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Description
The use of concretes is constantly expanding, which is connected to their increased strength at both low and high temperatures, corrosion resistance, service temperature, heat resistance. The most practical application has been obtained by unmolded refractory mixtures of corundum, mullite-corundum, mullite and aluminosilicate compounds.
Conventional dense refractory concretes are a mixture of calcium-aluminate cement (high-alumina or aluminous) with refractory filler (corundum, bauxite, high-alumina or ordinary chamotte). The classification of unmolded refractories by their chemical and mineral composition usually corresponds to the classification of traditional refractories in accordance with GOST 28874.
The product development program guarantees continuous delivery of products of improved and new composition. If necessary, concrete is developed to meet individual requirements or customer specifications. Production specialists continuously monitor these refractories during their manufacture, and also check the properties of the final products to ensure their consistently high quality.
In recent decades, new refractory concretes have been created, which are often called bulk, vibration, thixotropic refractory masses – medium-cement, low-cement, ultra-low-cement, and cementless (including ceramobetones).
In contrast to the traditional technology of vibro-laying, cast concretes (self-flowing at low humidity), as well as technologies for their application (laying) by the concrete spraying method have been developed for the latter.