Elastic wave validation of large concrete structures repaired by means of cement grouting

Shiotani, Tomoki; Momoki, Shohei; Chai, Hwa Kian; Aggelis, Dimitrios G.

doi:10.1016/j.conbuildmat.2009.01.005

Cited by 53 publications

(18 citation statements)

References 15 publications

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“…Aggelis and Shiotani visualized a crack and confirmed the effectiveness of repair in two-dimensional analysis [2]. Shiotani et al applied the technique for soundness evaluation of concrete piers of water intake facility by carrying out a series of large-scale measurements [3]. For the elastic wave tomography, the velocity distribution is reconstructed by identification techniques such as Simultaneous Iterative Reconstruction Technique (SIRT).…”

Section: Introductionmentioning

confidence: 99%

Mesh-independent ray-trace algorithm for concrete structure

Kobayashi

2013

Construction and Building Materials

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Section: Introductionmentioning

confidence: 99%

Mesh-independent ray-trace algorithm for concrete structure

Kobayashi

2013

Construction and Building Materials

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“…In AE tomography, past reports can be found in literatures [1] and [2]; however, as they did not consider diversion of wave propagation paths (hereafter referred to as ray paths), few successful results can be obtained. In consideration of the diversion of the ray paths, the basic analytical procedure and the applicability of these techniques have already been reported as elastic-wave tomography [3] and AE tomography [4] by authors.…”

Section: Introductionmentioning

confidence: 99%

Lateral Damage Identification in RC Slabs by Several Tomographic Approaches with Rainy Induced Elastic Waves

Shiotani¹,

Hashimoto²,

Asaue³

et al. 2018

SV-JME

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It is generally recognized that preventive and proactive maintenance works are necessary for such important infrastructure as bridges and tunnels. For reinforced concrete (RC) members, essential issues include establishing a maintenance system with the appropriate measures prior to the extensive damage and failure.As a result of budgetary restrictions, preventive and proactive maintenance of infrastructure are desired, and thus inspections by non-destructive testing (NDT) methods providing early damage information must be applied. In terms of the damage assessment and estimation of repair and retrofit recovery in concrete structures, in addition to current NDT, innovative methods must be established.The authors are thus studying tomography techniques based on elastic waves and acoustic emission (AE) to visualize three dimensional internal defects in concrete. In AE tomography, past reports can be found in literatures [1] and [2]; however, as they did not consider diversion of wave propagation paths (hereafter referred to as ray paths), few successful results can be obtained. In consideration of the diversion of the ray paths, the basic analytical procedure and the applicability of these techniques have already been reported as elastic-wave tomography [3] and AE tomography [4] by authors.Through the tomography technique, internal conditions are obtained using elastic wave parameters such as amplitudes and elastic wave velocities. This technique has been developed in the field of seismology and geophysics [5] to [7] as well as ultrasonic [8] to [10]. In this study, elastic wave velocity and attenuation rate are [11] used as the parameter. In elastic wave tomography, both the location of the excitation and the excitation time are known, whereas they are unknown for AE tomography. Specifically, the tomography can evaluate the elastic wave velocity Efficient inspection techniques for ageing infrastructures are in great demand. In this study, rainy induced acoustic activity, which has so far been treated as a nuisance event for acoustic monitoring, is ambitiously utilized to identify damages of reinforced concrete (RC) slabs. Specifically, in-situ acoustic emission (AE) measurements of RC bridge slabs are conducted for a week. First, internal damages of the slabs are evaluated by both of AE activity and elastic wave velocity by means of AE monitoring and AE tomography. As for some representative locations showing each different damage estimated by the AE activity and the velocity, core samples are retrieved for the verification. In addition, AE activity induced by rain droplets in a short period of minutes are identified by an AE source location algorithm followed by computation on attenuation rate distribution. Through the evaluations, it was found that the distribution of AE sources induced by precipitation could reflect internal damage of RC slabs i.e., dense areas of source locations imply the intact or minor damage, while sparse areas of source locations suggest serious damage of RC decks. With this finding, the p...

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“…Seismic tomography is originally developed for the exploration of underground resources, and then recently applied for the soundness investigation of concrete structures (Shiotani et al, 2009). The author has been studied for the method of seismic tomography for soundness investigation of concrete structures of irregular shape.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional seismic tomography with tetrahedra element on isoparametric mapping

Kobayashi

2012

IJSTRUCTE

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The author has developed a method of three-dimensional seismic tomography on concrete structures. This method is based on ray-trace and identification technique, and the distribution of slowness or energy dissipation is identified based on simultaneously iterative reconstruction technique (SIRT) or the other kind of statistical identification technique. This kind of technique was originally developed for investigation of underground that is called geotomography, however, this technique was difficult to apply to concrete structures because the structures generally have irregular shape. A hexahedral element was implemented by the author to overcome this difficulty based on the idea of isoparametric mapping of hexahedral element on finite element analysis, however, it is still difficult to apply the method to the structures that have highly irregular shape. In this respect, an implementation of tetrahedral element is proposed for the three-dimensional seismic tomography on concrete structures to solve the difficulty in this paper. This implementation is based on the idea of isoparametric mapping as well as the case of hexahedral element and it enables to apply the method to structures of complex shape that is insufficient to represent by hexahedral elements. The validity of the proposed method is checked by some numerical example.

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Elastic wave validation of large concrete structures repaired by means of cement grouting

Cited by 53 publications

References 15 publications

Mesh-independent ray-trace algorithm for concrete structure

Mesh-independent ray-trace algorithm for concrete structure

Lateral Damage Identification in RC Slabs by Several Tomographic Approaches with Rainy Induced Elastic Waves

Three-dimensional seismic tomography with tetrahedra element on isoparametric mapping

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