![]() Nondestructive and destructive methods are commonly adopted in assessing the service condition of bridges between the two, destructive methods are often of low efficiency and poor economic effect because they may core, drill, or include load test on the bridge structure. ![]() Therefore, measuring the depth of surface-opening crack to realize appropriate maintenance schedule is of considerable importance. Surface-opening crack is one of the most common defects for concrete bridges it reduces stiffness and allows aggressive media, such as water and chloride, to corrode the reinforced bars, thereby causing the loss in load-carrying capacity. The USA spend approximately $10 billion annually on the repair and maintenance of their existing bridges. ![]() However, most of the bridges constructed decades ago have experienced different levels of degradation after being subjected to long-term environment attacks and load effects. Bridge engineering has considerably developed in the past few decades.
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