PZT-Based Detection of Compactness of Concrete in Concrete Filled Steel Tube Using Time Reversal Method

A smart aggregate-based approach is proposed for the concrete compactness detection of concrete filled steel tube (CFST) columns. The piezoceramic-based smart aggregates (SAs) were embedded in the predetermined locations prior to the casting of concrete columns to establish a wave-based smart sensing system for the concrete compactness detection purpose. To evaluate the efficiency of the developed approach, six specimens of the CFST columns with the rectangular cross-section were produced by placing some artificial defects during casting of concrete for simulating various uncompacted voids such as cavities, cracks, and debond. During the test, the time reversal technology was applied to rebuild the received signals and launch the reversed signals again by SAs, to overcome the issue of the lack of the prototype. Based on the proposed nonprototype, two indices of time reversibility (TR) and symmetry (SYM) were applied to relatively evaluate the level of concrete compactness in the range of the two SAs. The experimental results show that the developed method can effectively detect the compactness of concrete in CFST columns.

[1]  Ting-Hua Yi,et al.  Experimental Study on the Compressive Strength of Big Mobility Concrete with Nondestructive Testing Method , 2012 .

[2]  Hoon Sohn,et al.  Time reversal active sensing for health monitoring of a composite plate , 2007 .

[3]  Gangbing Song,et al.  Concrete structural health monitoring using embedded piezoceramic transducers , 2007 .

[4]  Hong-Nan Li,et al.  Methodology Developments in Sensor Placement for Health Monitoring of Civil Infrastructures , 2012, Int. J. Distributed Sens. Networks.

[5]  Fu Jinzhi.  Diagnostic Test about Density of Concrete Filled Steel Tube Column with Smart Aggregates , 2012 .

[6]  Jun Sergio Ono Fonseca,et al.  Simultaneous Piezoelectric Actuator and Sensor Placement Optimization and Control Design of Manipulators with Flexible Links Using SDRE Method , 2010 .

[7]  Gangbing Song,et al.  Health monitoring of reinforced concrete shear walls using smart aggregates , 2009 .

[8]  F. Chang,et al.  Structural health monitoring from fiber-reinforced composites to steel-reinforced concrete , 2001 .

[9]  W. Marsden.  I and J , 2012 .

[10]  M. Fink.  Time reversed acoustics , 2001 .

[11]  Gangbing Song,et al.  Monitoring for Large Cross-Section CFSTs of a Super High-Rise Building with Piezoceramic Actuators and Sensors , 2010 .

[12]  Shi Yan,et al.  Experimental research on crack damage detection of concrete beam based on PZT wave method , 2010, Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[13]  Bin Xu,et al.  Active interface debonding detection of a concrete-filled steel tube with piezoelectric technologies using wavelet packet analysis , 2013 .

[14]  Ting-Hua Yi,et al.  Multi-stage structural damage diagnosis method based on "energy-damage" theory , 2013 .

[15]  F. Chang,et al.  Debond Detection using Embedded Piezoelectric Elements in Reinforced Concrete Structures - Part I: Experiment , 2006 .

[16]  Hoon Sohn,et al.  Reference-Free NDT Technique for Debonding Detection in CFRP-Strengthened RC Structures , 2007 .

[17]  M. Saafi,et al.  Health monitoring of concrete structures strengthened with advanced composite materials using piezoelectric transducers , 2001 .