ABSTRACT
When performing works on restoration of historical plaster stucco, repairs and reconstruction of sculptures and products of small architectural forms, fast-hardening gypsum binders with high strength characteristics and good adhesion are required. The low water resistance of conventional gypsum materials is due to the relatively high solubility of calcium sulfate di-hydrate, and the crystal structure of gypsum is characterized by loose packing of crystals and high porosity. A promising direction in the field of creating gypsum materials and products with improved physical, mechanical and operational characteristics is the production of gypsum binders with micro-and nano-additives of energetically active particles that strengthen the intercrystalline bonds of gypsum stone. This work is devoted to the research of gypsum materials modified with a dilute emulsion of synthetic latex and nanosized carbon particles. The influence of modifying additives on the characteristics of high-strength gypsum was studied. It is shown that the simultaneous introduction of two modifiers – latex and carbon nanoparticles-significantly change the crystal structure and morphology of the cured gypsum stone. This changes the shape and size of individual crystals and increases the surface area of contacts between crystals, changes the density of their packaging and the nature of porosity, which explains the improvement in the characteristics of gypsum.
