Study of strength characteristics of lightweight shotcrete mixtures from local mineral raw materials depending on heating temperature and amount of finely ground additive

Objective. This article presents the general principles of producing lightweight, heat-resistant shotcrete mixtures using diatomaceous earth aggregates and expanded clay sand on a composite binder of Portland cement with finely ground additives of fired shale and argillite clays and broken ceramic bricks. The aim of the study is to determine the influence of the type and dosage of mineral additives and the heating temperature on compressive and flexural strength.

Method. High-tech equipment, research and testing methods regulated by regulatory documents, in combination with research techniques, and methods of mathematical experimental design were used.

Result. The compressive and flexural strength of heat-resistant shotcrete mixture samples was determined to identify and select the optimal composition for protecting concrete lining structures from exposure to high temperatures.

Conclusion. The developed shotcrete compositions based on a composite binder made from local mineral raw materials exhibit satisfactory physical and mechanical properties and are consistent with the results of other studies, making them promising for strengthening building structures and protecting against high temperatures. The results confirm the feasibility of using these compositions in construction.

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