UTILIZATION OF HIGH-TONNAGE BY-PRODUCTS FROM THE KUZBASS STEEL INDUSTRY IN COMPOSITE FINE CONCRETES FOR HIGHER WATERPROOFNESS

The partial utilization of the landfills complex, for construction materials and cement production (blast-furnace slags and others), does not exhaust the potentialities of the industrial wastes. The chief reasons for the unsatisfactory utilization of the open-hearth slags are as follows: mixed chemical and mineralogical compositions, unstable structure and large metal inclusions. These slags contain up to 22% ferric oxides and up to 15% metallic iron. In 2003, a crushing-sorting installation for the extraction of metallic inclusions was built and put into operation at the steel plant in Novokuznetsk. The magnetic part (scrap) is used as a raw material for melting steel in open-hearth furnaces while the non-magnetic one is separated into two size fractions (0 to 20 and 20 to 70 mm) which may find wide application to the manufacture of structural materials, first of all, to road construction, binding materials and fine concretes. The objective of the study is to create, in prospect, a composite fine concrete of a higher waterproofness using steelmaking slags. Slag is supposed to be utilized both in the manufacture of a composite binder and as an aggregate by its introduction into concrete during its production. After a three-stage crushing, sorting out and magnetic separation of the above slags, their physical properties, chemical and mineralogical compositions were studied. Also, they were tested for radionuclides and toxic metals contents. From the chemical analysis, the slags are medium-basic slags. They contain calcite, dicalcium silicate, aluminum silicate, quartz and other minerals. According to the radiation safety regulations, the slag is referred to as a first class slag and may be utilized without any restrictions.

• INTRODUCTION

• PROBLEM CONSIDERATION

• PREREQUISITES FOR THE UTILIZATION OF “KSC STEEL” SLAGS

• FUTURE WORK

• REFERENCES