Experimental Investigation on Effect of Fire on Properties of Concrete with the Use of Admixture (original) (raw)

Damage due to fire can cause in terms of loss of life, homes and livelihoods. One of the advantages of concrete over other building materials is its inherent fireresistive properties. However, concrete structures must still be designed for fire effects. Structural components must still be able to withstand dead & imposed loads without collapse even though the rise in temperature causes a decrease in the strength & modulus of elasticity for concrete. Fire resistance is measured in terms of structural stability, structural integrity and insulation. This Experimentation involve the study of residual strength in concrete after exposure to elevated temperatures for concrete in which coarse aggregate replace with (20%, 40% and 60%) blast furnace slag and additional 1% steel fiber is added to increase the tensile strength of concrete. The effect of elevated temperature at 200, 400, 600, 800, 1000 and 1200 for the exposure of 1hours are studied. Compressive strength, split tensile strength and flexural strength are obtained after exposure to elevated temperature. Also investigated colour change, area of colour spot, width of crack, types of crack, of samples when exposed to fire at different temperatures and exposure times.