SCHEDULED MAINTENANCE
Studies of model macroscopic-defect-free materials. Part 1.—Investigations of the system 4CaO · Al2O3· Fe2O3–4CaO · 3Al2O3· SO3–hpmc–H2O by X-ray, thermoanalytical and NMR techniques
Abstract
Model macroscopic-defect-free (MDF) materials representing selected compositions in the system 4CaO · Al2O3· Fe2O3–4CaO · 3Al2O3· SO3–hpmc–H2O have been prepared, with a variety of water-to-solid ratios and reactions quenched at varying times. Product mixtures were examined by analytical X-ray powder diffraction, thermal analyses and 27Al MAS NMR spectroscopy. Inhibition of crystallisation of hydrated products and elevated temperatures for thermal transformations of those products occur in materials prepared under MDF processing conditions, which incorporate organopolymer (hpmc, hydroxypropylmethylcellulose) into an amorphous hydrated product. Al–O–C crosslinks can be invoked to explain the 27Al spectra, and also the elevation in temperatures of thermal events.
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