INFLUENCE OF ULTRAFINE ACTIVE MINERAL ADDITIVES ON THE PROPERTIES OF LOW-CARBON HIGH-PERFORMANCE CONCRETES

Abstract

The article presents the research results of the influence of plasticizing-accelerating addmixtures together with ultrafine activemineral additives obtained by mechanical activation on the  properties of low-carbon high-performance concrete. The increase in demand for new-generation concretes, in particular high-performance concretes, which are characterized by improved construction and technical properties and are used to increase the load-bearing capacity, reduce the own weight and material density of structures, as well as for the repair and restoration of damaged reinforced concrete structures, leads to an increase consumption of portland cement, which has a significant impact on the environment due to the large amount of CO2 released during clinker production. Therefore, in order to reduce the clinker factor and modify the microstructure of the cementitious matrix for low-carbon high-performance concrete, ultrafine  mineral additives were used. The work shows, that the  combination of complex chemical admixtures with a plasticizing-accelerating effect and ultrafine mineral additives makes it possible to obtain highperformance concrete mixtures with increased workability and homogeneity, and concretes on their base with high early and final strength, improved deformable properties, density, increased frost resistance, and in the end, durability, which allows them to be widely used in construction and reduce the negative impact on the environment. The production and use of low-carbon sustainable concretes make a substantial contribution to climate protection.Developed clinker-efficient high-performance concretes will also become increasingly important in building construction and civil engineering and provide new solutions to the need for a low-carbon development strategy.