Residual properties of alkali-activated slag concrete exposed to elevated temperatures

Purpose This paper attempted to study the alkali-activated (AA) binder consisting of 94% of ground granulated blast furnace slag (GGBFS) and 6% of blended powder of alkali metal hydroxide and metal sulfate, which acted as an activator. Design/methodology/approach Several concrete specimens (cubes, cylinders and prisms), which were casted using AA binders, were further tested for mechanical properties after exposure to elevated temperatures of 200 degrees C, 400 degrees C, 600 degrees C and 800 degrees C. Additionally, to understand the structural behavior in uniaxial compressive load, reinforced concrete short columns were cast, cured and tested at ambient temperature as well as after exposure to 300 degrees C, 600 degrees C and 900 degrees C, to know the residual strength after exposure to elevated temperature. Findings The findings for the residual strength of alkali-activated slag binder concrete (AASBC) indicated a substantial agreement with the results obtained for the residual strength of Portland slag cement (PSC) concrete, thereby showing the effectiveness of binder when used as a replacement of cement. Originality/value The study clearly indicates that the binder developed is an effective approach for the 100% replacement of cement in the concrete.