Localization of grouting faults in post tensioned concrete structures

Krause, Martín

doi:10.1007/978-94-007-2736-6_6

Cited by 7 publications

(4 citation statements)

References 23 publications

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“…Ultrasonic methods [30] are based on mechanical waves in the frequency range above 20 kHz. Ultrasonics can be used in transmission [31] or reflection mode [32]. Transmission mode is used mainly for the evaluation of material properties and based on the analysis of variations in the signal velocity and the damping of the signal within the object.…”

Section: Ultrasonicsmentioning

confidence: 99%

Non-Destructive Testing of Dalle de Verre Windows by Fernand Léger and Alexandre Cingria in Switzerland

Hugenschmidt,

Wolf,

Gosselin

2023

Heritage

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Dalle de verre windows consist of thick slabs of coloured glass set in a matrix of reinforced concrete. The invention of this special art form is closely linked to the developments in modern architecture in the first half of the 20th century that are characterized by using new technologies such as steel-frame construction, reinforced concrete and the increasing use of glass. Many of these windows are showing damage, some of it severe. Until now, the causes of damage have hardly been investigated and there is still no practical and suitable approach to the analysis of the state of conservation of dalle de verre glazings. One of the main objectives of an interdisciplinary project (2019–2021) was therefore to evaluate the potential of non-destructive techniques for the characterisation of and identification of damage of dalle the verre windows in their structural, physical and climatic context. Various non-destructive methods (Ground-Penetrating Radar, Electric resistivity, Half-cell potential, Ultrasonics, Induction, Magnet and Thermography) have been tested on two prominent dalle de verre examples: the windows created by Fernand Léger for the church of Saint-Germain d’Auxerre in Courfaivre (Swiss Jura mountains) and the large tripartite by Alexandre Cingria once decorating the choir window church of the Franciscan monastery at Fribourg, Switzerland. The results of the analyses presented in this paper provide valuable information on the advantages and limitations as well as the costs of the methods used.

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Section: Ultrasonicsmentioning

confidence: 99%

Non-Destructive Testing of Dalle de Verre Windows by Fernand Léger and Alexandre Cingria in Switzerland

Hugenschmidt,

Wolf,

Gosselin

2023

Heritage

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“…Locating tendon ducts and the identification of the condition of the grout materials is possible within certain limits [4]. Depending on the accessibility (one-sided, double sided or from the edge) different methods or combinations of methods can be applied in a range between 0,1 -2,0m.…”

Section: Locating Tendon Ducts and Identification Of The Condition Ofmentioning

confidence: 99%

NDE of Thick and Highly Reinforced Concrete Structures: State of the Art

Wiggenhauser

Naus

2014

Procedia Engineering

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The objective of the report is to present the state-of-the art of non-destructive testing methods and technologies for the inspection of thick, heavily-reinforced structures, (e.g. found in nuclear power plants). Wall thicknesses can be in excess of one meter and the structures often have increased steel reinforcement density. The accessibility for any testing method may be limited due to the presence of liners and other components such as cast-in-place items. Testing methods have to provide solutions for tasks such as locating failure (inclusions, corrosion, voids, delaminations) in the structures or the assessment of the condition of the structure in general.

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“…New sensors and data processing techniques have led to many new applications in quality assurance, structural investigation, and health monitoring. The state of the art is described, e.g., in Schickert and Krause (2010), Krause (), and Niederleithinger et al (). The main targets in ultrasonic concrete inspection are thickness measurements, geometry determination, localisation and characterisation of tendon ducts, and detection of quality issues (honeycombing, cracks, and low concrete strength).…”

Section: Introductionmentioning

confidence: 99%

Reverse time migration: introducing a new imaging technique for ultrasonic measurements in civil engineering

Grohmann

Müller

Niederleithinger

et al. 2017

Near Surface Geophysics

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Ultrasonic echo testing is widely used in non-destructive testing in civil engineering to investigate concrete structures, to measure thickness, and to locate and characterise built-in components or inhomogeneities. Currently, synthetic aperture focusing techniques are mostly used for imaging. These algorithms are highly developed but have some limitations. For example, it is not possible to image the lower boundary of built-in components like tendon ducts or vertical reflectors. We adopted reverse time migration for non-destructive testing in civil engineering in order to improve the imaging of complicated structures in concrete. By using the entire wavefield, including waves reflected more than once, there are fewer limitations compared to synthetic aperture focusing technique algorithms. As a drawback, the required computation is significantly higher than that for the techniques currently used.Simulations for polyamide and concrete structures showed the potential for non-destructive testing. The simulations were followed by experiments at a polyamide specimen. Here, having acquired almost noise-free measurement data to test the algorithm, we were able to determine the shape and size of boreholes with sufficient accuracy. After these successful tests, we performed experiments at a reinforced concrete foundation slab. We obtained information from the data by reverse time migration, which was not accessible by traditional imaging. The imaging of the location and structure of the lower boundary of the concrete foundation slab was improved. Furthermore, vertical reflectors inside the slab were imaged clearly, and more flaws were found. It has been shown that reverse time migration is a step forward in ultrasonic testing in civil engineering.

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Localization of grouting faults in post tensioned concrete structures

Cited by 7 publications

References 23 publications

Non-Destructive Testing of Dalle de Verre Windows by Fernand Léger and Alexandre Cingria in Switzerland

Non-Destructive Testing of Dalle de Verre Windows by Fernand Léger and Alexandre Cingria in Switzerland

NDE of Thick and Highly Reinforced Concrete Structures: State of the Art

Reverse time migration: introducing a new imaging technique for ultrasonic measurements in civil engineering

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