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The aim of the research presented in this paper is to evaluate the feasibility of using hydrophobic agents based on organosilicon compounds for surface protection of lightweight concrete modified with waste polystyrene. The experimental part pertains to the physical and mechanical properties of polystyrene-modified lightweight concrete. The concrete samples were prepared with the following ingredients CEM I 42.5 R cement, recycled polystyrene (0-2 mm), quartz sand (0-2 mm), coarse river aggregate (2-16 mm), and water. Silane and tetrame
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