Investigation of Temperature Effects on Ultrasonic Velocity in a Prestressed Concrete Bridge Model

Liao, Chun-Man; Barroso, Daniel Fontoura

doi:10.1007/978-3-031-07258-1_82

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…Since the temperature influence on the ultrasonic waves was obvious, the velocity change in Fig. 12 was obtained by a temperature correction [14]. The lower CC values explain the unreliable estimation of the velocity change as the bridge was prestressed at less than 300 kN.…”

Section: Cwi Assessment Of Us Measurementsmentioning

confidence: 99%

Real-time bridge monitoring using ultrasonic techniques combined with six-component (6-C) measurements

Liao¹,

Bernauer²,

Igel³

et al. 2022

eJNDT

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This study aims to develop a real time structural health monitoring method by ultrasonic tests combined with advanced six component (6C) translation and rotation measurements. Conventionally, the investigation of the velocity and acceleration response in the translation direction is used to obtain the eigenfrequencies of structures. Recently the measurement of rotation has been considered to fully characterize the dynamic behavior of structures. This research undertakes the evaluation of a novel 6C sensor (IMU50-iXblue) with components originally developed for navigation for the purpose of bridge monitoring. However, as for all vibration recordings, there is a certain influence of environmental conditions (mainly temperature) which may affect evaluation and the results of structural assessment. We propose applying the cross-correlation function to the 6C ambient vibration signals to reconstruct wave propagation and using coda wave interferometry (CWI) to obtain internal velocity variation from waveforms. A field experiment on a large-scale prestressed concrete bridge model is presented. To verify that we are able to identify the pre-stress loss even in presence of temperature effects, we perform measurements in two different scales: the ultrasonic and output-only, vibration measurements. The change in the structural properties due to the pre-stress loss should be detected by the pulse velocity change. The results reveal both the performance and advantages of ultrasonic techniques and the capabilities of 6C sensors. To conclude, the application of CWI to wave signals contributes to a comprehensive assessment for bridge monitoring.

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Section: Cwi Assessment Of Us Measurementsmentioning

confidence: 99%

Real-time bridge monitoring using ultrasonic techniques combined with six-component (6-C) measurements

Liao¹,

Bernauer²,

Igel³

et al. 2022

eJNDT

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“…With increasing curing temperatures, the P-wave propagates faster in the cement paste medium during early hydration ages, which is shown in the results by higher values of both longitudinal and transversal velocities. The velocity of an ultrasound P-wave can be correlated and associated with changes in the microstructural properties of cement-based materials [12][13][14]. Thus, higher pulse velocities values are due to more and more interconnection between cement particles, and so, the cement material tested has a lower void volume [2,15].…”

Section: Effects Of Temperature Variation On Cement Pastementioning

confidence: 99%

Ultrasound Non-Destructive Characterization of Early Hydration of Cement Pastes: The Effects of Water-Cement Ratio and Curing Temperature

Banouni¹,

Khatib²,

Ouacha³

et al. 2022

ACSM

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A newly developed ultrasound method that acquires at the same time both reflected and transmitted P-waves, at different angles, using two immersion transducers of 0.5 MHz central frequency, is described in this present study. This non-destructive method allows calculating the longitudinal and transverse velocities, and thus, the Young modulus, so that its evolutions is followed in time domain. The closely correlation between the evolution in time domain of those calculated parameters and hydration properties of cement based materials was used to characterize the effects of different water-cement ratio and curing temperatures on early age hydration behaviour of cement pastes. To do so, cement samples were prepared by mixing Portland cement and freshwater. Results indicates that lower water to cement ratio reduces the workability and increases the Young modulus of resulted cement medium. Also, both ultrasound velocities and Young modulus values increases linearly with increasing curing temperature.

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Investigation of Temperature Effects on Ultrasonic Velocity in a Prestressed Concrete Bridge Model

Cited by 2 publications

References 9 publications

Real-time bridge monitoring using ultrasonic techniques combined with six-component (6-C) measurements

Real-time bridge monitoring using ultrasonic techniques combined with six-component (6-C) measurements

Ultrasound Non-Destructive Characterization of Early Hydration of Cement Pastes: The Effects of Water-Cement Ratio and Curing Temperature

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