Digital deconvolution analysis of ultrasonic signals influenced by the presence of longitudinally aligned steel cables in pre-stressed concrete

Gaydeck, P A; Burdekin, F.M.; Damaj, W; John, David Gareth; Payne, P.A.

doi:10.1088/0957-0233/3/9/018

Cited by 15 publications

(6 citation statements)

References 3 publications

(4 reference statements)

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“…The results indicated that the received signal increases as the amount of debonding increases. Gaydecki et al (1992) embedded a #2 (0.25 in or 7 mm diameter) steel wire into a concrete mix with 4% calcium chloride solution added to induce corrosion. The reinforced concrete specimen was cylindrical, with an outer diameter of 150 mm (5.91 in) and a length of 1 m (39.37 in).…”

Section: De-bonding Studiesmentioning

confidence: 99%

Nondestructive Inspection of Corrosion and Delamination at the Concrete-Steel Reinforcement Interface

Miller

Hauser

Kundu

2002

Nondestructive Evaluation

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This paper explores the feasibility of detecting and quantifying corrosion and delamination at the interface between reinforcing steel bar and concrete using ultrasonic guided waves. The problem of corrosion and delamination of the reinforcing steel in the aging infrastructure has increased significantly in the last three decades and is likely to keep on increasing. Ultrasonic cylindrical guided waves that can propagate a long distance along the reinforcing steel bar are found to be sensitive to the interface conditions between steel bar and concrete. Ultrasonic transducers are used to launch and detect cylindrical guided waves along the steel bar. The traditional ultrasonic testing methods, for instance the pulse-echo method, where reflection, transmission, and scattering of longitudinal waves are used for detecting large voids in concrete, are not very efficient for detecting corrosion and delamination at the interface between concrete and steel bar. For this study four sets of specimens were prepared. They are rebars and plain steel bars with corrosion and physical separation. Transducers used during the experiment are the Electromagnetic Acoustic Transducer (EMAT) and the Piezoelectric Transducer (PZT). The experiment suggests that the guided wave inspection technique is feasible for the health monitoring of reinforced concrete structures. It also reveals that the ultrasonic guided waves are sensitive to the type of steel used and to the rib patterns on the reformed steel bars.

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Section: De-bonding Studiesmentioning

confidence: 99%

Nondestructive Inspection of Corrosion and Delamination at the Concrete-Steel Reinforcement Interface

Miller

Hauser

Kundu

2002

Nondestructive Evaluation

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“…However, both low and high frequencies caused increase in signal strength. Other effects such as loading conditions [6], reinforcing ribs [8,9,12], corrosion products [9,13], and anchorages [8] on the guided waves have been reported. Reis et al [11] used fundamental flexural mode at frequencies below 250 kHz for estimation of corrosion damage in steel reinforced mortar.…”

Section: Introductionmentioning

confidence: 99%

Longitudinal Guided Waves for Monitoring Chloride Corrosion in Reinforcing Bars in Concrete

Sharma

Mukherjee

2010

Structural Health Monitoring

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Corrosion of reinforcing steel in concrete is one of the major durability problems faced by civil engineers as they maintain an aging infrastructure. The problem accelerates since steel is embedded inside concrete. If it remains unnoticed inside concrete, it further accelerates and can cause loss of life and property. This article discusses a nonintrusive corrosion monitoring technique for early detection of damages in steel embedded in concrete. Corrosion manifests itself in debond and pitting steel bars. Guided ultrasonic waves offer a potentially attractive solution for this problem. But it is imperative to excite the right mode for detection of a particular type of corrosion. In the present work, longitudinal guided ultrasonic waves have been utilized to monitor notch and debond defects in steel bars in concrete simulating pitting and delamination phenomena caused by corrosion. Two ultrasonic techniques of pulse transmission and pulse echo were used to monitor the healthy and damaged specimens. The developed methodology is successfully applied for real time monitoring of RC beam specimens undergoing accelerated chloride corrosion. The ultrasonic signals effectively relate to the state of reinforcing bars.

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“…Extensive literature describes the uses of SAFT to investigate concrete structures [23][24][25][26] and metals, including aluminium [19][20][21] and steel pipes [14,27]. Although this type of ultrasonic imaging has been widely used for Non-destructive Evaluation (NDE) with a moving array of sensors, its application to structural health monitoring is not straightforward and requires the algorithm to be adapted to an array of multiple static transducers.…”

Section: Principle and Evolution Of Defect Imaging With Total Focusinmentioning

confidence: 99%

Structural Health Monitoring Using Lamb Wave Reflections and Total Focusing Method for Image Reconstruction

et al. 2016

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This investigation aimed to adapt the total focusing method (TFM) algorithm (originated from the synthetic aperture focusing technique in digital signal processing) to accommodate a circular array of piezoelectric sensors (PZT) and characterise defects using guided wave signals for the development of a structural health monitoring system. This research presents the initial results of a broader study focusing on the development of a structural health monitoring (SHM) guided wave system for advance carbon fibre reinforced plastic (CFRP) composite materials. The current material investigated was an isotropic (aluminium) square plate with 16 transducers operating successively as emitter or sensor in pitch and catch configuration enabling the collection of 240 signals per assessment. The Lamb wave signals collected were tuned on the symmetric fundamental mode with a wavelength of 17 mm, by setting the excitation frequency to 300 kHz. The initial condition for the imaging system, such as wave speed and transducer position, were determined with post processing of the baseline signals through a method involving the identification of the waves reflected from the free edge of the plate. The imaging algorithm was adapted to accommodate multiple transmitting transducers in random positions. A circular defect of 10 mm in diameter was drilled in the plate, which is similar to the delamination size introduced by a low velocity impact event in a composite plate. Images were obtained by applying the TFM to the baseline signals, Test 1 data (corresponding to the signals obtained after introduction of the defect) and to the data derived from the subtraction of the baseline to the Test 1 signals. The result shows that despite the damage diameter being 40 % smaller than the wavelength, the image (of the subtracted baseline data) demonstrated that the system can locate where the waves were reflected from the defect boundary. In other words, the contour of the damaged area was highlighted enabling its size and position to be determined.Appl Compos Mater (2017) 24:553-573 DOI 10.1007/s10443-016-9549-

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Digital deconvolution analysis of ultrasonic signals influenced by the presence of longitudinally aligned steel cables in pre-stressed concrete

Cited by 15 publications

References 3 publications

Nondestructive Inspection of Corrosion and Delamination at the Concrete-Steel Reinforcement Interface

Nondestructive Inspection of Corrosion and Delamination at the Concrete-Steel Reinforcement Interface

Longitudinal Guided Waves for Monitoring Chloride Corrosion in Reinforcing Bars in Concrete

Structural Health Monitoring Using Lamb Wave Reflections and Total Focusing Method for Image Reconstruction

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