EFFECT OF ELEVATED TEMPERATURE ON HIGH PERFORMANCE CONCRETE

Civil Engineering

Concrete is used all over in construction industries. Generally conventional concrete is produced by using natural sand. As sources of natural sand are decreasing, there is need to find out the alternative for natural sand. Now days crushed sand is used as alternative for natural sand. Although concrete gets exposed to various temperature condition e.g. aircraft runway, base foundation of furnace, chimney etc. In such case when temperature is about 100ºC-1000ºC, strength and other properties of concrete gets affected. Generally, strength of concrete decreases when it gets exposed to elevated temperature. As artificial sand is used as alternative for natural sand there is need to study the difference between behavior of concrete manufactured by using natural sand and artificial sand when it is subjected to elevated temperature. In this paper, attempt is made for mix deign of M-40, M-50 concrete using natural sand and crushed sand in which Fly ash as well as Silica fume is used as partial replacement of cement and chemical admixture superplasticizer is also used. Further these grades of concrete are exposed to temperature ranging between 100ºC, 200ºC, 500ºC, 800ºC, 1000ºC for a specific time interval of 60min in electric furnace. Result shows that compressive strength of concrete made by using natural sand after effect of elevated temperature is less affected as that of concrete made by using artificial sand.

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