Keywords
Abstract
The article is devoted to the study of the potential of using ash from thermal power plants (TPP) as a partial replacement for the main raw material in the manufacture of hyper-pressed bricks. The relevance of the work is due to the need to develop environmentally and economically feasible approaches to the disposal of large-scale industrial waste, such as waste ash from thermal power plants, while simultaneously creating building materials with improved characteristics. In the course of the study, a number of samples of hyper–pressed bricks with different concentrations of TPP ash were produced and analyzed - up to 40% by weight of binder. To evaluate the effectiveness of the replacement and determine the optimal composition, tests were carried out to determine the physical and mechanical properties of the obtained products, in particular, compressive strength. It has been found that the optimal composition of hyper-pressed bricks with the addition of TPP ash makes it possible to obtain products with a strength grade (≥M150) comparable to the requirements for traditional building bricks. The most effective use of ash as a filler is achieved when its concentration is up to 40% by weight of the binder component. IR spectrometry and SEM analysis methods have been successfully applied to confirm chemical and structural changes in the material. The results of IR spectrometry clearly showed a decrease in the intensity of the peak of calcium hydroxide (Ca(OH)2) and the shift of the silicate gel peak (C-S-H) over time.