Research of the main physical and mechanical characteristics of recycled crushed stone for its use as a large aggregate in the production of heavy concrete for general construction purposes
The results of the study of the basic physical and mechanical characteristics of recycled (secondary) crushed stone obtained by crushing (utilization) of concrete, reinforced concrete structures and products are given. It is established that the recycled (secondary) crushed stone consists mainly of the primary granite crushed stone, the surface of which is more or less covered with a mortar part and to a lesser extent with grains (more than 5 mm) of the mortar part of the concrete. Recycled (secondary) crushed stone has a lower strength and frost resistance, as well as true and bulk density compared to granite (control) crushed stone. In addition, recycled (secondary) rubble is characterized by higher porosity and voidness, as well as higher water absorption compared to granite (control) rubble. Reduction of strength and frost resistance of recycled (secondary) crushed stone is associated with the presence of cement-sand stone in its composition.