Use of network theory to improve the ultrasonic tomography in concrete.

The ultrasonic tomography is an important tool in nondestructive evaluation of concrete structures. It is usual to consider in ultrasonic reconstruction that the mechanical waves only propagate in straight-lines between the transmitter and the receiver transducers, corresponding to the behavior in a homogenous material. In a concrete specimen, however, mechanical waves may deviate from an internal flaw, which affects the resulting tomograms. In this study, the ray tracing technique based on the Network Theory, which allows to consider waves not travelling in a straight-line, was incorporated into the tomography processing. Experimental tests were carried out on concrete specimens with different internal flaws. The results indicated the importance of using the ray tracing technique to properly detect the size and the shape of internal flaws, improving the obtained tomograms. All the necessary algorithms for the application of the Network Theory were presented.

[1]  Tomoki Shiotani,et al.  Evaluation of Repair Effect for Deteriorated Concrete Piers of Intake Dam Using AE Activity , 2006 .

[2]  Bing Zhou,et al.  3D ray tracing using a modified shortest-path method , 2007 .

[3]  Pier Paolo Delsanto,et al.  Ultrasonic tomography using curved ray paths obtained by wave propagation simulations on a massively parallel computer , 1996 .

[4]  Tomoki Shiotani,et al.  Numerical simulation of elastic waves for visualization of defects , 2011 .

[5]  Larry D. Olson,et al.  Acoustic Tomography for Qualitative Nondestructive Evaluation (QNDE) of Structural Concrete using a New Ultrasonic Scanner Source , 1995 .

[6]  Aldo De La Haza,et al.  Assessment of concrete structures using the Mira and Eyecon ultrasonic shear wave devices and the SAFT-C image reconstruction technique , 2013 .

[7]  Dan M. Frangopol,et al.  Improved assessment of mass concrete dams using acoustic travel time tomography. Part II — application , 2000 .

[8]  David Gubbins,et al.  Three-dimensional seismic ray tracing , 1977 .

[9]  Daryl R. Tweeton,et al.  BoMCRATR--a curved ray tomographic computer program for geophysical applications , 1992 .

[10]  Chu Yanli,et al.  The Shortest Path Ray Tracing Algorithm in Concrete Computerized Tomography , 2010, 2010 International Forum on Information Technology and Applications.

[11]  Edsger W. Dijkstra,et al.  A note on two problems in connexion with graphs , 1959, Numerische Mathematik.

[12]  T. Shiotani,et al.  Acoustic Emission and Ultrasound for Damage Characterization of Concrete Elements , 2009 .

[13]  Steven R. Doctor,et al.  SAFT — the evolution of a signal processing technology for ultrasonic testing , 1986 .

[14]  Michael Forde,et al.  Ultrasonic tomography of grouted duct post-tensioned reinforced concrete bridge beams , 2001 .

[15]  Masayasu Ohtsu,et al.  Identifying voids in plastic ducts in post-tensioning prestressed concrete members by resonant frequency of impact–echo, SIBIE and tomography , 2007 .

[16]  A. Kak.  Computerized tomography with X-ray, emission, and ultrasound sources , 1979, Proceedings of the IEEE.

[17]  Avinash C. Kak,et al.  Principles of computerized tomographic imaging , 2001, Classics in applied mathematics.

[18]  T. Moser.  Shortest path calculation of seismic rays , 1991 .

[19]  Tomoki Shiotani,et al.  Elastic wave validation of large concrete structures repaired by means of cement grouting , 2009 .

[20]  G. Herman,et al.  Algebraic reconstruction techniques (ART) for three-dimensional electron microscopy and x-ray photography. , 1970, Journal of theoretical biology.

[21]  Clifford H. Thurber,et al.  A fast algorithm for two-point seismic ray tracing , 1987 .

[22]  J. R. Frederick,et al.  Improved ultrasonic nondestructive testing of pressure vessels , 1979 .

[23]  Tomoki Shiotani,et al.  Large-scale evaluation of concrete repair by three-dimensional elastic-wave-based visualization technique , 2013 .

[24]  Daryl R. Tweeton,et al.  MIGRATOM : geophysical tomography using wavefront migration and fuzzy constraints , 1994 .

[25]  Honghui Fan,et al.  ULTRASONIC TIME OF FLIGHT COMPUTED TOMOGRAPHY FOR CONCRETE INSPECTION , 2012 .

[26]  J A Sethian,et al.  A fast marching level set method for monotonically advancing fronts. , 1996, Proceedings of the National Academy of Sciences of the United States of America.

[27]  Krishnaiah Chevva,et al.  Assessment of concrete quality using non-destructive techniques, Ghatghar project, Maharashtra, India , 2008 .

[28]  James F. Greenleaf,et al.  Reconstruction of Three-Dimensional Velocity Fields and Other Parameters by Acoustic Ray Tracing , 1975 .

[29]  Dan E. Dudgeon,et al.  Multidimensional Digital Signal Processing , 1983 .

[30]  Vladimir G. Haach,et al.  Qualitative assessment of concrete by ultrasound tomography , 2016 .

[31]  Youngjib Ham,et al.  Integrated visualization for reinforced concrete using ultrasonic tomography and image-based 3-D reconstruction , 2016 .

[32]  M. Schickert,et al.  Progress in ultrasonic imaging of concrete , 2005 .

[33]  P. Gilbert.  Iterative methods for the three-dimensional reconstruction of an object from projections. , 1972, Journal of theoretical biology.

[34]  F. A. Firestone.  The Supersonic Reflectoscope; an Instrument for Inspecting the Interior of Metal Parts by Means of Sound Waves , 1944 .

[35]  S. L. Lee,et al.  Algebraic Reconstruction of Spatial Distributions of Acoustic Absorption within Tissue from Their Two-Dimensional Acoustic Projections , 1974 .

[36]  Kaoru Yamaguchi,et al.  A NUMERICAL EXPERIMENT ON NONLINEAR IMAGE RECONSTRUCTION FROM FIRST-ARRIVAL TIMES FOR TWO-DIMENSIONAL ISLAND ARC STRUCTURE , 1986 .

[37]  A. Filler.  The History, Development and Impact of Computed Imaging in Neurological Diagnosis and Neurosurgery: CT, MRI, and DTI , 2009 .

[38]  T. Shiotani,et al.  Repair evaluation of concrete cracks using surface and through-transmission wave measurements , 2007 .

[39]  Xibin Xu,et al.  Tomographic diagnosis of defects in hydraulic concrete structure , 2008 .

[40]  V. M. Malhotra,et al.  CRC Handbook on Nondestructive Testing of Concrete , 1990 .

[41]  Dan M. Frangopol,et al.  Improved assessment of mass concrete dams using acoustic travel time tomography. Part I — theory , 2000 .

[42]  Andrew J. Boyd,et al.  Evaluation of damage to bridge piers using pulse velocity tomography , 2013 .

[43]  Marc O. Eberhard,et al.  IMAGING OF REINFORCED CONCRETE: STATE-OF-THE-ART REVIEW , 1995 .