| Titre : | The mineralogy of the CaO–Al2O3–SiO2–H2O (CASH) hydroceramic system from 200 to 350 °C (2009) |
| Auteurs : | Nicola Meller, Auteur ; Konstantinos Kyritsis, Auteur ; Christopher Hall, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Cement and concrete research (Vol. 39 N° 1, Janvier 2009) |
| Article en page(s) : | pp. |
| Note générale : | Génie Civil |
| Langues : | Anglais |
| Tags : | Hydration products ; X-ray diffraction ; Oil well cement ; Geothermal cement |
| Résumé : | We describe a quantitative mineralogical study of the hydrothermal reactions of an oil well cement with added silica and alumina, hydrated at temperatures from 200 to 350 °C. We compare the products with pure end member systems and find phase stability can be altered radically, even by small amounts of additive. The upper temperature limits of α-C2SH (< 250 °C), and 1.1 nm tobermorite C5S6H5 (< 300 °C) are increased. C8S5, reported in a cement-based system for the first time, is stable to 300 °C and is believed to prevent foshagite C4S3H formation below 350 °C. Hydrogarnet C3AS3−yH2y is the only aluminum bearing phase at < 300 °C but it coexists with C4A3H3 and bicchulite C8A4Si4H4 at higher temperatures. The presence of alumina increases the stability of 1.1 nm tobermorite greatly and also to a lesser degree of gyrolite. |
| ISSN : | 0008-8846 |
| En ligne : | http://www.sciencedirect.com/science/article/pii/S0008884608001920 |
