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Preparation of Photocatalytic Decorative Concrete Based on Nano-Titanium Dioxide Adsorbed by Clay Brick from Building Waste and Its Application in Pavement Structure of Railway Freight Yard

In this paper, based on the clay brick of building waste, nano-titanium dioxide photocatalytic decorative concrete was prepared, and its application in the pavement structure of a railway freight yard was studied. The results show that the loading capacity of nano-titanium dioxide on
 clay sand carrier is better than that on zeolite sand. With the increase of powder content, the photocatalytic efficiency of decorative concrete surface decreases, but the degree of reduction is small. Compared with laboratory conditions, the reduction rate of NOX in surface
 layer of decorative concrete under natural curing condition is lower. The photocatalytic efficiency did not decrease significantly at 90 days. Cement cementing could greatly improve the bonding effect of nano-titanium dioxide, which made the photocatalytic activity of decorative concrete surface
 layer have good durability. In this paper, decorative concrete is applied to the pavement engineering of a railway container yard in Liaoning Province. The pavement structure combination design, cement concrete pavement thickness design, pavement panel design and joint design are analyzed.