A5073840587- Concrete Corrosion and Durability
- Concrete and Cement Materials Research
- Geophysical Methods and Applications
- Structural Health Monitoring Techniques
- Innovative concrete reinforcement materials
- Civil and Structural Engineering Research
- Ultrasonics and Acoustic Wave Propagation
- Geotechnical Engineering and Underground Structures
- Concrete Properties and Behavior
- Infrastructure Maintenance and Monitoring
- Rock Mechanics and Modeling
- Structural Behavior of Reinforced Concrete
- Structural Engineering and Materials Analysis
- Building materials and conservation
- Tunneling and Rock Mechanics
- Fire effects on concrete materials
- Smart Materials for Construction
- Structural Integrity and Reliability Analysis
- Mechanical stress and fatigue analysis
- Advanced Fiber Optic Sensors
- Non-Destructive Testing Techniques
- Conservation Techniques and Studies
- Fluid Dynamics and Turbulent Flows
- Structural Load-Bearing Analysis
- Engineering and Material Science Research
Federal Institute For Materials Research and Testing
2015-2024
Helmholtz Association of German Research Centres
2023
Technische Universität Berlin
2001-2004
The durability of prestressed concrete structures built between the 1950s and 1980s is becoming a growing problem. One reason sensitivity to stress corrosion cracking prestressing steel. Failure wires can result in collapse entire structure without premature indication by transverse bending cracks or considerable deformation. response significant number wire breaks was studied on bridge Brandenburg, Germany. Two thirds concentrated tendons two girders were cut before demolished. Acoustic...
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 fatigue process of concrete under compressive cyclic loading is still not completely explored. corresponding damage processes within the material structure are especially entirely investigated. application acoustic measurement methods enables a better insight into in concrete. Normal strength was investigated with regard to by using combination other nondestructive methods. Acoustic emission and ultrasonic signal measurements were applied together strains, elastic modulus, static...
This article describes advancements in the ongoing digital transformation materials science and engineering. It is driven by domain‐specific successes development of specialized data spaces. There an evident increasing need for standardization across various subdomains to support exchange entities. The MaterialDigital Initiative, funded German Federal Ministry Education Research, takes on a key role this context, fostering collaborative efforts establish unified space. implementation...
Abstract The bond between polymer fibers and the surrounding cementitious matrix is essential for development of concrete reinforcement. single fiber pull‐out test (SFPT) standard characterization technique testing strength. However, different phases debonding cannot be distinguished by SFPT. This study investigates from with a modified SFPT proposes methods to change setup generate more valuable information on mechanism. was equipped linear variable differential transformers (LVDT), digital...
The susceptibility of concrete structures due to alkali–silica reaction (ASR) can be assessed by means ASR prism testing at 60 °C, according RILEM AAR 4.1. There, expansion prisms indicates alkali-reactivity the examined mix. This work applies in situ measurement accelerated testing. Automated measuring facilitates both storage without usually necessary interruptions for manual and acquisition quasi-continuous data. A comparative experimental programme showed that conventional resulted...
Two test series were examined using nondestructive measuring methods by six independent laboratories before determining their compressive strength. The used the rebound hammer and ultrasonic pulse velocity measurement. types of geometries investigated: drilled cores cubes. measurement procedure for each these datasets is conditioned to geometry therefore different. first consists 20 (approximately diameter/height = 10 cm/20 cm) from 55-year-old Lahntal Viaduct near Limburg, Germany. After...
The article at hand presents an investigation on crack development in three different types of strain-hardening cement-based composites (SHCC) subjected to uni-axial tensile loading.The aim the work was evaluate applicability acoustic emission (AE) measurements for determining progressive damage within material, as well differentiating individual events by their origin and decisive mechanisms, such matrix cracking, fiber pullout or rupture.The method proved be fully appropriate recording...
Abstract Zur Beurteilung der Alkaliempfindlichkeit Gesteinskörnung finden normativ Betonversuch mit Nebelkammerlagerung bei 40 °C und alternativ 60 °C‐Betonversuch Anwendung. Als Beurteilungskriterium für den Schädigungsprozess wird beiden Verfahren die an Betonprismen diskontinuierlich ermittelte Dehnung herangezogen. Auch zusätzlich in Nebelkammer gelagerten Würfeln beschränkt sich Schadensanalyse auf eine diskontinuierliche Verfolgung maximalen Breite Oberflächenrisse. Im Rahmen des...
Over the last decades concrete has evolved from a simple mass construction material towards sophisticated multi-component system. The design parameters for mixture composition of have significantly increased strength based overall or specific performance based. As result variety yielding number special technologies such as Self-Compacting Concrete (SCC), High-Performance (HPC), Strain Hardening Cement Based Composites (SHCC), and many others. Due to their complex compositions multitude...
Abstract Bending beams and slabs are typical examples for structural elements used reinforced concrete structures such as bridge girders, T-beams decks. Their strength related failure modes at maximum loading can be divided into bending shear failure. The of loaded in occur with or without indication. Therefore, conventional design concepts aim on sufficient indication (e.g. large deflections cracks), it occurs the case secondary flexural compression These indicating factors also Structural...
Alkali–silica reaction (ASR) is a chemical within concrete which can lead over time to cracking and spalling. Due the complexity of problem, it still causes damage constructions worldwide. The study aims illustrate interdisciplinary research German Federal Institute for Materials Research Testing (BAM) last 20 years, considering all aspects ASR topics from macro‐ micro‐level. First, methods characterization assessment risks products used at BAM are explained classified in international...
Abstract Im Dezember 2019 wurden bei einer turnusmäßigen Inspektion der B 1‐Brücke am Altstädter Bahnhof in Brandenburg an Havel massive und schnell voranschreitende Schäden festgestellt. Als Ursache für die Risse entlang Längsträger wurde das Versagen eines signifikanten Anteils Spanndrähte konzentrierten Spannglieder vermutet. Die Brücke umgehend den Verkehr gesperrt im Mai 2021 gesprengt. Vorfeld Sprengung durch Bundesministerium Digitales (BMDV) weiterführende Untersuchungen zum...
The present study documents the results of an inter-disciplinary model project that was planned with aim developing innovative winter covering system for marble statuaries located on Schlossbrücke (Berlin). Such a would need to fulfil various requirements structural stability, aesthetics, climate and practical use. This applied research represents first complex scientific sustainability system. is characterised by use instruments such as special laboratory analysis numerical simulation...
Abstract Joint sealants influence decisively the performance and service life of pavements although they account for only a small fraction total investment. Motivated by damages observed resulting, increasing maintenance efforts, Federal German Government recognizes need performance-evaluated joint sealing systems with improved capability (fitness-for-purpose) durability. A literature study showed that an identification actual mechanical system behavior under realistic loads as well...