Resumo

MORALES RENDON, JUAN GUILLERMO  e  RESTREPO BAENA, OSCAR JAIME. STABILIZATION OF ULTRAMARINE BLUE PIGMENT IN WHITE PORTLAND CEMENT. Dyna rev.fac.nac.minas [online]. 2008, vol.75, n.155, pp.171-180. ISSN 0012-7353.

Samples of blue cement were prepared from white Portland cement type III, according to Colombian Standards (CS) and ultramarine blue pigment U-601 like admixture in 2% in weight of cement. Cement was chemistry tested by fluorescence of X-ray, and physical properties according to CS. Pigment and cement were tested in chromatic parameters by spectrophotometer through CIELAB system. Some additives and admixtures were selected (among organic, inorganic and mineral) to be added to the blue cement in a ranging of weight of cement. Samples of blue cement without additives but also those samples with different dosages of additives in the selected range were tested in physical and chromatic properties for different ages (1, 3, 7 and 28 days) when specimens were immersed in water saturated with lime. Additional to this, chromatic properties to some specimens at the laboratory conditions were tested at the same ages of time. Blue color completely disappeared with all organic additives and partially disappeared in some inorganic additives and mineral admixtures. Setting time, compressive strength and others characteristic of cement were affected, in some cases positive and in others negative, like effect of the different quantities of additives and admixtures added to the blue cement.

Palavras-chave : White Portland cement; ultramarine blue pigment; chromatic properties; admixtures.

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