Preparation of coatings for moisture migration control of cementitious materials under low-vacuum environment

Moisture dispersion restricts the long-term use of cementitious materials in vacuum pipeline beams. This study designs a fire-new coating merging organic (silica sol-modified polyacrylate) with inorganic surface modifiers (water glass). The coating on the mortar surface can mitigate its mass loss, with the coating composed of polyacrylate, silica sol, and water glass (in a mass ratio of 72:18:10) being the most promising improvement. This interpenetrating organic-inorganic network structure penetrates into mortar and reacts with hydration products to produce new substances and more dense structure. These findings provide valuable insights into enhancing the durability of cementitious materials under low-vacuum conditions.