Plenary Meeting, Bochum
21. - 22. March 2024
From 21st to 22nd of March the CoDA group met in Bochum for the 10th plenary meeting. Within the meeting the group recieved the regular status update from each subproject. Further time was allocated for discussions concrening interaction between subprojects, and future plans within a World Café format. In addition, the doctoral candidates were given the opportunity to present their PhD project to the group.
CoDA Special Session IALCCE2023, Mailand
05. July 2023
The CoDA research group organized a Special Session Concrete Damage Assessment using CODA Waves at IALCCE2023 (Eighth International Symposium on Life-Cycle Civil Engineering) in Milan. During the Special Sesson on Wednesday, 05 July 2023 the presented contributions covered the entire spectrum of the CoDA research unit.
The presented results were published within the conference proceedings: https://doi.org/10.1201/9781003323020
Plenary Meeting, Milan
02. July 2023
For the half-yearly plenary meeting, the CoDA group met in Milan on July 02. During the meeting, the subprojects presented recent results, as well as ongoing and planned investigations. A special focus was given to the collaboration between the projects and the exchange of ideas for future group activities.
New Project - Early-stage damage detection in concrete using coda signals and AI
27. June 2023
We are happy to announce that the project “Early-stage damage detection in concrete using coda signals and AI” has been approved for funding by the TUM Georg-Nemetschek Institute of Artificial Intelligence for the Build World.
We have received funding for two PhD positions for a period of 4 years starting from October 2023. The first PhD student will work on developing generative methods for characterizing coda signals and the second PhD student will work on material scale experimental design, data generation, analysis and applications. The Chair of Materials Science and Testing (Prof. Gehlen) is currently looking for suitable candidates. Both PhD students will be integrated into the Research Unit CoDA and will work in close collaboration with all sub-projects of the Research Unit CoDA.
Workshop, Berlin
06. - 08. February 2023
From 6 to 8 February 2023, the research associates of the research unit CoDA met for a workshop at BAM in Berlin. The meeting was the first opportunity for the project team to come together in the new constellation resulting from the successful departure of previous PhD students and the joining of new project members. The aim of the workshop was to recapitulate the work done and goals achieved in the first funding phase and subsequently to discuss the tasks and plans for the second funding phase across subprojects. A series of project-related lectures further strengthened the knowledge base and communication across the different research areas.
From left to right: Stefan Grabke (TUM2), Eva Jägle (TUM1), Martin Balcewicz (BU), Camila Sanchez (BAM), Noah Sträter (RUB2), Giao Vu (RUB1).
Summer School, Zugspitze
19. - 22. Juli 2022
Already for the second time, the research group CoDA came together for an intensive exchange within the framework of a Summer School. For the meeting from July 19 to 22, the research group, as well as guest speakers from Germany and abroad, traveled to the environmental research station Schneefernerhaus on the Zugspitze. Participation via online video conference also enabled participation in virtual form. In addition to status updates of the individual subprojects, the School focused in particular on the transition from the first to the second project phase. The common understanding of goals and tasks was deepened, new project members were introduced and the interaction of the subprojects was highlighted. The program was rounded off by a variety of presentations and a guided tour of the station, which is located at an altitude of 2650 meters.
Congratulations Felix Clauß!
15. June 2022
Felix Clauß, M. Sc. successfully defended his dissertation on "Thermo-Mechanical Investigations of Reinforced Concrete Structures Using Coda Wave Interferometry" on June 15, 2022. Members of the doctoral committee were:
Mr. Prof. Markus Knobloch (Ruhr-University Bochum)
Mr. Prof. Peter Mark (Ruhr-University Bochum)
Prof. Christoph Gehlen (Technical University of Munich)
Mr. Privatdozent Dr. Ernst Niederleithinger (German Federal Research Institute for Material Science and Testing)
In the second project phase, Felix Clauß will remain with us in a supervisory role for the RUB2 subproject.
Congratulations and the best of luck!
Extension of the Project Funding by the DFG
10. December 2021
The research unit Concrete Damage Assessment by Coda Waves (CoDA) is happy to announce the extension of the project funding by the German Research Foundation for another three years. After a successful completion of the first three-year long project phase, we will continue and deepen our collective work in the second phase.
DFG Project - Concrete Damage Assessment by Coda Waves (CoDA)
Paper selected as Editor's Choice Article
July 2021
A recent paper published in the journal Materials has been selected as an Editors Choice Article. The paper can be accessed in the following link: https://doi.org/10.3390/ma14143830
PhD Students‘ Workshop, Raitenhaslach
21. - 23. July 2021
During 21st to 23rd of July a PhD Students' Workshop of the research unit Coda took place at the TUM Science & Study Center Raitenhaslach. Research updates from all project partners where given in the form of presentations. In addition, time was used for planning of common publications and the data transfer to the project-intern data base. Furthermore, the interaction between experimental and simulation-based projects was strengthened.
Digital Conference - Simulation and Digital Twin, Munich
05. May 2021
On May 5th a joint digital conference of Siemens and TU Munich took place on the topic of “Simulation and Digital Twin”. With the Coda technology having a huge potential on structural health monitoring, the technology and first results on damage detection were presented to a broad audience. PD Dr. Roland Wüchner shared insights in his talks on “Simulation & Digital Twin – The enabler of cutting-edge products and services“.
Thermal Testing on a Large-Format Reinforced Concrete Beam, Bochum
October 2020
The influence of temperature changes in a component on the codasignal was investigated at the Ruhr University Bochum on a reinforced concrete beam of 3.5 m length with rectangular cross-section (w = 0.25 m x h = 0.5 m). Different temperature states (constant and linearly varying over the height) were investigated by established as well as novel temperature measurement techniques (thermocouples, infrared camera, fiber optics). Special attention was paid to the comparison of the measured temperature fields with ultrasonic attribute maps.
Summer School, Berchtesgaden
28 September - 02 October 2020
From 28th of September until 2nd of October 2020 the summer school of the research unit CoDA took place in the TUM Research Station Friedrich N. Schwarz near Berchtesgaden. To carry out the school in times of Covid-19 a hygiene concept, including reduced bed occupancy and mandatory face masks within the research station, was implemented. Some guest speakers poarticipated via online video conference. However, for the creative process and the project progress the presence of the students and project members was essential. Apart from an integrated project meeting with corresponding research updates of the individual subprojects guest lectures were held by german and international speakers on current research topics from academic background as welll as from industry.
Comparison of Different Methods for Temperature Induction in Reinforced Concrete Structures, Bochum
September 2020
In some experiments, water cooling, water heating, silicone heating mats, infrared radiators and a specially developed Peltier cooling system were investigated for their suitability for temperature induction in concrete structures. In addition to purely quantitative results, such as the maximum achievable temperature-time behavior, the factors of interaction between the component and the temperature control system, the temperature control, the temperature transition and the temperature control are mainly investigated.
Installation of ultrasonic sensors at the Gänstorbrücke, Ulm
21 - 25 SEPTEMBER 2020
Ten ultrasonic sensors were successfully installed in the tension member at the Gänstorbrücke in Ulm during the week of 21.09.2020-25.09.2020. By means of regular measurements with attached and embedded sensors, changes in the structural component are to be detected using coda wave interferometry. Thanks to the sensor technology already installed by the engineering office Schiessl Gehlen Sodeikat and the company Vallen Systems, the measurement results can be compared with common methods (acoustic emission, strain gauges) in case of suspicion. The research group hopes that this will provide further insights to improve damage detection and differentiation with coda waves on real components.
Furthermore, 20 sensors could be embedded in the middle of the bridge in the same week. This experiment is part of a project financed by the Federal Road Research Institute (BASt). The research group should also benefit from the evaluation of the data in the middle of the bridge.
Report of the Bayerischer Rundfunk
Plenary Meeting, Online-Meeting
26 - 27 March 2020
The research group's third plenary meeting, which was originally planned in Ulm, takes place in the form of a web conference. The results of the sub-projects and the respective project status are presented by the doctoral students. Other topics include the organization of a summer school, the coordination of joint publications and the planning of research stays together with the Mercator Fellow Eric Larose.
Large-Scale Experiment on Reinforced Concrete Beams in Four-Point Bending Test, Bochum
04. December 2019
On December 4th, 2019, a first construction element test was carried out at the Ruhr University Bochum using a reinforced concrete beam. The aim was to compare different measurement techniques (strain gages, fiber optics, digital image correlation) on a test object with regard to their performance and practical applicability and to determine the most suitable method for the project. The additional ultrasonic transducers placed in the test specimen allow for the comparison of measured strain fields with ultrasonic attribute maps from Coda wave interferometry.
Inspection Gänstor Bridge, Ulm
19 September and 07 - 08 October 2019
The framework for a possible instrumentation of an abutment of the Gänstor bridge were discussed in advance with the Department of Transportation Infrastructure of the City of Ulm, the structural engineering office, Konstruktionsgruppe Bauen AG, and with the Engineering Office Schiessl Gehlen Sodeikat GmbH, which takes responsibility for the already installed measurement technology. During a local meeting, radar and ultrasound measurements at the abutment are used as the basis for a measurement concept by means of the coda technology.
Plenary Meeting, Bochum
30 September - 02 October 2019
The status of the subprojects are discussed at the plenary meeting at the Institute of Concrete Structures at the Ruhr University Bochum. The results of the experiments at micro and structural levels as well as the approaches for the corresponding material models are presented and the further procedure for their coordination is examined. In addition, the instrumentation of a building, the Gänstor bridge in Ulm with already installed measuring technology in the form of acoustic emission, strain and temperature measurement, is determined. The meeting is complemented by a visit to the Bochum Jahrhunderthalle.
PhD Students‘ Workshop, Berlin
14 - 15 May 2019
The first doctoral workshop of the project takes place at the Federal Institute for Materials Testing in Berlin. The subgroups present the first results and agree on the programming language Python for the exchange of code. Guest speakers are the Mercator Fellow of the research group Dr. Eric Larose giving a talk on Coda Wave Imaging, Dr. Christoph Völker on data fusion and PhD Sascha Liehr on fiber optics and neural networks.
Excursion Centre for Building Materials, Munich
29 - 30 April 2019
The research unit visits the Center for Building Materials and Materials Testing at the Technical University of Munich and becomes familiar with the laboratories and equipment of the working groups concrete technology, chemistry, binders and additives as well as non-destructive testing. The concreting process with embedding of ultrasound, temperature and humidity sensors Sensors is demonstrated on the basis of a specimen batch. The group defines the transfer process measurement data to the database.
Kickoff CoDA DFG Research Unit 2825, Bochum
14 January 2019
The DFG funded research unit CoDA, Concrete Damage Assessment by Coda Waves, meets for the kickoff of the project in Bochum. The groups present the work packages of the individual subprojects as well as the coordination project in detail, discuss the schedules and agree on the concept of data organization in an SQL database between the subprojects.. Furthermore, the newly hired employees introduce themselves.
