Kroviakov S. Experimental and theoretical basis for improving the durability of lightweight concretes for thin-walled hydraulic structures

The object of the research – the structure and the properties of modified light concretes and fiber-concretes on porous fillers for thin-walled constructions of hydraulic structures; the methods – the physical and mechanical characteristics of concretes and mixtures were determined in accordance with the current normative documents with the authorized equipment. Optimal planning of the experiments with the use of multifactorial mathematical modeling, microscopic and X-ray diffraction analysis of the structure, the analysis of technological damage of composites and the digital analysis of color range of decorative concretes are used; the results –the theoretical foundations were developed and the practical methods for increasing the durability of concrete on porous aggregates for thin-walled hydrotechnical structures, in particular reinforced concrete floating were created. The use of porous filler processing, aimed at improving its action in the cement-sand matrix, is proposed. The methods for increasing the durability of lightweight concrete due to their complex modification and disperse reinforcement were improved; novelty – the theoretical foundations of durability increasing of light concrete on porous fillers for thin-walled structures have been developed; the mechanism of structure change of light concretes during the operation in the structures of thin-walled hydrotechnical structures was revealed; the possibility of improving the mechanical properties and durability of light concrete due to hydrophobic treatment of the surface of porous gravel has been proved; the positive influence of technological processing of porous fillers with a cement slurry on their work in the cement-sand matrix was proved; the effectiveness of disperse reinforcement application for concretes with different types of porous fillers was found; introduced – in the educational process of Odesa State Academy of Civil Engineering and Architecture, to the project of State Standard of Ukraine “Shipbuilding concrete. Technical conditions and manufacturing technology”, as well as in practice of construction organizations: Kherson State Plant "Pallada", Ltd "Cambio", Scientific and Production Center "Ecostroy".