Mechanical Properties and Microstructure Characteristics of Self-compacting Concrete with Different Admixtures Exposed to Elevated Temperatures

Self-compacting concrete (SCC) is a high-performance widely used as building material. The present investigation examines the effects of age and cooling type (air-cooled water-cooled) SCC after being exposed to elevated temperatures compares them those normal conventional (NCC). Two types concrete; i.e., NCC SCC, were developed studied for early-age residual strengths. was with three different admixtures; namely, fly ash (FA), silica fume (SF) metakaolin (MK) binder materials, by replacing cement. mechanical characteristics FA- SF-blended before heating show similar results, whereas MK-based possesses greater strength than other mixes. In case specimens high temperature 1000℃, MK-blended produced lowest compared SF-based Further microstructural conducted examine internal structure various temperatures. From it concluded that higher gain upon aging, loss rise. KEYWORDS: concrete, Fly ash, Silica fume, Metakaolin, Residual strength, Microstructure.