Surface application of photocatalyst in cement-based materials could endow it with photocatalytic properties, however, the weak adhesion between photocatalyst coatings and the substrates may result in poor durability in outdoor environments.In this study, TiO2@SiO2 core-shell nanocomposites with Baby Tee different coating thicknesses were synthesized by varying the experiment parameters.The results indicate that SiO2 coatings accelerated the rhodamine B removal to a certain extent, owing to its high surface area; however, more SiO2 coatings decreased its photocatalytic efficiencies.The cement matrix treated with TiO2@SiO2 core-shell nanocomposites showed good photocatalytic efficiency and durability after harsh weathering processing.A reaction mechanism was revealed by the reaction of TiO2@SiO2 nanocomposites Magnesium with Ca(OH)2.