Effect of chemical admixtures on the durability of fine-grained concrete

Abstract

Currently, high demands are placed on the quality of building materials, regardless of the purpose of the buildings being built or the structure. Concrete currently occupies a high position in the construction industry. In developing countries, the issue of urban transport infrastructure is relevant, including the construction of highways and the laying of a large number of metro lines and urban railways, and the laying of engineering systems that require the construction of a significant number of tunnels and other underground facilities using fine-grained concrete.   All these structures require high-strength fine-grained concrete, currently increasing the strength and durability of concrete is successfully solved by modifying it. With the help of the influence on the structure formation of cement systems, the blog of additives makes it possible to obtain high-strength concretes with high corrosion resistance. As a rule, fine-grained mixtures have increased viscosity and reduced mobility compared to conventional concretes. The amount of air in compacted jet fine-grained mixtures is much larger than in conventional ones, and its removal is difficult due to the large viscosity structure of fine-grained mixtures and the dispersion of air in them.