR spectroscopy; TG/DTG/DTA; water in hydrated cement
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Abstract  

Two aged cement pastes (7 years) were studied for H2O and CO2 evolution, the combined amounts of which were measured by TG and identified by thermo-IR analysis. This indicated the presence of three forms of carbonates, which decomposed at different temperatures. The displacement with time of the evaporation of sorbed water to higher temperatures (500–700C, TG, MS) shows the possibility of its incorporation into carbonate hydrates and/or hydroxy hydrates, postulated previously. The decomposition of all the hydration products needed a thermal energy increasing with ageing (increased temperature measured by TG). The carbonation process proceeded for 7 years in the weaker paste, whereas it terminated before 5 years in the stronger one. The CSH water content did not change with ageing, whereas that of portlandite was lowered, which though did not account for the increase in carbonate content (TG). Possibly some Ca2+ from the CSH gel was involved in this process. In the stronger paste the growth with time of organic matter was found (IR, TG/DTG).

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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