RESTORATION THE FUNCTIONING OF ENGINEERING NETWORKS WITH REINFORCED CONCRETE STRUCTURES DAMAGED DURING SHELLING

Abstract

engineering networks, which in the current conditions of war in Ukraine are exposed to shelling from various types and calibers of conventional weapons. These include pumping stations, boiler houses, and other reinforced concrete structures of water supply, sewerage and heat supply systems. Rapid and efficient restoration of these facilities is crucial for maintaining the functioning of engineering networks. Given the limited time and resources for new construction during wartime, priority is given to reconstruction and repair based on the results of technical inspections of damage. Restoration efforts first focus on the load-bearing reinforced concrete elements, such as columns and beams, with one of the urgent measures being their strengthening. Based on an analysis of methods and technologies for reinforcing reinforced concrete structures, the use of wet shotcreting with high-strength concrete is proposed. Shotcreting continues to evolve, including its application in 3D printing of reinforced concrete structures, and offers advantages such as the absence of formwork (which accelerates concreting), the availability of concrete, and the excellent protective properties of reinforced concrete under shelling, including high strength, rigidity, and resistance to high temperatures, fragment impacts and air shock waves. Using the example of strengthening load-bearing reinforced concrete columns, improvements to wet shotcreting technology through preliminary mechanoactivation of the binder (ordinary Portland cement + 10% microsilica + 1% SNF = 1%) have been introduced, allowing for the creation of high-strength protection (class C32/40...C70/85). This creates additional opportunities for mechanization, automation of wet shotcreting of reinforced concrete structures of engineering networks.