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A platform for research: civil engineering, architecture and urbanism
The formation, stability and microstructure of calcium sulphoaluminate hydrates present in hydrated cement pastes, using in sito synchrotron energy-dispersive diffraction
Synchrotron radiation-energy dispersive diffraction (SR-EDD) has been used for the first time to study the formation and the stability of the calcium sulphoaluminate hydrates in hydrated Portland cement pastes. The SR-EDD technique has been shown to be capable of not only monitoring the overall content of the ettringite (AFt) phase in cement pastes, but also more detailed microstructural and compositional charateristics. The most signifcant differences in the characteristics of the AFt phase are those between this phase forming in pastes prepared from the typical C3A-containing ordinary Portland cements, compared to the ferrite containing srpc. There appear to be differences in the morphology of the AFt crystals at all ages, and at later ages (>273 d) probable compositional changes within the phase formed in opc pastes, as compared to the apparently compositionally more stable analogue present in the high ferrite cement pastes. The technique is also capable of monitoring the monosulphate (AFm) phase, although probably not the actual content, due to the disorganized nature of this phase in the cement paste system. The peak intensity was found to increase with increasing hydration time; no significant differences were observed between the four cements.
The formation, stability and microstructure of calcium sulphoaluminate hydrates present in hydrated cement pastes, using in sito synchrotron energy-dispersive diffraction
Synchrotron radiation-energy dispersive diffraction (SR-EDD) has been used for the first time to study the formation and the stability of the calcium sulphoaluminate hydrates in hydrated Portland cement pastes. The SR-EDD technique has been shown to be capable of not only monitoring the overall content of the ettringite (AFt) phase in cement pastes, but also more detailed microstructural and compositional charateristics. The most signifcant differences in the characteristics of the AFt phase are those between this phase forming in pastes prepared from the typical C3A-containing ordinary Portland cements, compared to the ferrite containing srpc. There appear to be differences in the morphology of the AFt crystals at all ages, and at later ages (>273 d) probable compositional changes within the phase formed in opc pastes, as compared to the apparently compositionally more stable analogue present in the high ferrite cement pastes. The technique is also capable of monitoring the monosulphate (AFm) phase, although probably not the actual content, due to the disorganized nature of this phase in the cement paste system. The peak intensity was found to increase with increasing hydration time; no significant differences were observed between the four cements.
The formation, stability and microstructure of calcium sulphoaluminate hydrates present in hydrated cement pastes, using in sito synchrotron energy-dispersive diffraction
Die Bildung, Stabilität und Mikrostruktur von Calciumsulfoaluminat-Hydraten, die in hydratisierten Zementpasten vorhanden sind; Anwendung einer In-situ-Synchrotronstrahlungs-energiedispersiven Beugungsmethode
Henderson, E. (author) / Turrillas, X. (author) / Barnes, P. (author)
Journal of Materials Science ; 30 ; 3856-3862
1995
7 Seiten, 4 Bilder, 4 Tabellen, 29 Quellen
Article (Journal)
English
| British Library Online Contents | 1994
Water diffusion and microstructure of hydrated cement pastes
| Springer Verlag | 1972