Production of Fly Ash Aerated Concrete and Efficiency of Its Application

The literature sources on the production and energy efficiency of non-autoclaved aerated concrete application are analyzed. The efficiency of use in the composition of aerated concrete as a filler of fly ash and light microsphere (cenosphere) is compared. It is shown that at the same content of source materials the use of fly ash as a filler allows us to obtain aerated concrete with an average density of 969 kg/m³ and a strength of 3.5 MPa. Substituting the fly ash in aerated concrete composition makes it possible to reduce its average density to 440 kg/m³ with a strength of 1.14 MPa. The pore structure of the aerated concrete samples is investigated. The complex estimation of the efficiency using the developed fly ash aerated concrete in the construction of the enclosing structures of residential buildings is made. The efficiency is evaluated taking into account the costs (including the energy component) at different stages of the life cycle of the building: production, construction, operation. Selection of individual elements and the optimal design of the external enclosure of the building, based on the proposed indicator of the cost of unit saving energy, and with account of the cost of construction and installation works and operational characteristics of individual elements, is performed.