Summary of Large Concrete Samples

Clayton, Dwight A; Smith, Cyrus M

doi:10.2172/1087046

Cited by 4 publications

(6 citation statements)

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“…This includes minimizing artifacts caused by boundary effects. Although significant NDE research has been conducted on thin PCC structures to assess pavement, bridge deck, and other infrastructure applications, construction of large reinforced concrete specimens specifically for NDE comparisons is less common [5], [6]. Comparative studies have shown various NDE techniques to be successful in identifying the types of internal characteristics of interest, requiring only one-sided access [2], [11]-[ Fig.…”

Section: Need For Suitable Concrete Specimensmentioning

confidence: 99%

“…However, as detailed in ORNL/TM-2013/223 [6] and discussed in the "Need for Suitable Concrete Specimens" section, there are problems associated with use of in-service specimens for validation of NDE methods. The acquisition of such samples can be prohibitive due to the costs of transporting such a large concrete structure, lack of on-site access for research teams to collect data for comparative testing, lack of an ability to verify internal characteristics, and, in some cases, problems with transfer of ownership for a potentially radioactive specimen [5]- [6]. This leads to the lack of readily available samples of thick and heavily reinforced concrete for performing NDE, research, and training.…”

Section: Previous Concrete Failures In Npp Containment Structuresmentioning

confidence: 99%

“…Extending reactor life of the existing nuclear reactor fleet to 60 years and beyond will likely increase the susceptibility and severity of known forms of degradation, making materials issues a key concern [5] [6]. A multitude of concrete-based structures are typically part of a light water reactor (LWR) plant to provide foundation, support, shielding, and containment functions.…”

Section: Introductionmentioning

confidence: 99%

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Nondestructive Evaluation of Thick Concrete Using Advanced Signal Processing Techniques

Clayton

Barker

Santos-Villalobos

et al. 2015

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Section: Need For Suitable Concrete Specimensmentioning

confidence: 99%

Section: Previous Concrete Failures In Npp Containment Structuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nondestructive Evaluation of Thick Concrete Using Advanced Signal Processing Techniques

Clayton

Barker

Santos-Villalobos

et al. 2015

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“…The weight of the specimen is a major factor in this regard, where reinforced concrete is typically 150 lb/ft 3 and 162 lb/ft 3 assuming a NPP 5% steel by volume ratio. 5 This can be restrictive for the use of a typical structural laboratory crane having a 20 ton (40,000 lb) load capacity. There can also be restrictions due to the large specimen dimensions even if the specimen is cast in the location and orientation necessary to conduct the testing.…”

Section: Thick Specimen Concernsmentioning

confidence: 99%

Improving synthetic aperture focusing technique for thick concrete specimens via frequency banding

Clayton

2016

SPIE Proceedings

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A multitude of concrete-based structures are typically part of a light water reactor (LWR) plant to provide the foundation, support, shielding, and containment functions. This use has made its long-term performance crucial for the safe operation of commercial nuclear power plants (NPPs). Extending reactor life to 60 years and beyond will likely increase susceptibility and severity of known forms of degradation. While standard Synthetic Aperture Focusing Technique (SAFT) is adequate for many defects with shallow concrete cover, some defects located under deep concrete cover are not easily identified using the standard SAFT. For many defects, particularly defects under deep cover, the use of frequency banded SAFT improves the detectability over standard SAFT. In addition to the improved detectability, the frequency banded SAFT also provides improved scan depth resolution that can be important in determining the suitability of a particular structure to perform its designed safety function. Specially designed and fabricated test specimens can provide realistic flaws that are similar to actual flaws in terms of how they interact with a particular NDE technique. Because conditions in the laboratory are controlled, the number of unknown variables can be decreased, making it possible to focus on specific aspects, investigate them in detail, and gain further information on the capabilities and limitations of each method. To validate the advantages of frequency banded SAFT on thick concrete, a 2.134 m x 2.134 m x 1.016 m concrete test specimen with twenty deliberately embedded defects was fabricated.

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“…ORNL comparatively evaluated a number of ultrasonic techniques on concrete, using some concrete specimens previously identified in the ORNL report Summary of Large Concrete Samples, ORNL/TM-2013/223 [2]. Since no concrete specimens identified in this report are truly representative of the reinforced concrete sections found in NPPs, it was decided to utilize two 6.5 ft × 5.0 ft × 10 in.…”

Section: Overviewmentioning

confidence: 99%