Monitoring of kinetics of Pozzolanic reaction

0470777 - ÚMCH 2018 RIV CH eng C - Konferenční příspěvek (zahraniční konf.)
Čáchová, M. - Scheinherrová, L. - Kobera, Libor - Urbanová, Martina - Brus, Jiří - Keppert, M.
Monitoring of kinetics of Pozzolanic reaction.
Key Engineering Materials. Vol. 722. Pfaffikon: Trans Tech Publications Ltd, 2017 - (Reiterman, P.), s. 126-131. ISBN 978-303571079-3. ISSN 1013-9826.
[International Conference on Special Concrete and Composite /13./. Skalsky Dvur (CZ), 13.10.2016-14.10.2016]
Grant CEP: GA ČR(CZ) GA16-13778S
Institucionální podpora: RVO:61389013
Klíčová slova: Pozzolanic reaction * chemical kinetics * reaction mechanism
Obor OECD: Civil engineering

The pozzolanic additions are widely used as concrete component for numerous technical, economic and environmental reasons. Obviously the hydration process in a pozzolana containing system differs from hydration of Ordinary Portland Cement (OPC) what is indicated macroscopically by slower increase of strength and lower hydration heat. This paper aims to study pozzolanic reaction from perspective of chemical kinetics. From this point of view pozzolanic reaction and carbonation are two parallel reactions which are competing for portlandite (Ca(OH)2). The rate of each of these two reactions is characterized by rate constant and order of reaction. The system under study was 1:1 mixture lime – ceramic powder. The course of reaction was primarily studied by thermogravimetry which results were further subjected to kinetic analysis. MAS NMR spectroscopy was used for study of structural changes taking place in material in the course of pozzolanic reaction.
Trvalý link: http://hdl.handle.net/11104/0270655