Modern high-tech concretes based on polycarboxylate esters for the protection of energy facilities in Ukraine

Abstract

The use of chemical additives based on polycarboxylate esters is an effective means of regulating the rheological properties of concrete mixtures, modifying the structure of cement stone in concrete and the concrete itself, and therefore improving its physical and mechanical characteristics and guaranteeing durability. Obtaining high-performance concrete is achieved by meeting many requirements arising from the physical foundations of concrete structure formation, namely: the use of high-strength cements and aggregates, the use of the lowest possible water-cement ratio. The use of modifiers ensures the efficiency of concrete laying, the formwork of monolithic structures in the shortest possible time with sufficient quality of the latter, the production of thin-walled thick-reinforced structures of increased strength, the possibility of carrying out construction work both in winter and in dry, hot conditions. The term "high-tech" concrete includes multicomponent concrete with high operational properties, strength, durability, low diffusion coefficient and abrasion, reliable protective properties in relation to steel reinforcement, high chemical resistance. The purpose of the work is to obtain concrete of a given class with high indicators of early strength, average density and resistance of hardened concrete to aggressive factors, which is ensured by the quality of the cement used and the introduction of chemical additives. Purpose of the article a whole range of specialized highly functional concretes with superplasticizers of the new generation based on polycarboxylate esters and air-entraining additives has been developed, and by adjusting the ratio of the steric factor and the anionic activity of polycarboxylate esters in a complex with highly soluble electrolytes, high-tech and cast concrete mixtures with a long-term preservation of their ease of work have been obtained, which guarantees obtaining concrete with increased early strength, high operational properties, including reliable protective properties in relation to steel reinforcement and high chemical resistance.