Define the Cavitation - underwater inspection of bridge?
Cavitation damage is caused by repeated impact forces caused by collapse of vapour bubbles in rapidly flowing water. The appearance of concrete damaged by cavitation is generally different from that damaged by abrasion erosion. Instead of a smooth, worn appearance, the concrete will appear very rough and pitted. In severe cases, cavitation may remove large quantities of concrete and may endanger the structure. Usually cavitation occurs as a result of water velocities greater than 12 m/sec.