SELF-STRENGTHENED GYPSUM COMPOSITIONS BASED ON FLY ASH

This work is devoted to the study of self-reinforced gypsum stone with increased strength properties and low creep due to the reinforcement of the gypsum matrix with filiform ettringite crystals. However, with this method of self-reinforcement, difficulties may arise in providing a sufficient volume of an alkaline medium when using a saturated solution of calcium hydroxide obtained by slaking air calcium lime. The method is simplified by replacing saturated lime solutions with powder mixtures of fly ash captured by electrostatic precipitator systems during combustion of coals from the Kansk-Achinsk brown coal basin at thermal power plants. Gypsum composite based on fly ash has increased strength, which confirms the possibility of effective use of fly ash from the combustion of brown coal in building gypsum composites used to create structural elements of buildings. According to the study of the results of microscopic imaging of the resulting self-reinforced structure, the forming gypsum matrix becomes denser with differently directed crystals and fly ash microspheres included in the work. Utilization of fly ash waste in the composition of reinforced composites allows not only to simplify the method of self-reinforcement, reduce costs, but also to solve the problem of recycling chemically active ash.