Comparative Experiment on Application of Pouring Defect Identification Technology for Thick Steel-concrete Composite Structure
Based on Zhang-Jing-gao Yangtze River Bridge,this paper puts forward the quality inspection problem of small pouring defects in 30mm thick steel plate concrete through scale model test.In order to clarify the applicability of the existing detection technology in this project,the impact echo method,the impact imaging method and the piezoelectric ceramic method were investigated and selected for the comparative experiment of non-destructive testing methods.The evaluation indexes of defect identification rate and misjudgment rate are proposed.Through the artificial defects laid in the full-scale model of concrete filled steel tube,the results of blind detection of the three methods are compared with the actual location of the defects,so as to analyze the applicability of each method.The experimental results show that the piezoelectric ceramic method has stronger detection ability and higher reliability of detection results.The identification rate of 7 mm thick defects reaches 83.3%,which is more suitable for small defect detection.The impact imaging method has high detection efficiency,good economy and stronger engineering practicability,and the detection ability of small defects is between the piezoelectric ceramic method and the impact echo method.
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