An in situ synchrotron energy-dispersive diffraction study of the hydration of oilwell cement systems under high temperature/autoclave conditions up to 130 deg. C

Journal Article · Thu Dec 15 00:00:00 EST 2005 · Cement and Concrete Research

DOI:https://doi.org/10.1016/J.CEMCONRES.2004.0· OSTI ID:20793255

Colston, Sally L ^[1]; Barnes, Paul ^[1]; Jupe, Andrew C ^[1]; Jacques, Simon D.M. ^[1]; Hall, Christopher ^[2]; Livesey, Paul ^[3]; Dransfield, John ^[4]; Meller, Nicola ^[2]; Maitland, Geoffrey C ^[5]

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1. Industrial Materials Group, Department of Crystallography, Birkbeck College, London WC1E 7HX (United Kingdom)
2. Centre for Materials Science and Engineering and School of Engineering and Electronics, University of Edinburgh, King's Building, Edinburgh EH9 3JL (United Kingdom)
3. Castle Cement Ribblesdale Ltd., Clitheroe, Lancashire BB7 4QF (United Kingdom)
4. 38a Tilehouse Green Lane, Knowle, West Midlands B93 9EY (United Kingdom)
5. Schlumberger Cambridge Research Ltd., High Cross, Madingley Road, Cambridge CB3 0EL (United Kingdom)

The technique of synchrotron energy dispersive diffraction has been developed for in situ studies of cement hydration under autoclave conditions. This has been applied to oilwell cements hydrating at typical oilwell temperatures up to 130 deg. C. The results show clearly the detailed interplay between 11 detectable phases, from which a phase transformation scheme has been derived; this illustrates the progression of hydration up to 130 deg. C for two extreme cases, with and without conservation of water content and autoclave pressure. The monosulphate hydrate phases are found to exhibit different stability bounds, with a surprising sequence of the 14-water, 10-water then 12-water monosulphate as temperature/time increases; the latter form is particularly associated with conditions of water/pressure loss. The effect of retarders on C{sub 3}S dissolution and CH formation is negligible above 70 deg. C, whereas the effect on the calcium sulphoaluminate hydrates is more complex, and possible reasons for this are discussed.

• OSTI ID: 20793255
• Journal Information: Cement and Concrete Research, Vol. 35, Issue 12; Other Information: DOI: 10.1016/j.cemconres.2004.09.005; PII: S0008-8846(04)00414-4; Copyright (c) 2004 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0008-8846
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINATES
AUTOCLAVES
CEMENTS
DISSOLUTION
HYDRATES
HYDRATION
PHASE TRANSFORMATIONS
STABILITY
TEMPERATURE RANGE 0400-1000 K
X-RAY DIFFRACTION