MATHEMATICAL MODELING AND METHODS OF SELECTION OF POROUS CEMENT CONCRETE COMPOSITION

Abstract

Introduction. The construction and operation of airfield elements such as runways, taxiways, and parking places that meet the requirements of regulations and modern methods of road works are significant in the system of aviation security in modern conditions. In order to ensure safe conditions for landing aircraft on the runway during downpours and heavy rains, porous cement concrete should be used as the surface source, which will further reduce hydroplaning. Research problem. Due to a large number of aircraft crashes and their rolling outside the runway, which is associated with the frequent failure of the coating to perform drainage because of unfavorable weather conditions (including thunderstorms, showers, and snowfalls), there is the need to improve the existing structures of airfield pavements or to develop new technologies to improve the drainage of pavement and, accordingly, the safety of takeoff and landing of aircraft on the runway. The use of modern airfield pavement structures made of porous cement concrete with drainage properties is one of the ways to solve this problem. The purpose of the study. The research aims to prove that the use of porous cement concrete in mathematical modeling of porous cement concrete composition and improvement of airfield structure will guarantee safe conditions for takeoff and landing and taxiing of aircraft on the runway. Materials and methods. During the research, the analysis of monographs, normative documentation, methodical instructions and recommendations was made. These documents establish requirements concerning the selection of materials for porous cement concrete structure, its use in the construction of elements of an airfield, and their exploitation. Results. The feasibility of using different methods of design and selection of the design and selection of porous cement concrete is proved. Conclusion. The revision and analysis of the literature showed that in order to obtain products and structures with specified properties the most appropriate approach is the use of several methods simultaneously to project and select components for the composition of porous cement concrete. The benefits of the simultaneous use of several methods such as the reduction of information processing time, the improvement of mixture quality, the flexibility of the model to adjustment, the simplification of analysis, and the comparison of indicators of mathematical modeling and laboratory tests were highlighted.

Keywords

• mixsture quality
• flexibility