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A platform for research: civil engineering, architecture and urbanism
Concrete hardening and moisture distribution in sandstones monitored by one-sided 1H-nuclear magnetic resonance
The nuclear magnetic resonance (NMR) phenomenon has been well known to physicists since the early fifties. Practical applications of this technique can nowadays be found in branches like medical imaging, protein analysis etc. However, conventional NMR measuring devices cannot be used for in-situ industrial application. This disadvantage is mainly due to the need for sample extraction required by these enclosing systems, but also to their large size and their fragility. Thanks to its light-weighted and rugged design, the one-sided access 1H-NMR device, which was recently developed at IZFP, offers the ability of being used in an industrial context. The aim of this paper is to show the suitability of this new concept for an almost unlimited number of applications in civil engineering. The results obtained in the last years and presented in this paper set the focus on two essential domains in common civil engineering, namely quality control during construction, where NMR was used e.g. in order to monitor the hardening degree of different fresh concrete samples and preventive diagnostic, e.g. recording of moisture depth profiles of sandstones commonly used in monuments considered as a part of our cultural heritage. The examples presented in this paper demonstrate the versatility and the suitability, but also the limits of One-Sided Access Nuclear Magnetic Resonance in civil engineering. In future, the focus will be set on further applications on this area. Measurements will for example be performed on steel beam reinforced concretes or low water-content concretes (w/c < 0.3). Furthermore, the influence of modern additives such as plasticizers, accelerators or sealers will be systematically examined with OSA-NMR.
Concrete hardening and moisture distribution in sandstones monitored by one-sided 1H-nuclear magnetic resonance
The nuclear magnetic resonance (NMR) phenomenon has been well known to physicists since the early fifties. Practical applications of this technique can nowadays be found in branches like medical imaging, protein analysis etc. However, conventional NMR measuring devices cannot be used for in-situ industrial application. This disadvantage is mainly due to the need for sample extraction required by these enclosing systems, but also to their large size and their fragility. Thanks to its light-weighted and rugged design, the one-sided access 1H-NMR device, which was recently developed at IZFP, offers the ability of being used in an industrial context. The aim of this paper is to show the suitability of this new concept for an almost unlimited number of applications in civil engineering. The results obtained in the last years and presented in this paper set the focus on two essential domains in common civil engineering, namely quality control during construction, where NMR was used e.g. in order to monitor the hardening degree of different fresh concrete samples and preventive diagnostic, e.g. recording of moisture depth profiles of sandstones commonly used in monuments considered as a part of our cultural heritage. The examples presented in this paper demonstrate the versatility and the suitability, but also the limits of One-Sided Access Nuclear Magnetic Resonance in civil engineering. In future, the focus will be set on further applications on this area. Measurements will for example be performed on steel beam reinforced concretes or low water-content concretes (w/c < 0.3). Furthermore, the influence of modern additives such as plasticizers, accelerators or sealers will be systematically examined with OSA-NMR.
Concrete hardening and moisture distribution in sandstones monitored by one-sided 1H-nuclear magnetic resonance
Betonhärtung und Feuchtigkeitsverteilung in Sandstein mittels einseitig angewendeter kernmagnetischer Wasserstoff-Resonanz
Kohl, F. (author) / Wolter, B. (author) / Knapp, F. (author)
2003
8 Seiten, 6 Bilder, 2 Tabellen, 2 Quellen
(Nicht paginiert)
Conference paper
Storage medium
English
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