Abstract

  The results of screenings’ modifying made by fractionating and improving of the grains’ form are given. The comparison of the main properties of sand, ordinary, fractionated and modified fractionated screenings are presented. The influence of different types of fine aggregate on mobility and keeping of concrete mixes, durability of a concrete at early and branded age is defined.

Keywords: screenings, modifying, fractionated, hollowness, water requirement, concrete mixes, mobility, keeping, concrete, strength, density