The Influence of the Physical Properties of Fine Aggregate Particles on the Technological Properties of Glass Fiber Reinforced Thin-Layer Concrete

Various methods for classifying and evaluating the shape, size, and surface texture of sand particles are examined, highlighting their importance in concrete mixture properties. The study emphasizes the role of particle morphology in determining concrete workability and segregation, particularly in glass fiber reinforced (GRC) thin-layer concrete for building facade panels. The effects of different aggregate types on concrete workability and segregation are analyzed, showing that aggregates with spherical particles and a lower elongation index improve mixture consistency and reduce segregation. Three types of fine aggregates were used for the research. Thin-layer concrete dispersively reinforced with concrete fiberglass using aggregates of different shapes is characterized by a layering of the mixture. The workability and segregation of the fine-grained fiberglass-reinforced concrete mixture depend on the shape of the aggregate particles. Up to 50% of the quartz sand can be replaced with granit stiftings or natural sand, as measured by the segregation index. Increasing the amount of natural sand from 10% to 50% also increases the segregation index from 1.9 to 2.6, and when using granite stiftings aggregates from 2.6 to 3.5, respectively. The segregation index can be calculated according to the method proposed in this paper. Aggregates with spherical particles are more suitable for this thin-layer GRC concrete.