Study of the Suspension Stability of Titanium Dioxide of Anatase Modification for Self-Purifying Fine Concrete

Abstract

The suspension stability of the titanium dioxide of anatase modification, obtained by ultrasonic dispersion (USD) at the ultrasound frequency of 35 kHz in the aqueous medium of the stabilizer for self-purifying fine concrete as a finishing material for building envelope, is studied. The extreme dependence of the zeta potential on the ultrasonic dispersion parameters of titanium dioxide in the aqueous medium of the surfactant on the basis of sodium salts of naphthalene sulfonic acid and formaldehyde condensation products is established. Various variants of the sequence of the surfactant introduction into the titanium dioxide suspension are analysed. The ratio between TiO2 and the stabilizer, at which the zeta potential exceeds the threshold value of 30 mV and the suspension stability is maintained during 15 days, is determined. The optimal sequence of the suspension components introduction and the ultrasonic dispersion time are established. The influence mechanism of intermittent surfactant introduction on stabilization of the suspension of titanium dioxide of anatase modification is offered. The dependences of the fine concrete strength on zeta potential of the studied suspensions are obtained.