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|Title:||Experimental Studies on Void Detection in Concrete-filled Steel Tubes using Ultrasound|
|Keywords:||Concrete-filled steel tube;Void area;Ultrasonic testing method;Propagation path;Chromatogram;De-bonding|
|Citation:||Construction and Building Materials, 128(9); pp. 154 - 162, (2016)|
|Abstract:||Due to shrinkage and/or inadequate compaction during concreting, voids may develop in a concrete-filled steel tube (CFST) between the concrete core and outer steel tube, which reduce the confinement effect of the steel tube on the concrete core, and further, decrease the load-carrying capacity and ductility of a CFST. In this study, an ultrasonic technique is utilized for quantifying voids in CFSTs by analyzing the ultrasound travel time in them. Four potential travel paths are identified in CFSTs with/without pre-set voids. By making a comparison of the experimental and theoretical ultrasound travel time, the actual ultrasound travel path is determined in CFSTs. Further, by analyzing the matrix of ultrasound travel time obtained from experiment, a novel method is proposed to generate the chromatogram of the distribution of ultrasound travel time, which is utilized to quantify the voids in a CFST. The chromatogram intuitively shows the position and geometry of the voids in CFSTs and is in reasonable agreement with the pre-set voids. This study, therefore, establishes a new method for quantifying voids in a CFST through the ultrasonic technique.|
|Appears in Collections:||Dept of Mechanical Aerospace and Civil Engineering Research Papers|
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