Abstract

This paper reports the results of using thermally modified silica-manganese slag (TMSS) as coarse aggregates in concrete. The results showed that TMSS is composed of crystalline minerals after thermal modification. The leaching concentration of heavy metals in TMSS is lower than the index limit specified for drinking water sources, indicating that TMSS is environmentally safe to use in concrete. The TMSS coarse aggregate has excellent physical and mechanical properties, and its performance indicators meet the requirements of Chinese national standard. The fluidity and compressive strength of concrete prepared with TMSSCA are comparable to those with natural gravel aggregate.

Keywords:Thermally modified; Silica-manganese slag; Coarse aggregate; Concrete