Road Concrete with Screenings of Igneous Rocks

The use of screenings of igneous rocks containing the dust-like particles (not more than 10% by weight) extends the list of efficient aggregates for the pavement concretes. The peculiarities of the grain size distribution of screenings, namely, an increased content (up to 10% and over) of dust-like particles and specific grain shapes, prevented the wide use of screenings. Specific shapes of screening grains with a predominance of needle-shaped and splintered grains according to the strength theory play a positive role in obtaining a stronger and crack resistant structure of road concrete. The use of screenings for road concretes makes it possible to provide waste-free production of crushed stone and to improve ecology.