A5088449231- Geophysical Methods and Applications
- Ultrasonics and Acoustic Wave Propagation
- Seismic Waves and Analysis
- Structural Health Monitoring Techniques
- Seismic Imaging and Inversion Techniques
- Concrete Corrosion and Durability
- Non-Destructive Testing Techniques
- Civil and Structural Engineering Research
- Geophysical and Geoelectrical Methods
- Geotechnical Engineering and Underground Structures
- Advanced Fiber Optic Sensors
- Diverse Legal and Medical Studies
- Drilling and Well Engineering
- Geophysics and Sensor Technology
- Digitalization, Law, and Regulation
- Structural Engineering and Materials Analysis
- Geotechnical Engineering and Soil Mechanics
- Law and Political Science
- Rock Mechanics and Modeling
- Grouting, Rheology, and Soil Mechanics
- Infrastructure Maintenance and Monitoring
- Smart Materials for Construction
- Thermography and Photoacoustic Techniques
- Graphite, nuclear technology, radiation studies
- Seismology and Earthquake Studies
Federal Institute For Materials Research and Testing
2016-2025
Bouygues (France)
2023
WSP (Finland)
2023
Wrocław University of Science and Technology
2023
Cowi (Denmark)
2023
Network Rail
2023
AGH University of Krakow
2023
Helmholtz Association of German Research Centres
2023
Deutsche Nationalbibliothek
2020
Bluegrass Advanced Materials (United States)
2015
ABSTRACT Over the last 15 years significant advancements in induced polarization (IP) research have taken place, particularly with respect to spectral IP (SIP), concerning understanding of mechanisms phenomenon, conduction accurate and broadband laboratory measurements, modelling inversion data for imaging purposes increasing application method near‐surface investigations. We summarize here current state science SIP applications describe which aspects still represent open issues should be...
Coda wave interferometry is a recent analysis method now widely used in seismology. It uses the increased sensitivity of multiply scattered elastic waves with long travel-times for monitoring weak changes medium. While its application structural has been shown to work under laboratory conditions, usability on real structure known material had yet be proven. This article presents experiments concrete bridge during construction. The results show that small velocity perturbations induced by...
Ultrasonic transmission measurements have been used for decades to monitor concrete elements, mostly on a laboratory scale. Recently, coda wave interferometry (CWI), technique adapted from seismology, was introduced civil engineering experiments. It can be reveal subtle changes in samples and even large structural elements without having transducer directly at the place where change is taking place. Here, several load tests until failure posttensioned beams monitored using networks of...
Recently developed new transducers for ultrasonic transmission, which can be embedded right into concrete, are now used non-destructive permanent monitoring of concrete. They installed during construction or thereafter. Large volumes concrete monitored changes material properties by a limited number transducers. The transducer design, the main as well installation procedures presented. It is shown that compressional waves with central frequency 62 kHz mainly generated around transducer's...
The assessment of Coda Wave Interferometry (CWI) and Distributed Fiber Optics Sensing (DFOS) techniques for the detection damages in a laboratory size reinforced concrete beam is presented this paper. sensitivity these two novel to micro cracks discussed compared standard traditional sensors. Moreover, capacity DFOS technique localize quantify crack openings also assessed. results show that implementation CWI allow early subtle changes structures until formation. With their ability opening,...
Abstract Data science (digitalisation and artificial intelligence) became more than an important facilitator for many domains in fundamental applied sciences as well industry is disrupting the way of research already to a large extent. Originally, data were viewed be well-suited, especially, data-intensive applications such image processing, pattern recognition, etc. In recent past, particularly, data-driven physics-inspired machine learning methods have been developed extent that they...
This article presents a novel assessment framework to identify the health condition of wood utility poles. The innovative approach is based on integration data mining and machine learning methods combines advanced signal processing, multi-sensor fusion decision ensembles classify different damage types In proposed framework, wavelet packet analysis employed transform captured multi-channel stress wave signals into energy information, which consequently compressed by principal component...
Abstract This paper summarizes current developments and outlines essential teaching content in the field of non‐destructive testing civil engineering for academic education at German‐speaking universities. first memorandum on research (NDT‐CE) universities provides an overview identifies focal points important topics NDT‐CE research. Suggestions are given development advancement curricula with regard to a comprehensive sound professional students related disciplines. In terms form,...
Ultrasonic imaging methods are widely used in non-destructive testing (NDT) and structural health monitoring (SHM) to ensure the safety of critical infrastructure. This work focuses on a methodology that combines Full Waveform Inversion (FWI) Reverse Time Migration (RTM) techniques improve ultrasonic data analysis complex concrete structures. approach allows deeper understanding internal properties heterogeneities within materials. The European project I am involved in, "USES novel...
Ultrasonic echo testing is a more and frequently used technique in civil engineering to investigate concrete building elements, measure thickness as well locate characterise built-in components or inhomogeneities. Currently the Synthetic Aperture Focusing Technique (SAFT), which closely related Kirchhoff migration, most cases for imaging. However, this method known have difficulties image steeply dipping interfaces lower boundaries of tubes, voids similar objects. We transferred processing...
Abstract This paper reviews state-of-the-art in nondestructive testing (NDT) and semidestructive (SDT) methods applicable for imaging the condition of structural timber. Both NDT SDT reveal defects, damages, decay, while extent wood decay can also be quantified. Combined with an appropriate data interpretation concerning internal mechanical properties material assessed. The possibilities limitations most relevant individual methods, combination each other, are outlined compared. To...
The enlargement of the cracks outside permitted dimension is one main causes for reduction service life Reinforced Concrete (RC) structures. Cracks can develop due to many such as dynamic or static load. When tensile stress exceeds strength RC, appear. Traditional techniques have limitations in early stage damage detection and localisation, especially on large-scale ultrasonic Coda Wave Interferometry (CWI) method using diffuse waves most promising methods detect subtle changes heterogeneous...
Abstract The corner echo is a well-known effect in ultrasonic testing, which allows detection of surface breaking cracks with predominantly perpendicular orientation to the as, for example, corrosion metal pipes or shafts. This formed by two planes, crack and breaks. It can also be classified as half-skip method, since reflection pulse occurs on backwall before at defect takes place. In combination diffraction from tip, sizing. As shown this paper, used civil engineering nondestructive...
After some river embankment failures during recent floods in Germany, major investigation and improvement programs for embankments have been implemented. Presently, the mainly relies on existing documentation, visual inspection, drilling sampling. Geophysical techniques, which are applied non-destructively from surface, potential to cover gaps between sampling points enhance reliability of subsurface information. This paper describes evaluation results resistivity, electromagnetic, seismic...
This article presents a unique method of installing special type embedded ultrasonic transducers inside 36-m-long section an old bridge in Germany. A small-scale load test was carried out by 16 ton truck to study the temperature and influence on bridge, as well performance transducers. Ultrasonic coda wave interferometry technique, which has high sensitivity detecting subtle changes heterogeneous medium, used for data evaluation interpretation. The separation two main factors (load effect...
A European Integrated Research Project has recently been started within the 6th Framework Program of Commission. The project aims at improved methods for upgrading existing railway bridges network. main objectives are to increase transport capacity by allowing higher axle loads and increasing maximum speeds. Other residual lifetime enhance management, strengthening repair systems. overall goal is enable delivery without compromising safety economy working railway. consortium consisting...
Ultrasonic methods are valuable tools for quality assessment and structural imaging of concrete. In such applications, accurate reliable determination ultrasonic wave velocities is essential, as they affected by various experimental environmental factors. this research coda interferometry (CWI) was used to determine the influence temperature (0 50 °C) on velocity in concrete samples. A resolution better than 10−4 achieved measurement relative changes. Reversibility repeatability well...
Crosshole sonic logging (CSL) can be used to determine the quality of joints in a diaphragm wall. Tests conducted on laboratory models have provided reference information for interpretation field data. During two large construction projects, CSL has been implemented control walls. The experiences shown benefits tests and predictive value measurements.
This paper presents a novel non-destructive testing and health monitoring system using network of tactile transducers accelerometers for the condition assessment damage classification foundation piles utility poles. While in traditional pile integrity an impact hammer with broadband frequency excitation is typically used, proposed utilizes innovative based on to induce controlled narrow-band stress waves. Thereby, simultaneous multiple wave types modes avoided (or at least reduced), targeted...
The European infrastructure asset has developed historically and is characterized by nation-specific construction processes. Inspection, condition assessment, maintenance procedures differ from country to country. Because of historical political circumstances, national assets are maintained at different levels, too. Since the budget for maintaining bridge less meets demands a growing stock, inspection, maintenance, life-cycle considerations gain higher importance. need exists develop...
Complex special inspection of an old masonry arch bridge according to the Guideline on Inspection and Condition Assessment Railway Bridges numerical analysis structure are presented. The guideline summarises recommendations for step-by-step investigation railway bridges applying enhanced methods developed during EU-funded project Sustainable Bridges. For barrel, ballast parameters inner backfill behind barrel a number various advanced non-destructive minor-destructive testing were applied....