Investigations on the effect of gradual cooling on the properties of fly ash concrete subjected to sustained elevated temperatures

摘要

Fly ash is the waste from the coal industries and poses serious problems of disposing. This present study focuses on utilization of fly ash which replaces cement in proportions of 5%, 10%, 15%, 20%, 25%, 30% and subjected to elevated temperatures like 200℃, 400℃, 600℃, 800℃ and 1000℃ followed by gradual cooling. The various strength parameters were studied as per IS. Studies indicate that better strength characteristics in concrete were obtained at 25% replacement of cement by fly ash and subjected to room temperature of 200℃, 400℃, 600℃, 800℃ and 1000℃ followed by gradual cooling. Therefore it is feasible to adopt fly ash as a partial replacement of cement when it is exposed to elevated temperature with gradual cooling.