Nondestructive testing of concrete using highly nonlinear solitary waves

Nasrollahi, Amir; Deng, Wei; Rizzo, Piervincenzo; Vuotto, Alex; Vandenbossche, Julie M.

doi:10.1080/10589759.2016.1254212

Cited by 36 publications

(24 citation statements)

References 47 publications

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“…It can be reasonably deduced that, even though there are no obvious damage for concrete at elastic phase, the velocities and amplitudes of monitoring signals under different stress states are not the same, and it affects the accuracy and effectiveness of evaluation indexes of the monitoring system. Some researchers noted that there exist a great deal of influencing factors in in-situ monitoring, like temperature and loading conditions, which may result in considerable impacts during the monitoring stage [19][20][21][22][23][24][25][26]. Specifically, the construction load has not been taken into consideration during early age concrete monitoring process.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Influence of Stage Load on Health Monitoring of Axial Concrete Members Using Piezoelectric Based Smart Aggregate

Zou

Liu

et al. 2018

Applied Sciences

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Piezoceramic based smart aggregate (SA) has been employed to monitor the strength development of early age concrete. The validity of SA-based active sensing method was tested and verified with loading and unloading conditions. However, the early age concrete in buildings is subjected to many load increments during the construction process. The influence of incremental load on the properties of the propagating waves is still unclear. This study aims to investigate the effects of axial stage loads on the signal response of the SA. The concrete specimens that are embedded with SA's were loaded step by step, and the amplitude and wave velocity of the sensing signals were measured at each stress state. The experimental results indicated that the amplitude of the received signal decrease with the increase of the stress level. As for the velocity of the propagated stress wave, however, the velocity shows an increasing trend before a sharp decline at high stress level.

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Section: Introductionmentioning

confidence: 99%

A Study on the Influence of Stage Load on Health Monitoring of Axial Concrete Members Using Piezoelectric Based Smart Aggregate

Zou

Liu

et al. 2018

Applied Sciences

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“…By solving this equation, the time history of the nth particle's oscillation is obtained and then the displacements of the particles can be used to compute the approach δ = ui+1 − ui and then to apply in the Hertzian relationship. More details about the models are available at [38,41,42]. Figure 5 shows the time-of-flight (TOF) of HNSWs as a function of the Young's modulus for a Poisson's ratio equal to 0.20, which is a typical value for concrete.…”

Section: Model To Extract the Elastic Modulusmentioning

confidence: 99%

“…Figure 6b is a close-up view of Figure 6a and it shows that the TOF of the primary reflected wave increases with an increase in w/c ratio. Not presented here, but detailed in [38], the relative standard deviation (RSD), i.e., the ratio of the standard deviation to the mean, ranged from 0.2% to 0.9%. This proved the high repeatability of the setup.…”

Section: Hnsw Transducers and Upv Testmentioning

confidence: 99%

“…The next section describes the concrete samples, the design of the HNSW transducers, and the test protocols adopted throughout the study. Section 3 presents the experimental results associated with the concrete cylinders and it is largely excerpted from reference [38] in order to provide a comprehensive knowledge in support of the findings of Section 4 that presents the results associated with the short beam. The latter represents the core novelty of the present paper.…”

Section: Introductionmentioning

confidence: 99%

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Detecting the Presence of High Water-to-Cement Ratio in Concrete Surfaces Using Highly Nonlinear Solitary Waves

et al. 2016

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Abstract:We describe a nondestructive evaluation (NDE) method based on the propagation of highly nonlinear solitary waves (HNSWs) to determine the excess of water on the surface of existing concrete structures. HNSWs are induced in a one-dimensional granular chain placed in contact with the concrete to be tested. The chain is part of a built-in transducer designed and assembled to exploit the dynamic interaction between the particles and the concrete. The hypothesis is that the interaction depends on the stiffness of the concrete and influences the time-of-flight of the solitary pulse reflected at the transducer/concrete interface. Two sets of experiments were conducted. In the first set, eighteen concrete cylinders with different water-to-cement (w/c) ratios were cast and tested in order to obtain baseline data to link the ratio to the time of flight. Then, sixteen short beams with fixed w/c ratio, but subject to water in excess at one surface, were cast. The novel NDE method was applied along with the conventional ultrasonic pulse velocity technique in order to determine advantages and limitations of the proposed approach. The results show that the time of flight detected the excess of water in the beams. In the future, the proposed method may be employed in the field to evaluate rapidly and reliably the condition of existing concrete structures and, in particular, concrete decks.

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“…Overlay allows the specific functional performance of civil engineering structures, such as noisiness or anti-corrosion treatments, to be obtained [1][2][3]. It is usually made of concrete or cement mortar.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Evolution within the Interphase between Hardening Overlay and Existing Concrete Substrates

Sadowski

Stefaniuk

2017

Applied Sciences

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This article presents the microstructural evolution within the interphase between a hardening overlay made of cement mortar and an existing concrete substrate. The substrate has been treated using four methods, due to which different surfaces were obtained: a raw surface, a surface formed after contact with the formwork, a grinded surface, and a shotblasted surface. Special focus is placed on the results of the microporosity within the interphase zone (IZ) using X-ray micro computed tomography (micro-CT). The microporosity profiles obtained from the micro-CT images have been used to assess the nature of the IZ between the hardening overlay and the existing concrete substrate. It has been shown that microporosity and the number of pores in the concrete within the IZ increases during the hardening time of an overlay made of cement mortar. It also depends on the applied surface treatment method. However, no significant changes in the microporosity of the existing concrete substrate have been noted.

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Nondestructive testing of concrete using highly nonlinear solitary waves

Cited by 36 publications

References 47 publications

A Study on the Influence of Stage Load on Health Monitoring of Axial Concrete Members Using Piezoelectric Based Smart Aggregate

A Study on the Influence of Stage Load on Health Monitoring of Axial Concrete Members Using Piezoelectric Based Smart Aggregate

Detecting the Presence of High Water-to-Cement Ratio in Concrete Surfaces Using Highly Nonlinear Solitary Waves

Microstructural Evolution within the Interphase between Hardening Overlay and Existing Concrete Substrates

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