BEHAVIOUR OF REINFORCED CONCRETE BEAM WHEN EXPOSED TO HIGH TEMPERATURE WITH 20% REPLACEMENT OF CEMENT BY FLY ASH

Mathangi Niveditha
M.Tech Student (Structures and Construction Engineering), Department of Civil Engineering , IN

Smt.K.Santhosh Bhargavi
M.Tech Student (Structures and Construction Engineering), Department of Civil Engineering , IN

Keywords: Fly Ash (FA); Alkali Resistance Glass Fiber (GF), reinforced concrete beams, fire resistance, flexural strength.

Abstract

Though concrete structures have good fire resistance properties, the structures when exposed to high temperatures for longer duration may lose its strength resulting failure in the structural members. Many structures get damage due to fire accidents. So, to resist the structural damage against fire, Alkali resistance glass fibers were added in concrete mix for different percentages (0%, 1% and 2%) by weight of cement since the glass fiber is good crack arrester and fire resistant material. Some mechanical properties and flexural behaviour of reinforced concrete beams under the effect of high temperature with 20% replacement of cement by fly ash has discussed and M30 grade of concrete is used. The concrete specimens like cubes, cylinders and beams were subjected to high temperatures ranging from (27℃-200℃) for standard duration at the age of 28 days. From this study it is concluded that (20%FA+2%GF) is the best combination among all proportions, which shows maximum compressive strength, tensile strength and better flexural strength at the age of 28 days.

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