Non-destructive testing of high strength concrete using spectral analysis of surface waves

Cho, Young S.

doi:10.1016/s0963-8695(02)00067-1

Cited by 49 publications

(30 citation statements)

References 3 publications

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“…To this end, numerical FFT is used for frequencies contained in the efficient frequency band of the transducer (0.4 to 0.8 MHz). The magnitude and phase spectra are calculated and define the frequency signature (Bracewell 1978;Cho 2003). The phase shift and the amplitude can be computed with the following equations:…”

Section: Frequency Signature Of the Interface Frictionmentioning

confidence: 99%

“…This method can be used to monitor the setting and hardening behavior (Cho 2003;Sun et al 2006). Basically, the objective of employing ultrasonic non-destructive techniques is to measure changes in the characteristics of the ultrasonic signals propagating through a tested fresh concrete specimen, such as amplitude attenuation and frequency shift, which are affected by the material properties and internal microstructure of the concrete (Ju et al 2006).…”

Section: Introductionmentioning

confidence: 99%

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Ultrasonic Wave Reflection Approach to Evaluation of Fresh Concrete Friction

Vanhove

Djelal

Chartier

2008

ACT

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The friction of fresh concrete and granular materials against a metallic plate was investigated using ultrasonic wave reflection. Two complementary experimental devices, one a global device using a tribometer, the other a device based on an ultrasonic reflectometer giving a local approach at the formwork/fresh concrete interface. This approach is based on the evaluation of the density variation of the interface between the metallic wall and the material during the casting process. The authors propose a method to maintain a high impedance contrast by using a water layer interleaved between the transducer and the studied material. Good agreement between the ultrasonic parameter and the friction parameter was observed.

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Section: Frequency Signature Of the Interface Frictionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ultrasonic Wave Reflection Approach to Evaluation of Fresh Concrete Friction

Vanhove

Djelal

Chartier

2008

ACT

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“…It is used to assess the bonding condition between facing stones, mortar, and inner rubble core in stone masonry [21] and the structural integrity of high-performance/high-strength concrete of existing buildings using SAWS (spectral analysis of surface waves) [22]. A mechanical impact on the surface of the structure is used to generate an elastic stress wave that travels through the structure, reflects off external boundaries and internal flaws, and returns to the surface.…”

Section: Testing and Evaluationmentioning

confidence: 99%

Concrete and Cement

Vélez

2008

Ceramic and Glass Materials

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Inorganic concretes are reviewed, emphasizing two major areas: construction concretes and high temperature (refractory) concretes. Although such materials are intended for completely different applications and markets, they have in common that they are made from inorganic ceramic oxides and both materials are used for structural purposes. Current applications and research topics representing new challenges are summarized.

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“…Figure 1 shows the signals detected by the near and far sensors. The time lapse between the first significant signal features, in this case the valleys, of both is taken as the travel time of the surface wave (Cho, 2003).…”

Section: Velocity Measurementsmentioning

confidence: 99%

The Use of Surface Waves to Estimate In-Place Strength of Concrete

Gallo

Popovics

2005

ACT

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Non-destructive evaluation (NDE) techniques are needed to evaluate in-place strength of concrete in structures. Often mechanical wave propagation parameters are used to establish a correlation with strength. P-wave velocity measurements are most common for this purpose, but its application can be problematic. Here the utility of surface waves is investigated. Surface wave velocity and transmission (attenuation) properties are considered, where a self-compensating approach overcomes experimental difficulties usually experienced in transmission measurements. In this paper, the testing configuration is described and the concept of the self-compensating approach introduced. Then a test series is described: surface wave velocity and wave transmission and P-wave through thickness velocity data are collected from concrete slabs of different strengths. Relations between concrete strength, wave velocity and surface wave transmission are established. Surface wave velocity and normalized surface wave velocity data correlate well with in-place strength. Transmission data also are sensitive to concrete strength but data variation must be improved.

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Non-destructive testing of high strength concrete using spectral analysis of surface waves

Cited by 49 publications

References 3 publications

Ultrasonic Wave Reflection Approach to Evaluation of Fresh Concrete Friction

Ultrasonic Wave Reflection Approach to Evaluation of Fresh Concrete Friction

Concrete and Cement

The Use of Surface Waves to Estimate In-Place Strength of Concrete

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