SMALL-GRAIN CONCRETE BASED ON METALLURGY WASTE

Abstract

The paper presents the approach to the metallurgical waste recycling introducing them into the composition of fine-grained concretes. Blast-furnace produced by OOO „EVRAZ ZSMK‟ is used as a recyclable waste. According to the X-ray diffraction patterns, the blast-furnace is mainly represented by such components as iron and calcium hydrated silicates, quartz, calcite and carbon. It is found that during the hydrothermal treatment of fine-grained concrete, carbonate-containing additives facilitate the formation of hydrated calcium silicates containing carbonate groups the composition of which is close to the that of hydrosilicate phases. The formation of these products in the concrete production contributes to the strength properties improvement in the material obtained and reduces the possibility of late formation of similar phases during its service. This minimizes the carbon dioxide corrosion and shrinkage deformation accompanying this process. It is shown that the use of blast-furnace as fine aggregate in the concrete mix increases the material density and strength by 14 % and 11.2 %, respectively. The water absorption decreases by 5 %, which positively affects the frost resistance of finegrained concretes. The obtained fine-grained concrete provide can be used to produce the M250 concrete grade.