Review of NDT methods in the assessment of concrete and masonry structures

McCann, D. M.; Forde, M. C.

doi:10.1016/s0963-8695(00)00032-3

Cited by 567 publications

(290 citation statements)

References 10 publications

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“…Moreover, the ranging resolution can be considered as R 0 ¼ 1:04 mm at 2.0 m from Fig. 5, and each ranging costs averagely 12∼13 ms (76.9∼83.3 Hz), which shows the ranging speed is quicker than the vibrating rate of most civil constructions (a dozen hertz) [1,2]. In brief, the ranging results show that the proposed radar has an unambiguous range of 100 m larger than that of SFCW radar [4], a ranging resolution of 1.04 mm higher than that of pulse, FMCW and SS radar [3,5,6], and a ranging speed of 12∼13 ms quicker than that of MFCW radar [4,7] mentioned above, which verifies the validity of proposed radar system and shows it is more adaptive to vibrating constructions compared with the major radars mentioned.…”

Section: Experiments and Analysismentioning

confidence: 99%

“…In order to identify early structural damage and enable remedial actions to be taken, monitoring the displacements and vibrations of civil engineering constructions such as bridges, buildings, and towers is very important [1,2], in which ranging is the basis and key of great importance. Hence, ranging system should be insensitive to abrupt changes of environmental conditions such as dust and rain because the constructions are almost built in outdoor environment.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, ranging system should be insensitive to abrupt changes of environmental conditions such as dust and rain because the constructions are almost built in outdoor environment. Besides, it is needed that the unambiguous range of ranging system could be as large as possible for the large size of constructions such as 100 m or even 1 km etc [1,2]. Moreover, in order to identify the structural damage accurately and quickly for vibrating constructions, ranging system should have a ranging resolution of mm or sub-mm and a ranging speed quicker than the vibrating rate of constructions (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, in order to identify the structural damage accurately and quickly for vibrating constructions, ranging system should have a ranging resolution of mm or sub-mm and a ranging speed quicker than the vibrating rate of constructions (e.g. a dozen hertz) [1,2]. Hence, the microwave radar is an ideal and practical ranging system as microwave is insensitive to environmental changes and can penetrate through rain and fog etc.…”

Section: Introductionmentioning

confidence: 99%

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A microwave radar system based on carrier modulation and heterodyne phase difference detecting with time-to-digital converter

Zheng

Chen

et al. 2014

IEICE Electron. Express

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Abstract:To solve the problems of the major kinds of microwave radars to meet the ranging needs of vibrating constructions, a new type of radar system for ranging is proposed based on the carrier modulation and heterodyne phase difference detecting with time-to-digital converter (TDC). In the radar system, an intermediate frequency (IF) signal is used to modulate the amplitude of radio frequency (RF) carrier signal to produce transmitting signal, and radar system receives the back-reflected signal from the target and demodulates the IF signal to expand the unambiguous range. Then, the heterodyne processing and phase detector with TDC device are adopted to detect phase shift of IF signal for ranging to improve the ranging resolution and ranging speed. In addition, the ranging experiment results proved the feasibility and validity of the presented radar system.

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Section: Experiments and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A microwave radar system based on carrier modulation and heterodyne phase difference detecting with time-to-digital converter

Zheng

Chen

et al. 2014

IEICE Electron. Express

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“…The parameter of resistivity is in direct relation to the concrete moisture (McCann and Forde, 2001;Polder, 2001), indicating the areas that are more susceptible to infiltration or leakage. The dominant mechanism of the electric current flow is the ion transmission through the fluids filling the cement voids.…”

Section: Investigation On the Dam Structurementioning

confidence: 99%

Geophysical methods contributing to the testing of concrete dams. Application at the Marathon Dam

Karastathis

Karmis

Δρακάτος

et al. 2002

Journal of Applied Geophysics

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Geophysical investigations were conducted at the Marathon Dam site near Athens, Greece, in order to detect possible degraded areas that are potentially liable to water infiltration or leakage, and to evaluate the dynamic properties of the subsurface materials. The investigations were also extended in the dam interior in order to evaluate the quality of the concrete. This survey was necessary because the dam was hit by a strong (Ms = 5.9) earthquake in 1999. The methods implemented included geoelectrical, seismic and GPR techniques. The potential of seismic methods to assess the dynamic properties of the material, the great dependence of electrical methods on the moisture content and the high resolving power of GPR in recognizing local structure anomalies proved to be the main contributing factors to the proper evaluation of the dam. The geophysical techniques also indicated a few suspicious parts in the dam that warrant close inspection by specialist engineers. D

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New and Emerging Technologies in Structural Health Monitoring

Enckell

Andersen

Glišić

et al. 2013

Handbook of Measurement in Science and Engineering

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Measuring and testing activities have been performed from the beginning of the twentieth century within engineering. Early activities in structural health monitoring were damage identification in aerospace and mechanical engineering. Aircrafts and military vehicles needed monitoring, and a lot of sensors were developed for these purposes. It was also common to perform damage identification with rotating machines, which was called condition monitoring. Organized structural health monitoring (SHM) activities became more acknowledged in the last decades and emerged various engineering disciplines. Today, also many civil engineering structures are monitored continuously and provide true real‐time information of these structures. Technical development of sensory technology has been rapid and is still ongoing. Several new techniques are available on the market and provide higher performance and innovative, more reliable measurements. Fiber‐optic sensors, advanced NDT methods such as acoustic emission, radar‐based techniques, in addition to micro electromechanical systems (MEMS) technology together with advanced data acquisition techniques and database automation supply for beneficial SHM. This paper presents new and emerging technologies and new areas of usage; mostly for the civil engineering structures. It highlights their advantages and also brings up with challenges. Some real applications are presented in order to give a true picture about SHM with new and emerging technologies and complexity of the subject.

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Review of NDT methods in the assessment of concrete and masonry structures

Cited by 567 publications

References 10 publications

A microwave radar system based on carrier modulation and heterodyne phase difference detecting with time-to-digital converter

A microwave radar system based on carrier modulation and heterodyne phase difference detecting with time-to-digital converter

Geophysical methods contributing to the testing of concrete dams. Application at the Marathon Dam

New and Emerging Technologies in Structural Health Monitoring

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