OPTIMIZATION OF RESOURCE-EFFICIENT WALL BLOCK COMPOSITION BASED ON RECYCLED CONCRETE AGGREGATES AND INVESTIGATION OF THEIR PHYSICAL AND MECHANICAL PROPERTIES

This article examines the possibility of producing resource-efficient wall blocks from recycled concrete aggregates obtained from construction and demolition waste. The main objective of the research was to develop an optimal wall-block composition using recycled concrete aggregates and to assess the principal physical and mechanical properties of the finished blocks. A technological sequence involving crushing, separation into fractions, and incorporation of recycled concrete aggregate into the concrete mixture was proposed. Particular attention was paid to the effect of recycled aggregate content on density, water absorption, and compressive strength. The model results show that increasing the proportion of recycled concrete aggregate decreases density, increases water absorption, and causes a moderate reduction in compressive strength. At 50% recycled aggregate content, a rational balance between strength and resource efficiency was observed. The use of recycled concrete aggregate can reduce the consumption of natural raw materials and promote the reuse of construction waste as a secondary resource.