MODIFIKASI KOEFISIEN DIAGRAM TEGANGAN BETON SERAT PADA BERBAGAI SUHU

Abstract

Fiber concrete is a building material that has been widely introduced in Indonesia. The advantages of fiber concrete are that it can increase the tensile strength of concrete, besides fiber concrete can increase ductility compared to concrete without fibers. In this study, steel wire fibers were used. The weakness of this fiber concrete is against high temperatures. Experiments were carried out with reinforcing fiber concrete at temperatures of 332°C, 621.4°C, and 957.4°C. Fiber concrete that is burned at high temperatures has a significant decrease in strength when it is burned reaching a temperature of 957.4°C. On the stress curve, fiber concrete that is burned at a temperature of 621.4°C has a stress drop of up to 67%. The stress-strain behavior of steel-wire fiber concrete is very ductile when compared to fiber-free concrete. In the concrete stress diagram, the ß1 and k3 coefficients in fiberless concrete and fiber concrete are not the same. Based on the calculations carried out, the value of k3 in fiber concrete at various temperatures is taken as 0.92fc’, while the value of ß1 in fiber concrete at various temperatures is 0.75.