### Purpose, Objectives, Scientific Novelty, and Practical Significance of the Study  
The study aims to search for theoretical and applied solutions in terms of developing the composition and justification of the recipe-technological choice of such a composition of geopolymer concrete for agricultural buildings and structures operating in aggressive environments, with increased corrosion resistance and durability.  
The objectives of the study follow:  
* Interpretation of existing theoretical concepts and applied experience in terms of the development, application, and operation of geopolymer concrete for agricultural purposes;
* Identification of scientific and practical deficits in research of this kind;
* Development of a program of experimental research and writing a plan for fundamental theoretical studies of structure formation and correlation of properties of geopolymer concrete;
* Processing the results, formulating conclusions, building the obtained dependencies, deriving mathematical models in the form of formulas, graphs, and diagrams to obtain new knowledge about the properties and structure of durable concrete on a geopolymer basis for the agricultural complex. The scientific novelty of the work is as follows:
* New interpretations of theoretical knowledge will be obtained, and theoretical and applied ideas about the composition, structure, properties, and operation of geopolymer concrete structures for agricultural purposes will be developed;
* Dependencies between the structure and properties of such concrete were determined and established, and an assessment was made using physical and chemical processes in the formation of the quality and operation of these concrete and structures made of them in aggressive environments. The practical significance of the study lies in the following:
* Obtaining new recommendations for the operation of geopolymer concrete structures with increased reliability, durability, and corrosion resistance in the agricultural complex;
* Obtaining new compositions and recipe-technological recommendations for engineers, technologists, and researchers involved in the development of knowledge and ideas about geopolymer concrete;
* Application of the acquired knowledge and ideas in the real agriculture sector to ensure sustainable development following the goals set by the global framework and UN requirements.  
According to the data presented in Figure 2, it can be seen that the main size distribution range of the studied fly ash particles is within 2-200 microns. The main peak falls at 45 \(\upmu\)m, and the predominant part of the grains (more than 75%) is located in the range from 6 to 35 \(\upmu\)m.  
X-ray phase analysis of fly ash particles is shown in Figure 3.  
According to XRD data, microspheres are represented by a mixture of Al\({}_{6}\)Si\({}_{2}\)O\({}_{13}\) mullite phases and an amorphous X-ray phase, which is referred to as a glass phase, while the mullite phase is the main one.  
Sodium hydroxide (NaOH) produced by PJSC \"Khimprom\" (Novocheboksarsk, Russia), potassium hydroxide (KOH) produced by Soda-Chlorate (Bereznik, Russia), and water glass (Na\({}_{2}\)SiO\({}_{3}\)) produced by JSC Kubanzheldormash (Armavir, Russia) were used as alkaline activators. Characteristics of the alkaline activators used in work are presented in Table 4,Table 5 and Table 6.