Influence of aggregate on the structure and properties of concrete

Abstract

The dominant role of the binder system and the water-cement ratio has been proven by many studies, but the importance of the aggregate should also be noted, because a large share in the volume of the material belongs to it. By forming a rigid skeleton, the filler participates in the formation of the structure of the composite, and it is it that is responsible for the contact strength with the cement matrix. A study of the physical and mechanical properties and granulometric composition of the filler is necessary to determine the material’s compliance with the requirements of GOST 8267–93. The work carried out on designing the composition of concrete using coarse aggregate from the North Caucasus Federal District made it possible to evaluate the contribution of this component to the process of formation of the structure and strength of concrete stone. Occupying the predominant volume in the mass of concrete, coarse aggregate affects the technical performance, durability and cost of the final product. The study of physical and mechanical properties and granulometric composition of the aggregate will make it possible to correctly design concrete formulations, which is a crucial point in obtaining specified classes of concrete, and will subsequently affect the operational reliability and durability of objects under construction.