Effect of Additives on the Properties of Fine-Grained Concrete

Abstract

In modern technology of concrete, the fine-grained concretes are widely used. These concretes are highly manufacturable, allow getting a variety of structures and, accordingly, the properties of the material, significantly reduce the cost of concrete through the use of inexpensive local sand and secondary industrial waste. By changing the composition and structure of such concrete, it is possible to obtain fine-grained concrete for various functional purposes on the basis of the same raw materials (only with different complexes of additives). The goal: to study the effect of various additives, including the complex ones, on the physical and mechanical properties of modified fine-grained concrete. Results: the paper proved that the use of air-entraining and complex chemical additives does not increase the air entrainment, but converts the air phase into a system of smaller ordered pores, which leads to an increase in the strength of the material and its durability. The organization of the air phase in the form of a system of thin air pores makes it possible to increase the strength of the material and to improve its other properties: frost resistance, water resistance and others. Conclusions: it is shown that the use of multicomponent composite fine-grained concrete with a regulated air phase will make it possible to obtain materials with a different set of properties.