As for proactive maintenance for infrastructures, it is very important to assess the structural de- terioration from the early stage. Rebar corrosion is one of the major damages in reinforced concrete structures and it is of high demand that corrosion…
As for proactive maintenance for infrastructures, it is very important to assess the structural de- terioration from the early stage. Rebar corrosion is one of the major damages in reinforced concrete structures and it is of high demand that corrosion levels can be estimated reasonably with nondestructive ways. In this study, flexural failure tests of RC beams having different weight loss of 0%, 5%, 10% and 30% were carried out with monitoring acoustic emissions, respectively. Attaching the sensors onto the concrete surface as well as rebar edge faces, AE activity were examined to extract characteristic AE features corresponding to the cor- rosion level. Through the experimental work, it was clarified that the number of AE events of high frequency dramatically decrease with progress of corrosion in comparison to those of low frequency when using the AE activity of rebar attached sensors. The ratio of AE events of low frequency to those of high frequency, which is defined as α-value, yields to provide the corrosion level quantitatively.