Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/13484
Title: Experimental Studies on Void Detection in Concrete-filled Steel Tubes using Ultrasound
Authors: Dong, W
Wu, Z
Zhou, X
Tan, Y
Keywords: Concrete-filled steel tube;Void area;Ultrasonic testing method;Propagation path;Chromatogram;De-bonding
Issue Date: 2016
Publisher: Elsevier
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.
URI: http://bura.brunel.ac.uk/handle/2438/13484
DOI: http://dx.doi.org/10.1016/j.conbuildmat.2016.10.061
ISSN: 0950-0618
Appears in Collections:Dept of Mechanical Aerospace and Civil Engineering Research Papers

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