ОЦЕНКА ФОТОКАТАЛИТИЧЕСКОЙ АКТИВНОСТИ БЕТОНА

Abstract

Based on the change in the color of an organic dye – rhodamine B, on the surface of concrete under the action of ultraviolet radiation, a theoretical and experimental assessment of the photocatalytic activity of concrete was carried out. Photocatalytic activity was calculated using the obtained coordinates of colorimetry L * a * b *. To assess the performance of the photocatalyst over time, a test was carried out with concrete samples at the age of 7 and 28 days. Titanium dioxide of three types of anatase modification of a foreign manufacturer was used as a photocatalyst in the study. It is shown that the introduction of titanium dioxide into concrete promotes self-cleaning of its surface. The values of discoloration of the dye on the concrete surface were obtained depending on its composition and on the time of exposure to ultraviolet radiation. It was determined that the value of the specific surface area of titanium dioxide affects the photocatalytic activity. It is noted that with the age of concrete samples, there is a noticeable decrease in phototransformation. It was also found that the high specific surface area of titanium dioxide allows it to exhibit its photocatalytic properties over time.