Composite cements activated with enriched ash and slag mixtures and shotcrete based on them

The construction industry requires the use of effective materials that meet the growing needs in the design, construction, operation and repair of buildings and structures for various purposes. Object of study: the construction industry requires the use of effective materials that meet the increasing needs in the design, construction, operation and repair of buildings and structures for various purposes. The goal of the work is to develop a scientifically based technological solution aimed at creating effective composite cements activated with enriched ash and slag mixtures, and shotcrete based on them. Methods. A systematic study of the structure and properties of raw materials and cement composites was carried out. To create repair compositions, the theoretical provisions of the law of structure affinity were used. The physical and mechanical properties of the raw material and materials developed on its basis were determined using standard research methods: physical and chemical methods of analysis, laser granulometry, X-ray phase and differential thermal analysis, scanning electron microscopy, etc. Results. A scientifically based technological solution for producing shotcrete using composite cement has been proposed, which consists in the use of technogenic resources based on industrial waste (ash and slag mixtures) and construction (concrete scrap from dismantling buildings and structures), activated and homogenized in a vibration mill, which allows you to control the processes of structure formation due to the affinity of structures and the formation of high-strength new formations. The developed low rebound shotcrete mixture (<8%) provides compaction and strengthening of the adhesive contact zone with the base material of the concrete wall, leading to more efficient load transfer between layers and increasing the overall load-bearing capacity of the entire structure.

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