Authors:
J. Dweck Escola de Química da Universidade Federal do Rio de Janeiro Depto. de Processos Inorgânicos Bloco E do CT Sala E-206, Cidade Universitária Rio de Janeiro RJ Brasil 21949-900 Bloco E do CT Sala E-206, Cidade Universitária Rio de Janeiro RJ Brasil 21949-900

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P. Ferreira da Silva Escola de Química da Universidade Federal do Rio de Janeiro Depto. de Processos Inorgânicos Bloco E do CT Sala E-206, Cidade Universitária Rio de Janeiro RJ Brasil 21949-900 Bloco E do CT Sala E-206, Cidade Universitária Rio de Janeiro RJ Brasil 21949-900

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P. Büchler Química da Escola Politécnica da Universidade de Săo Paulo Depto. de Engenharia Săo Paulo Brasil Săo Paulo Brasil

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F. Cartledge Louisiana State University Chemistry Department Baton Rouge LA 70803 USA Baton Rouge LA 70803 USA

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Abstract  

Thermogravimetry (TG) and derivative thermogravimetry (DTG) have been used by the authors as very effective tools to study hydration steps of cements used for solidification/stabilization of tanning wastes. The present paper presents a method which was applied to separate the peaks shown by DTG curves of type II Portland cement pastes, analyzed at different times during the first 4 weeks of setting. Through a specific software a more detailed study of the evolution of the cement hydration may be done, which allows the measurement of the amount of hydrated water present in tobermorite gel as well as in ettringite, which are the main phases formed from the original components of the cement. The number of moles of water present in the ettringite phase calculated by the method is in very good agreement with the values found in the literature, validating the method to calculate the same parameter in tobermorite gel. In the latter case the water content decreases significantly during the first day of hydration, then remains at a constant value over the rest of the analyzed period.

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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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