Materials Science Forum Vol. 1170

Abstract: The article investigates the influence of ultraviolet (UV) on polyurethane foams' structural and mechanical characteristics. To assess the impact of changes and degradation of foam properties, studies were conducted for two groups of samples: those without exposure to UV and those exposed to natural UV for 3 months. According to the analysis of IR spectra, insignificant chemical changes in the structure of the outer surface of the samples were established as a result of three months of UV influence on the foam. No noticeable chemical changes were found in the inner part of such samples. Compression tests of samples of different groups were carried out under static loading to study the change in mechanical characteristics. Based on experimental tests, changes in the values of mechanical, strength, and deformation characteristics were investigated: Young's modulus, elastic strength, yield strength, and degree of deformation recovery. A conclusion was made about the resistance of polyurethane foam to ultraviolet influence for a period of up to three months.

Abstract: The purpose of this article is to address the problem of designing durable, durable and economically efficient road clothing. The article examines the practical use of geosynthetic materials for reinforcing asphalt concrete pavements during the construction of highways.

Abstract: The processes of structure formation in hardening disperse systems are considered from the standpoint of synergetics and catastrophe theory.It is proposed to use a topological approach to identify general patterns of behavior of such systems, based on the possibility of modeling the transition of smooth quantitative changes into radical qualitative ones. Based on the analysis of literary data, a group of curves of the structure formation kinetics is identified, the extreme form of which reproduces the geometry of the simplest catastrophe «fold».Spatial models describing the kinetics of dispersion hardening are constructed and analyzed. It is shown that the agreement between the experimental and model kinetic curves is expressed not only in the external similarity of the nature of the dependencies, but also in their logical generalization.It is noted that the canonical «fold» model can also be effectively applied in the study of anomalousrheological behavior of dispersed systems.