THE INFLUENCE OF GRANULOMETRY OF VELLA SANDS ON THE PROPERTIES OF REPAIRED MODIFIED COMPOSITIONS

Objectives. Study of the problems associated with the possibility of the effective use of substandard sand dunes of the Shelkovskoye deposit as a mineral additive for the production of fine-ground binders and the enrichment of rock crushing screenings.

Method. They are based on the established principles of the theory of hardening repair modified compositions with the integrated use of vibroactivated mineral and polymer components, and in particular, the filled system “Portland cement - sandstone - C-3”, as well as mathematical logic and technology of composite materials. The studies were carried out taking into account current state standards and recommendations.

Result. The results of the study of local sand dunes and rock crushing screenings are presented for obtaining enriched aggregates with optimal granulometry and properties. Repair compositions were obtained with the use of polymineral sand sand, which are part of the activated binder as a filler, and which are one of the main components of the enriched aggregate.

Conclusion. The optimal formulation of enriched sand was established, with removal of 60% of the fraction 2.5 - 1.25 mm from the crushing screenings and the addition of 40% of the fraction of 0.315 - 0.14 mm of sand sand, which significantly reduces the void content of the aggregate to 38.8% and the water requirement of the aggregate to 6.5%, significantly improving the properties of the repair compositions obtained with their use. It has been proved that the studied sand dunes with a characteristic mineralogical, chemical and particle size distribution are an effective component.

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