Fluoroanhydrite Compositions Modified with Autoclaved Aerated Concrete Production Waste

The paper presents a study on the physical and technical characteristics of fluoroanhydrite compositions modified with a mineral additive based on aerated concrete production waste. Testing of samples showed that the introduction of 4% aerated concrete leads to an increase in the compressive strength of the samples by 57%, while the softening coefficient increases to 1.12. Modern methods of physical and chemical analysis have proven that the improvement in performance is associated with the formation of amorphous hydration products based on calcium silicate hydrates. Studies using scanning electron microscopy in combination with energy dispersive analysis confirmed the compaction of the structure by amorphous new formations. IR spectral and differential thermal analysis were used to study the mineralogy of hydration products, which contributed to an increase in the density, strength and water resistance of the fluoroanhydrite composition modified with finely ground waste from the production of autoclaved aerated concrete.