Abstract
To determine the minimum crack width that can be detected using the impact-echo method, two types of laboratory experiment on concrete plate specimens were conducted. In each experiment, a crack was propagated through the plate parallel to the plate surfaces, while surface displacement caused by crack opening was measured and impact-echo tests were performed along the crack trajectory. The relationship between the surface displacement and the real crack opening displacement was established using the results of nonlinear fracture analyses (reported elsewhere). The minimum crack width was determined by estimating the crack opening displacements for each impact-echo test location.
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