Preparation and Application of Fluorine Doped Calcium Silicate Hydrate

In this paper, the fluorinated modification of calcium silicate hydrate (F-CSH), prepared by hydrothermal process, is reported. The prepared F-CSH was well characterized by nuclear magnetic resonance (NMR) and nitrogen (N2) adsorption studies. The detailed analysis revealed that the fluorine (F) exists in the prepared material in two forms, i.e., attached to the surface of F-CSH as CaF2, and/or connected to Ca2+ in the interlayers of C–S–H. Moreover, the properties of moisture resistance and carbonation resistance are improved in F-CSH compared to pure CSH. This research is of great significance on the application of various fluorine-doped inorganic compounds.