Mouna A. In the strength of the connection of increase concrete elements using developed epoxypolymers in Libya.

The dissertation is devoted to creation of epoxyamine composites of construction purpose with high heat resistance, improved technological, adhesion-strength and physico-mechanical properties, resistant to the influence of climatic factors and aggressive environments of climatic zone of Libya, on the basis of epoxygidomers cured by a combined binary amine hardener. Object of study. Processes of influence of external factors and composition of epoxidian compositions on the adhesive strength of concrete elements of structures used in the climatic zone of Libya. The aim of the study. Increasing the bond strength of concrete elements using the developed epoxy compounds, as well as improving the protection of concrete structures from the aggressive environment of the climate zone of Libya. Research Methods. Experimental studies were performed using experimental design methods. Physico-mechanical studies were carried out in accordance with the standard standard methods for determining the strength and water absorption of building materials and products. The viscosity of the compositions was measured by a rotary method. Research by the method of estimation of viability for the formation of polymer filaments at the time of gelation; by the method of estimation of the degree of curing of epoxy formulations by the content of gel fraction. Rheological studies of epoxy formulations. To evaluate the adhesion of epoxy formulations to different substrates, a uniform separation method was used. The study of the stability of samples that have been restored by the developed epoxypolymers, under the influence of climatic factors and aggressive media in terms of weight loss. Methods of mathematical processing of research results. The novelty of the work is that it is determined that the regularities of the directional control of technological properties of filled epoxy polymer compositions at elevated temperatures up to 1000C. The possibility of creating epoxypolymers with less intense, homogeneous dilatant structure by the joint use of diabase filler, mixed hardener and surfactants has been established. The regularities of regulation of rheological properties, processes of curing of structure, chemical stability of epoxy compositions with aerosil filler were revealed, which allowed to develop thixotropic corrosion-resistant epoxy mastic for protection of concrete and reinforced concrete structures.The influence of elevated temperatures and thermal shock on adhesive strength and fracture stress on bending at temperatures up to 1000C has been investigated. In the temperature range from 50C to 1000C the adhesive strength exceeds the concrete tensile strength, and the increase in flexural strength was 10-15%. Practical results. Based on the developed compositions compositions with high heat resistance, adhesion, chemical and atmospheric resistance were obtained, which can be used as protective coatings for the protection and restoration of concrete objects in the climate zone of Libya. Developed warehouses allow to increase by 15-30% the load-bearing capacity of the renewable object, with a lifetime of up to 10 years, the economic effect of the implementation of the obtained results is $ 250 per 100 m2 of coverage.