Improved assessment of mass concrete dams using acoustic travel time tomography. Part II — application

Kepler, William F.; Bond, Leonard J.; Frangopol, Dan M.

doi:10.1016/s0950-0618(00)00013-1

Cited by 54 publications

(21 citation statements)

References 5 publications

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“…It has been correlated with strength (Kaplan 1959, Kaplan 1960, Kheder 1999, Qasrawi 2000, Naik et al 2004) and damage (Van Hauwaert et al 1998, Ono 1998, Mikulic et al 1999, Aggelis & Shiotani 2008a) of concrete materials, offering rough but valuable estimations because the damage condition influences the mechanical properties and, hence, the wave speed. Employing a number of sensors, the velocity structure of the material can be constructed and the internal condition can be visualized, highlighting the existence of voids or cracks (Sassa 1988, Kepler et al 2000, Kobayashi et 2007, Aggelis & Shiotani 2007b). Furthermore, the use of Rayleigh (or surface) waves seems quite suitable for surface opening cracks investigation, since they propagate along the surface of the structure.…”

Section: Longitudinal and Rayleigh Wavesmentioning

confidence: 99%

“…This kind of dispersion effects are attributed to inhomogeneity (Tsinopoulos et al 2000) and are diminished after repair. Additionally, development in computer and electronic engineering enables tomography reconstruction of the interior characterized by the value of the propagation velocity of either longitudinal or Rayleigh waves, which can be related directly to the mechanical properties of the material (Sassa 1988, Kepler et al 2000, Kobayashi et al 2007. For the full field measurement of a large concrete surface, the newly developed Rayleigh wave tomography methodology is discussed showing the potential to successfully map the subsurface defects, exploiting the connection between penetration depth and applied wavelength (Chai et al 2010).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Elastic Waves on Large Concrete Surfaces for Assessment of Deterioration and Repair Efficiency

Aggelis¹,

Chai²,

Shiotani³

2012

Nondestructive Testing Methods and New Applications

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Section: Longitudinal and Rayleigh Wavesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Elastic Waves on Large Concrete Surfaces for Assessment of Deterioration and Repair Efficiency

Aggelis¹,

Chai²,

Shiotani³

2012

Nondestructive Testing Methods and New Applications

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“…AT uses technology invented for the biomedical field to display the interior of engineered structures. The spatial distribution of acoustic velocity and attenuation are imaged and then correlated with properties directly related to physical conditions (Belanger & Cawley, 2009;Rhazi, 2006;Kepler et al,2000;Meglis et al,2005) . The velocity is determined by the elastic properties and density, while the attenuation is determined by the inelastic property of the medium.…”

Section: Tomographymentioning

confidence: 99%

Non Invasive Acoustic Measurements for Faults Detecting in Building Materials and Structures

Nicolo¹,

Piga²,

Popescu³

et al. 2012

Applied Measurement Systems

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“…A sophisticated approach to concrete inspection using ultrasonic techniques is embodied in the acoustic time travel tomography (ATTT) technique that was employed in the inspection of Barker Dam north of Boulder, Colorado Kepler et al 2000). The ATTT technique was able to detect most of the horizontally oriented defects along the face of the dam.…”

Section: Ultrasonic Testingmentioning

confidence: 99%

Advanced Instrumentation, Information, and Control System Technologies: Nondestructive Examination Technologies - FY11 Report

Meyer¹,

Coble²,

Ramuhalli³

et al. 2011

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Licensees of commercial nuclear power plants in the United States are expected to submit license renewal applications for the period of operation of 60 to 80 years which has also been referred to as long term operation (LTO). The greatest challenges to LTO are associated with degradation of passive components as active components are routinely maintained and repaired or placed through maintenance programs. Some passive component degradation concerns include stress corrosion cracking of metal components, radiation induced embrittlement of the reactor pressure vessel, degradation of buried piping, degradation of concrete containment structures, and degradation of cables.Proactive management of passive component aging employs three important elements including online monitoring of degradation, early detection of degradation at precursor stages, and application of prognostics for the prediction of remaining useful life. This document assesses several nondestructive examination (NDE) measurement technologies for integration into proactive aging management programs. The assessment is performed by discussing the three elements of proactive aging management identified above, considering the current state of the industry with respect to adopting these key elements, and analyzing measurement technologies for monitoring large cracks in metal components, monitoring early degradation at precursor stages, monitoring the degradation of concrete containment structures, and monitoring the degradation of cables.Specific and general needs have been identified through this assessment. General needs identified include the need for environmentally rugged sensors that can operate reliably in an operating reactor environment, the need to identify parameters from precursor monitoring technologies that are unambiguously correlated with the level of pre-macro defect damage, and a methodology for identifying regions where precursor damage is most likely to initiate. v Summary Long-term operation (LTO) of the current fleet of nuclear power plants (NPPs) has been identified as high priority by the U.S. Department of Energy as part of an overall effort to meet rising demands for electricity and meet international obligations to lower greenhouse gas emissions. NPP operators are granted an initial license term of 40 years to operate and are eligible for multiple 20-year license extensions beyond the initial expiration. It is anticipated that most plants will apply for and be granted the initial 20-year license extension (21 initial license renewals have been approved thus far) but subsequent license extensions are less clear due to uncertainties regarding the performance of safety critical systems, structures and components (SSCs) beyond 60 years.Active SSCs (including pumps, valves, and rotating machinery) are well managed and undergo routine maintenance and repair/replacement activities through plant maintenance programs and are not expected to challenge LTO of NPPs. Passive SSCs (pipes, vessels, concrete, and cables) are managed by p...

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Improved assessment of mass concrete dams using acoustic travel time tomography. Part II — application

Cited by 54 publications

References 5 publications

Elastic Waves on Large Concrete Surfaces for Assessment of Deterioration and Repair Efficiency

Elastic Waves on Large Concrete Surfaces for Assessment of Deterioration and Repair Efficiency

Non Invasive Acoustic Measurements for Faults Detecting in Building Materials and Structures

Advanced Instrumentation, Information, and Control System Technologies: Nondestructive Examination Technologies - FY11 Report

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