Abstract
White Portland cement is successfully used for the construction of architectural structures and decoration of building facades, and also serves as the main component of many dry building mixtures used for interior decoration. In this study, the effect of highly dispersed powder AEROXIDE TiO2 P25 with a specific surface area of 50 m2/g on the composition, structure and properties of hydrated white Portland cement was investigated. Two types of white cements differing in mineralogical composition were used in the work. It is shown that the rate of for-mation of hydration products, established by X-ray phase analysis, the amount of formed portlandite and the degree of hydration, with the introduction of highly dispersed powder of titanium dioxide increases and reaches 88-90%, which is 3-5% more than in control samples without addition. It was found that the presence of TiO2 in the composition of the set cement influences the microstructure of cement stone: the distribution of crystalline hydrates becomes more uniform, and their size decreases from 10-35 microns to 8-22 microns. The presence of titanium dioxide in the composition of cements gives them the effect of self-cleaning, as a result of which after 4 hours of surface treatment with UV radiation it is cleaned from external contaminant by 67-80%. The optimum amount of titanium dioxide in white cements can be con-sidered as 1 %, which provides comparable strength characteristics with non-supplemented compositions.
Published Version
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