Published Paper Details:

Ultrasonic pulse velocity is a non-destructive method that is used to measure the properties of concrete and detect the damage of recycled aggregates and natural coarse aggregates concrete such as cracks. Due to the demolition of old concrete structures, waste concrete generates an environmental problem. To solve this problem, it is necessary to recover the recycled aggregates from concrete waste. The natural coarse aggregates is replaced by recycled coarse aggregates with the help of crushing the waste concrete and providing new concrete, but there should be a change in the compressive strength and damage occur within the concrete cube. The ultrasonic pulse velocity method was used to detect the damage of concrete such as cracks in the natural coarse aggregate and recycled coarse aggregates concrete. The specimen was a 150x150x150 mm cube concrete specimen. Each concrete cube was examined for velocity readings in sound, modulus of elastic and detected the concrete damaged by applying different loads on natural and recycled concrete. The damage level increases as the ultrasonic pulse velocity decreases. After analysis, the compressive strength of natural coarse aggregate is higher than recycled coarse aggregate concrete and the velocity of natural coarse aggregate is around 19.34% higher than recycled concrete and cracks occur more in recycled concrete as compared to natural coarse aggregate concrete. The higher reduced velocity shows crack formation. The main role of this work lies in comparative study of NCA and RCA, also determining the mechanical properties of concrete including young's modulus of concrete and detecting the damage within concrete through the help of the ultrasonic pulse velocity method.