Water suspension of mixtures of CaO, and quartz (CaO/SiO o = 1,2; 1,6 and 2,0) in which I0-50 wt % CaO were substituted by dolomite, were hydrothermally treated at 20O°C. X-ray phase analysis of reaction products showed that chiefly scawtite and partly calcium-and magnesium silicate hydrates were fo
Formation of scawtite from mixtures of CaO, magnesite and quartz under hydrothermal conditions
✍ Scribed by L. Števula; J. Petrovič
- Publisher
- Elsevier Science
- Year
- 1981
- Tongue
- English
- Weight
- 499 KB
- Volume
- 11
- Category
- Article
- ISSN
- 0008-8846
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✦ Synopsis
The phase composition of samples prepared under hydrothermal conditions at 200°C from a suspension of mixtures of CaO, quartz and magnesite has been studied. When I0, 20, 30 and 50 wt % of CaO were substituted by magnesite, the mole ratio CaO/SiO 2 being 0,83 and 1,20 -chiefly tober~w)rite, gyrolite and calcite or scawtite and tobermorite were formed, and the strength of the tested materials was observed to decrease.
Die Phasenzusammensetzung der aus der Wassersuspension der Gemengen CaO, Quarz und Magnesit unter hydrothermalen Bedingungen bei 200°C hergestellten Proben wurden untersucht. Es wurde festgestellt, dass durch den Ersatz yon I0, 20, 30 und 50 Gewichtsprozent CaO mit Magnesit bei einem Molverh~Itnis CaO/SiO 2 = 0,83 resp. 1,20 -hauptsEchlich Tobermorit, Gyrolit und Kalzit resp. Scawtit und Tobermorit entstehen, wobei das gepr~fte Material an Festigkeit verliert.
📜 SIMILAR VOLUMES
Hydrothermal studies showed the location of scawtite in the narrow internal tetrahedron foshagite-xonotlite-CO2-H20 of the system CaO-SiO2-C02-H20 and its compatibility with the calcium silicate hydrates in the 4-phase assemblages. The phase assemblages in this region involve scawtite, foshagite, xo