Keyword: «portland cement»

The accumulated experience in the operation of road surfaces in the climatic conditions of the Republic of Sakha (Yakutia) shows that one of the options for increasing the period between repairs of roads is the use of a hard surface – asphalt concrete pavement on a cement concrete base. To reduce shrinkage and temperature deformations inherent in cement concretes, it is advisable to use «lean» concretes, i.e., concretes with a low binder content. The use of mechanical activation technologies in the production of «lean» concrete is an effective way to control the performance properties of building materials.

This study is devoted to the possibility of using graphene-like materials as modifiers to impart self-diagnostic properties to cement composites. It is noted that the introduction of graphene into the cement matrix makes it possible to improve the mechanical characteristics of concrete, as well as endow it with the ability to self-diagnose by changing the electrical parameters during deformation. The authors made prototypes of cement composites with the addition of mildly oxidize graphene and carried out compression tests with the simultaneous registration of electrical resistance. The results demonstrated the potential of using graphene nanomaterials to create self-controlled concretes.

The article discusses the history of creation, physical and chemical properties, and applications of alumina cement (AC) as a special type of binder. It analyzes the key differences between AC and Portland cement in terms of their mineralogical composition, hardening kinetics, and performance characteristics. Special attention is given to the issue of calcium hydroaluminate conversion, which plays a crucial role in the long-term reliability of AC-based materials. The article presents the current prospects for the development of alumina cement production in Russia, including the Ural Federal University's research on import substitution of this product. The article concludes that it is advisable to use alumina cement in special areas of construction, such as repair work, refractory and chemically resistant structures, and dry construction mixtures.