Hydrothermal synthesis of cement phases: An in situ synchrotron, energy dispersive diffraction study of reaction kinetics and mechanisms

S. Shaw*, C. M B Henderson, S. M. Clark

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The equipment and methodology for in situ study of hydrothermal reactions using synchrotron radiation are described. This equipment is currently used at the Synchrotron Radiation Source, Daresbury Laboratory, UK, at temperatures up to about 230°C. To demonstrate the utility of this approach three experiments are described: crystallization of Fe- and Cr- doped tobermorite starting compositions to produce mixed tobermorite/xonotlite end products; crystallization of gyrolite and pectolite from a starting gel of gyrolite composition reacted with NaOH solution; and formation of the hydrogarnet, katoite, from a mixture of portlandite, amorphous alumina and amorphous silica. Kinetic analyses using the Avrami equation are reported for each system and used to calculate rate constants and deduce reaction mechanisms. Higher synchrotron X-ray energies (up to 200 keV) would allow thicker walled pressure vessels to be used, with a consequent increase in temperature to supercritical conditions, perhaps to above 400°C.

Original languageEnglish
Pages (from-to)311-324
Number of pages14
JournalHigh Pressure Research
Volume20
Issue number1-6
Publication statusPublished - 2001
Externally publishedYes

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