ABSTRACT
This lecture describes the research on concrete based on waste sand obtained from hydrograding of all-in-aggregate in the Central Pomerania in Poland. Concrete was modified by replacing from 0 to 25% of cement for the silica fume and adding from 0 to 2% of steel fibres. The received results of the research on the fresh concrete mixtures and properties of hardened composite are presented on charts. The author noted a considerable improvement in compression strength and watertightness of the examined concrete mixes.
