Concrete is widely used construction material in civil engineering structures due its high compressive strength. When concrete is exposed to elevated temperatures, it looses density, stiffness and strength. In the present work, dunite is used as a replacement of sand to study the performance of concrete under elevated temperatures. It is found that the concrete gains strength by adding 20% of dunite as a replacement in sand when compared to normal concrete. Impact of dunite on ultrasonic pulse velocity is also studied to evaluate the structures exposed to elevated temperatures using nondestructive testing. It is observed that the U.P.V values of dunite concrete are 1.2 times higher than the values corresponding to normal concrete U.P.V values.
Dunite, elevated temperature, strength of concrete, ultrasonic pulse velocity
