STUDY ON NON-DESTRUCTIVE INSPECTION OF SLAB COVERED WITH STEEL PLATE BY IMPACT ACOUSTICS METHODS

Abstract

 In the slab covered with steel plates, the defects such as existence of cavities filled with air or water between concrete and the bottom steel plates cannot be viewed. A study purpose is to grasp a state of hardened concrete on the bottom steel plates of steel-concrete composite decks and a state of the re -deterioration of steel plate adhesion reinforcing slabs by impact acoustics methods, for the extension of life of the slabs. The study method is to examine life-size test specimens. As a result, analyzing the frequency distribution and the amplitude ratio of the first wave of the blow sound disclosed thresholds which leads to grasp the state, such as fitness, detachment and water-stagnant.