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Calcium aluminates
About: Calcium aluminates is a research topic. Over the lifetime, 490 publications have been published within this topic receiving 9200 citations.
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TL;DR: In this article, the reactivity of two metakaolins, which vary principally in their surface area, and Portland cements of varying composition were examined via isothermal calorimetry for pastes at water-to-cementitious materials ratio of 0.50 containing 8% cement replacement by weight of metakaolin.
129 citations
TL;DR: In this paper, the micro-and nanostructure of the composites have been analyzed by X-ray diffraction, scanning electron microscopy and high-resolution transmission-empowered microscopy as affected by the type of CaL conditions employed.
122 citations
10 Apr 2012-Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science
TL;DR: In this paper, the authors studied the transient evolution of spinels in laboratory and industrial heats and found that spinels can be modified readily to liquid inclusions by a calcium treatment, which is a well-established way to modify solid alumina inclusions to liquid or partially liquid calcium aluminates.
Abstract: Calcium treatment is a well-established way to modify solid alumina inclusions to liquid or partially liquid calcium aluminates. Spinels (Al2O3·xMgO) can also form in liquid steel after aluminum deoxidation. Like alumina, the spinels can be modified readily to liquid inclusions by a calcium treatment. The modification of spinels was studied by observing the transient evolution of inclusions, in laboratory and industrial heats. Spinel modification involves the preferential reduction of MgO from the spinel, with Mg dissolving in the steel, and it proceeds through transient calcium sulfide formation, just like in the case of alumina inclusions. Because magnesium dissolves in steel after the calcium treatment of spinels, the reoxidation of the melt will produce new spinels.
121 citations
TL;DR: In this article, Raman spectroscopy has been used to follow the hydration of the main calcium aluminate phases present in CAC and calcium sulfoaluminate cement (CSA) clinkers.
115 citations
TL;DR: In this paper, the influence of processing method and firing temperature on calcium hexaluminate grain morphology was studied and a significant correlation was found between grain morphology and green density, porosity distribution and presence of agglomerates.
Abstract: Calcium hexaluminate (CA6) was prepared from alumina and calcium carbonate powders. The influence of processing method and firing temperature on calcium hexaluminate grain morphology was studied. A significant correlation was found between grain morphology and green density, porosity distribution and presence of agglomerates. Platelet grains were observed for low green densities and large pores, while more equiaxed grains were found when green density was increased. A model is proposed for the formation of equiaxed or platelet grains. The model is based on the number of contact areas between alumina and calcium carbonate grains in green specimens as well as on the free space available for calcium hexaluminate to grow.
111 citations