Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Investigation of hydration and pozzolanic reaction in reactive powder concrete (RPC) using 29.Si NMR
Hydration of RPC (Reactive Powder Concrete) and pozzolanic reaction were studied by 29.Si NMR using SPE/MAS technique. Industrial cement and materials (silica fume, crushed quartz) constitutive of RPC imposed a careful study of spectra Acquisition (relaxation times, spinning velocity). Two RPC formulations were tested. Samples having undergone heat treatment at temperatures between 20 deg C and 250 deg C were investigated in order to gain a better understanding of the influence of temperature on hydration and pozzolanic activity. It was shown that silica fume consumption was highly dependent on heat treatment temperature and duration. Crushed quartz reactivity was also clearly demonstrated. It was proved to be dependent on heat treatment temperature and duration. Q3 peaks attributed to the presence of a crystal hydrate, xonotlite were identified at 250 deg C. Microstructural changes in hydrates structure were also observed. Average CaO-SiO2-H2O chain length was shown to increase with increasing heat treatment temperature.
Investigation of hydration and pozzolanic reaction in reactive powder concrete (RPC) using 29.Si NMR
Hydration of RPC (Reactive Powder Concrete) and pozzolanic reaction were studied by 29.Si NMR using SPE/MAS technique. Industrial cement and materials (silica fume, crushed quartz) constitutive of RPC imposed a careful study of spectra Acquisition (relaxation times, spinning velocity). Two RPC formulations were tested. Samples having undergone heat treatment at temperatures between 20 deg C and 250 deg C were investigated in order to gain a better understanding of the influence of temperature on hydration and pozzolanic activity. It was shown that silica fume consumption was highly dependent on heat treatment temperature and duration. Crushed quartz reactivity was also clearly demonstrated. It was proved to be dependent on heat treatment temperature and duration. Q3 peaks attributed to the presence of a crystal hydrate, xonotlite were identified at 250 deg C. Microstructural changes in hydrates structure were also observed. Average CaO-SiO2-H2O chain length was shown to increase with increasing heat treatment temperature.
Investigation of hydration and pozzolanic reaction in reactive powder concrete (RPC) using 29.Si NMR
Untersuchungen der Hydratisierung und puzzolanischen Reaktionen in Betonen aus reaktivem Pulvermaterial (RPC) mittels 29.Si magnetischer Kernresonanz
Zanni, H. (Autor:in) / Cheyrezy, M. (Autor:in) / Maret, V. (Autor:in) / Philippot, S. (Autor:in) / Nieto, P. (Autor:in)
Cement and Concrete Research ; 26 ; 93-100
1996
8 Seiten, 4 Bilder, 3 Tabellen, 16 Quellen
Aufsatz (Zeitschrift)
Englisch
Investigation of Hydration and Pozzolanic Reaction in Reactive Powder Concrete (RPC) Using 29Si NMR
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