Die Ultraschall‐Echomethode – von der Messung zur bautechnischen Kenngröße

Maack, Stefan; Küttenbaum, Stefan; Epple, Niklas; Aligholizadeh, Mohammad

doi:10.1002/best.202000091

Cited by 7 publications

(3 citation statements)

References 10 publications

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“…Figure 1: A) Schematic representation of various test scenarios for impulse echo methods (dotted line -path of the impulse, red lineimpulse shape after a certain propagation time); extracted from [14], translated; B) Typical result of a radar measurement with the aim to detect rebars inside a bridge girder in a depth of 3 cm to 5 cm behind the lateral web surface…”

Section: Non-destructive Concrete Testingmentioning

confidence: 99%

Ways to unlock the potential of non-destructive concrete testing for the reliability assessment of our built environment

Küttenbaum

Maack

Aßmann

et al. 2023

8th International Workshop on Reliability of NDT/NDE

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Sustainability efforts and global climate targets coincide with degradation of the built environment. Changes in use, increasing loads, and—especially in transport infrastructure— sharply rising traffic flows are encountering an infrastructure that has largely reached or exceeded its service life. During the entire lifecycle of structures and materials, the engineer needs to decide which action(s) are optimal, e.g., most eco-efficient at what time. This decision-making process is based on the reassessment of the structure or network, which depends substantially on the information available about the system. It is well known that available and continuously further developed NDT methods allow the collection of manifold information highly relevant in structural assessment. However, the condition (i.e., the quality) of the information measured on-site and the reliability of inspection systems need to be known before NDT results can be used in such safety-relevant calculations. This contribution attempts to shed light on the application of POD analyses and measurement uncertainty calculations in nondestructive testing of concrete structures to provide useful and quality-assured information for reliability assessments of our built environment—with an emphasis on ground penetrating radar. It is shown that signal processing techniques affect POD analysis results to varying degrees, that measurement uncertainties are useful to validate PODs, and that the utilization of both POD analysis and measurement uncertainty calculations can pave the way to NDT-based reliability assessment, which will be exemplarily demonstrated in conclusion—generally aiming to derive those maintenance strategies and actions that are in line with actual demands.

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Section: Non-destructive Concrete Testingmentioning

confidence: 99%

Ways to unlock the potential of non-destructive concrete testing for the reliability assessment of our built environment

Küttenbaum

Maack

Aßmann

et al. 2023

8th International Workshop on Reliability of NDT/NDE

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“…Figure 4 Principle of echo measurements; extracted from [14] In addition to the characterization of material properties, it is frequently necessary to supplement existing plans or, if these are not available, to reconstruct them completely. The related testing tasks range from the determination, whether structural elements such as reinforcement bars were mounted as planned, to the geometrically precise reconstruction of tendon courses.…”

Section: Measurability Of the Relevant Parametersmentioning

confidence: 99%

Guideline on NDT‐supported reliability assessment of existing structures ‐ Current developments in Germany

Küttenbaum,

Braml,

Heinze

et al. 2023

ce papers

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Information about an existing structure can be collected at certain costs to evaluate the reliability and condition as realistically as necessary. This information can be relevant or irrelevant, true or biased, precise or imprecise. The incorporation of relevant and quality‐assessed measured information into reliability reassessment offers the chance to extend remaining lifetimes and support decision making about optimal actions or maintenance strategies. This paper shows recent developments in a national research project that aims to produce a guideline on the NDT‐based, structure‐specific modification of partial safety factors. The general methodology, results from recalculations according to the Eurocodes and metrologically solvable testing tasks relevant in the recalculation of the concrete bridges are shown and compared with the non‐destructive testing methods applicable to concrete bridges. A case study is used to demonstrate that as‐built drawings, in this case of the positions of tendons and shear reinforcement, can be verified using the radar method.

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“…The delay 𝑇 𝑉 depends mostly on the used equipment and can be measured comprehensively under laboratory condition. Reference specimens made of polyamide [30] and concrete were used to obtain the differences in time between backwall echoes and corresponding multiple reflections for different reference points such as the maximum of the signal envelope. The uncertainty of the bias (𝑡 ̂𝑣 = 27 83 𝜇𝑠) is 𝑢(𝑡 ̂𝑉) = 0 33 𝜇𝑠 and therewith not decisive in measurement uncertainty calculation due to the large sample size with 1.938 time stamps picked for the backwall and 1.392 picked for the first multiple reflection which, together with simulation results, also justifies the choice of the normal distribution [11].…”

Section: Individual Quantification Of Input Quantitiesmentioning

confidence: 99%

Approach to the development of a model to quantify the quality of tendon localization in concrete using ultrasound

Küttenbaum

Maack²,

Taffe³

2022

MATEC Web Conf.

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Each engineering decision is based on a number of more or less accurate information. In assessment of existing structures, additional relevant information collected with on-site inspections facilitate better decisions. However, observed data basically represents the physical characteristic of interest with an uncertainty. This uncertainty is a measure of the inspection quality and can be quantified by expressing the measurement uncertainty. The internationally accepted rules for calculating measurement uncertainty are well established and can be applied straightforwardly in many practical cases. Nevertheless, the calculations require the occasionally time-consuming development of an individually suitable measurement model. This contribution attempts to emphasize proposals for modelling the non-destructive depth measurement of tendons in concrete using the ultrasonic echo technique. The proposed model can serve as guideline for the determination of the quality of the measured information in future comparable inspection scenarios.

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Die Ultraschall‐Echomethode – von der Messung zur bautechnischen Kenngröße

Cited by 7 publications

References 10 publications

Ways to unlock the potential of non-destructive concrete testing for the reliability assessment of our built environment

Ways to unlock the potential of non-destructive concrete testing for the reliability assessment of our built environment

Guideline on NDT‐supported reliability assessment of existing structures ‐ Current developments in Germany

Approach to the development of a model to quantify the quality of tendon localization in concrete using ultrasound

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