RATIONAL TECNOLOGY OF WATERPROOFING SYSTEM OF REINFORCED CONCRETE SLABS OF BRIDGE SPAN STRUCTURES

Abstract

In the paper have been considered modern design options of arranging waterproofing coatings for the carriageway and sidewalk parts of girder bridge structures with a monolithic reinforced concrete overlay slab to ensure its impermeability and durability. Have been conducted a comprehensive analysis of the advantages and disadvantages of waterproofing technologies and materials currently available on the Ukrainian market based on our own practical experience, as well as on the research of well-known domestic and foreign scientist. Have been considered the problems and risks associated with damage to protective isolation layers, which ultimately results in significant costs for major repairs of the supporting structures of bridge spans. Among the many alternative options, the most rational option of multilayer insulation was selected according to the integral cost criterion, which occurred in the settings of the waterproofing membrane, obtained by deep impregnation of the surface layers of concrete with siloxane or methyl methacrylate polymers, covering them with a waterproofing layer with the formation, after hardening of the waterproofing components, of a concrete-polymer high-strength, wear-resistant and impermeable layer, which reliably adheres to the asphalt pavement of the roadway due to an additional adhesion layer.

Have been considered conducting scientific research, structural and technological issues of installing a waterproofing membrane, among which the preparation of the concrete surface for applying impregnating isolation materials (primer layer) and the localization and elimination of initial defects of the solid base should be especially highlighted. Have been considered the design aspects related to the organization of a continuous insulating layer, together with the isolation of the pavement part of the span structure and the issue of adhesion of the layers of the base-isolation-road surface system. Have been proven that the structural integrity of waterproofing is the key to its high durability. The work emphasizes the importance of organizing end-to-end quality control of isolation work at all production stages, which ensures a long planned warranty period of operation of the moisture-proof span structure.

The offered structural isolation solution have been implemented in the conditions of a real construction site during the overhaul of the spans of the bridge structure in the city of Gaisyn across the Sib River at km 484+370 of the national highway M-12 Stryi-Ternopil-Kropyvnytskyi-Znamyanka on the roadway and sidewalk parts using Eliminator technology, developed by the British company Stirling Lloyd. Theoretical studies of the durability of waterproofing works have been confirmed by many years of trouble-free operation of the hydromembrane under conditions of active operation