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Information × Registration Number 0226U000987, (0124U001128) , R & D reports Title Development of resource-efficient concrete mixtures and concretes based on recycled concrete structures popup.stage_title Дослідження експлуатаційних властивостей бетонів на основі рециркульованих бетонних конструкцій і споруд Head Kovalchuk Oleksandr Yu., Кандидат технічних наук Registration Date 19-01-2026 Organization Kyiv National University of Construction and Architecture popup.description1 The purpose of the work is the development of concrete mixes and concretes based on them with a low-defect macrostructure under the condition of using recycled aggregates. popup.description2 The issue of the presence of organic compounds, unburned carbon particles, wood, and other contaminants in the structure of recycled aggregate, which are characteristic of waste from the destruction of reinforced concrete structures formed as a result of hostilities, definitely needs to be addressed. It was for this purpose that a study was conducted to determine the effect of organic compounds, namely sawdust, on the physical and mechanical characteristics of alkali-activated concretes made using recycled aggregates. The use of hybrid alkali cements is effective for general construction and special-purpose materials, namely in the manufacture of concrete mixtures and concretes based on them with an increased risk of structural loosening due to the increased content of organic residues and combustion products. Materials based on them are capable of withstanding significant swelling-shrinkage deformations caused by the presence of combustion products and organic residues. This allows us to predict the effectiveness of their introduction for controlling the structure formation processes of concretes based on recycled aggregates. The additional introduction of sawdust in the amount of 3% and 5% leads to a decrease in the strength of concrete in both bending and compression. However, for systems with 100% granite aggregate content, the percentage decrease in strength is greater compared to compositions that include recycled aggregate. And for systems that include only recycled aggregate, the compressive strength increases by 1 MPa (26.2 MPa, composition No. 10) with a 3% sawdust content and by 0.6 MPa (25.8 MPa, composition No. 15) with a 5% content. Product Description popup.authors Oleksandr Kovalchuk Yaroslav V. Bilan Viktoriia V. Zozulynets Oleh V. Nedin Oleksandr O. Budas popup.nrat_date 2026-01-19 Close