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Refractory concretes based on aluminous cements are used with great success in areas where high temperatures are required. But to have a product with satisfactory properties at high temperatures are required for all components that obtained the concrete to provide a stable behaviour. This paper aims compositional characterization of high-alumina ce...
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... defined peaks of alumina presence from the composition of ordinary super aluminous cements is explained by the fact that usually the one obtained in industrially have the composition corrected by adding alumina, thus explaining the high alumina content obtained by chemical analysis which does not correspond to the place in CaO-Al 2 O 3 binary system. Analyzing the shape and intensity of the peaks corresponding X-ray diffraction spectrum of the experimental super aluminous cements presented in Figures 3 and 4, it can be seen that in the analyzed samples were formed the mineralogical compounds wanted: CA 6 (2.4780Å, 2.6230Å, 2.1090Å) and/ or CA 2 (3.5000, 2.5990Å, 4.4400Å), corresponding to the composite selected from CaO-Al 2 O 3 phase diagram for these cements. Along with these compounds was also found unreacted alumina (2.0650Å, 2.5230Å, 1.5900Å) from the raw mix. ...
