2045 - Plain concrete mixed with steel mills slag

Vysoká škola báňská - Technická univerzita Ostrava

Vysoká škola báňská - Technická univerzita Ostrava

Patent 2008-20458

The core of the technical solution is the exploitation of silicate, ferrous and manganous disintegration of steel slags in the concrete mixture to improve the water tightness in concrete. During the disintegration the steel slag increases in volume and the pore structure changes in the concrete mixture. This way, the compactness of the concrete mixture rises, and impermeability for water increases too. The increase in the aggregate intermediate fraction improves the concrete microstructure via a decrease in number and size of the capillaries, via filling the caverns in the concrete mixture. Considering the fact that silicate, ferrous and manganous disintegration of steel slags, which is accompanied by an increased volume of the steel slags and may thus lead to degradation of the concrete mixture via slaking, it is vital to substitute the intermediate fraction aggregate, i.e. size 4/8 mm, with steel slags to ensure increased water tightness and good concrete mixture strength. Natural or artificial aggregates need to be used for the fraction 0/4 mm and fraction 8/16 mm in the concrete mixture in order to eliminate the mechanical disintegration of slags and prevent lower strength in the concrete mixture matrix.

Organized by:                                                                                                 Expert guarantee: